That translates into consistent shock performance and feel despite the ambient and operating conditions. Using a lighter grade than recommended may result in excessive mechanical wear and reduced engine life. Automotive expertise from NAPA AUTO PARTS. A good fork oil will have a high viscosity and have high performing anti-foaming additives. It wouldn’t make much sense to rate engine oil flow at room temperature — after all, it gets really, really hot inside your engine, and that’s where it’s crucial that oil flows as efficiently as possible for a given engine’s design requirements. What fluid would provide the best shock consistency? Personally I stick to the stock weight but I also ride slower on dirt than your average nine year old, and then only on nice graded dirt roads. The faster the wheel moves vertically, the more oil is shoved through the holes. Sometimes, viscosity is also referred to as an oil’s “weight,” with a heavier oil featuring a higher viscosity grade. Don't Panic! Fork oil is rated in a similar way to the SAE rating for engine oils, so the thinner the oil, the forks will move faster and the damping will be softer. Viscosity grades are similar. Then, after you’ve made a few laps and the vehicle’s heated up, the fork oil thins as it warms. The peg spanner is only applicable to models up to 09/1977. Having been bitten by the car bug at a young age, I spent my formative years surrounded by Studebakers at car shows across Quebec and the northeastern United States. Required fields are marked *. Heavy Duty Fork Oil Informational Chart . These trade off must be balanced against the gains that a specific adjustment makes to improve your suspension. Snow Chains vs Cables: Which Is Right for You? Understanding Oil Viscosity: What Do Those Numbers On The Bottle Mean? Motorex Racing Fork Oil now has '3D Response Technology'. engine oil, lubrication, motor oil, oil, oil viscosity, Pennzoil, synthetic oil, viscosity. The Society of Automotive Engineers (SAE) assigns a viscosity number, or weight, to oil based on its flow at 210 degrees F, which is roughly the … Answer me that, Mr. Dave Moss. Personal preference plays a big part with fork oil choice. Consistent dampening despite temperature changes. Reputable manufacturers publish product data bulletins for their shock oils and post them online. The shock oil is one of the biggest variables in your suspension tune, and messing with it can throw off suspension feel and your riding confidence. For example, an A is a 90-100, a B is an 80-89, etc. Think of molasses or honey. 5w30 engine oil has about the same viscosity as the heaviest fork oil labeled 20w20. New fork oils provide new suspension tuning technology. When you see an oil that’s rated SAE 30, this translates into an engine oil that has a viscosity between 9.3 cSt and 12.5 cSt at 212 degrees F. Sometimes it gets much colder than room temperature — particularly during the winter months when the thermometer can plunge well below freezing. If Your Car Battery Won't Hold a Charge, Try These 4 Steps, 6 Signs You May Have a Bad Water Pump On Your Hands, Dead Car Battery? I state that the adjustment process is a game because of the trade offs that must be made. TYPES OF RIDING The types of riding determine you expected setu… That W stands for “winter” and is a shorthand that tells you that you’re dealing with a multigrade oil that’s been tested to pump at extremely cold temperatures. Special Tool - Fork Oil Level Gauge: 57001-1290 [A] If the oil is above or below the specified level, remove or add oil and recheck the oil level. Fork oils are usually monogrades eg 10w or 5w. BTW, you can write an informative article about brake maintenance. Viscosity is the force required to shear (break) the oil at a certain speed and temperature. im changing the fork seals on my 07' yz 450. whats a good weight of oil to use? Oil viscosity is graded by measuring the time it takes for a standard amount of oil to flow. You might have noticed that there are far more bottles of oil with a “W” on the label than there are with just a single SAE number. High viscosity oils flow more slowly and come with a higher SAE number. When was the last time you had a thin or thick glass of water? Using a heavier grade than recommended may cause decrease in fuel economy, higher engine loads and eventually shortened engine life. A viscosity “grade” is just like a grade in school that denotes a range of numbers. Yes, water. Lower viscosity “0W” oils can also help provide better fuel economy, because it is easier for an engine to pump a thinner oil. If you like slower rebounds, use a heavier fluid. Page 176: Disassembly (Each Fork Leg) 11-10 SUSPENSION Front Fork NOTE Tighten the two clamp bolts alternately two times to en- sure even tightening torque. According to the Society of Tribologists and Lubrication Engineers (STLE), viscosity is one of an oils most important physical properties. The fluid’s rate of flow through the valves influences the amount of dampening and rebound. The quicker an oil flows, the lower its viscosity and the grade assigned to it by the Society of Automotive Engineers (SAE). ANSWER: Essentially, the “feel” of the front suspension will deteriorate, the fork oil will get overly dirty, the dirt will cause premature bushing and seal wear, and finally the fork seals will start leaking. Headlight Lens Replacement or Polish Kit? The SAE defines high temperature oil viscosity at 212 degrees Fahrenheit (which is 100 degrees Celsius), which is the baseline used to approximate the operating temperatures of most vehicles. Hence for that reason the front forks of the bike are filled with a highly viscous liquid, Fork Oil. If you prefer quick rebounds, use a lighter fluid. Here's What's Happening, BMR Announces 2021 Lineup with Love, Moore, Bill McAnally Racing Earns Tenth Series Title, Elliott Races to First NASCAR Cup Series Championship with Win at Phoenix, Sweet Crowned 2020 World of Outlaws Sprint Car Series Champion, Ron Capps Closes 2020 Season with Final-Round Appearance and Fourth-Place Ranking. Sure, if the viscosity of the shock oil never changes. November 2, 2016. Check out all the chemical products available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. Your email address will not be published. There are trade offs that can be given for each adjustment that you make to your bike. If you increase the weight, you’re using a higher viscosity. Within the industry it's common to use both oil and fluid in … This is an important point. Sorry, your blog cannot share posts by email. This is called “hydrodynamic lubrication” and crank bearings depend on it. As a general rule high viscosity oils are best for low speed, loaded gears with a rough surface. Hence, it would flow at the same rate through the shock valves, resulting in consistent feel. If corrosion starts, it won’t stop, spreading and depositing flakes of contaminant in the oil that act like sandpaper and scour metal parts until they’re worn out. In the simplest terms, viscosity refers to how well a lubricant flows at a given temperature. In contrast, a thick fluid flows more slowly and results in slower rebound and stiffer shock feel. It is the operating temperature viscosity that is most important. If you can’t find a data sheet for the oil you’re considering, think twice before using it. This all gets very complicated when you start looking beyond basic viscosities and get into oils with specific applications. You might have noticed that there are far more bottles of oil with a “W” on the label than there are with just a single SAE number. Oils work because they have viscosity; the drag of a rotating part pulls oil from a low-pressure area into a high pressure area and “floats” the surfaces apart. Once you have the proper suspension set-up for your body weight and riding style, stick with it. In the world of shocks, there are no universal viscosity requirements or recommendations. IS FORK OIL AN OIL OR A FLUID? A fork oil’s number-one task is to deliver consistency. i heard that i should use the heaviest oil that i can find. A higher VI indicates better resistance to viscosity changes throughout broad temperature swings. So... how much and why? Save my name, email, and website in this browser for the next time I comment. That’s why water theoretically would provide the most consistent shock feel. I believe that the key things to consider are the expected service (i.e. Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to email this to a friend (Opens in new window), product data bulletins for their shock oils, Your Complete Guide to 2021 King of the Hammers, 6 Overlooked Heavy-Equipment Maintenance Tips, iy_2021; im_01; id_27; ih_05; imh_06; i_epoch:1611752813842, py_2021; pm_01; pd_11; ph_10; pmh_31; p_epoch:1610389899812, link-block-publisher; link-block-publisher_link-block-publisher; bodystr, pn_tstr:Mon Jan 11 10:31:39 PST 2021; pn_epoch:1610389899812, https://blog.amsoil.com/what-to-know-when-choosing-shock-oil/. © Copyright National Automotive Parts Association. It also must protect against wear and corrosion, two tasks at which water is notoriously bad. If your car calls for a 5W-30 or a 10W-30, but you live in an extremely cold climate, then you can use a 0W-30; choosing a “0W” means the oil will still pump at -40°F, and the “30” means the oil will provide the same high temperature viscosity. This means that you will increase the rebound and compression damping at every click setting. Synthetic Amsoil ATF has viscosity between the Spectro 10w and 15w fork oils. The quicker an oil flows, the lower its viscosity and the grade assigned to it by the Society of Automotive Engineers (SAE). To make it simple, just pick up the oil type that’s recommended in your owner’s manual. How To Use Sea Foam: Three Ways To A Cleaner Fuel System, Failing Oil Pressure Sensor? That’s because fluids become thinner when they warm up. Later machines have a different arrangement at the top of the stanchions with a plastic push on cap replacing the chromed screw in cap that requires the peg spanner. It’s crucial that oil flows just as well when you first crank the ignition as it does when the vehicle is warmed up, otherwise there’s a risk of damaging internal components. So 10w40 engine oil should give 3x the damping of 10w fork oil. While silicone oil is recognized as the best for RC due to its ability to resist changes in viscosity due to temperature fluctuations, the labeling can be misleading. Low viscosity oils, on the other hand, … I currently contribute as an editor to several online and print automotive publications, and I also write and consult for the pharmaceutical and medical device industry. And remember  that viscosity measurement rules are the same whether you choose a normal conventional motor oil, or a high tech natural gas derived full synthetic motor oil like Pennzoil Platinum. Originally published: April 4, 2018. I just replaced my fork springs with Wilbers and they recommend 7.5wt fork oil. Higher vs. lower viscosity fork oil As you may have noted, Norton commando reference material(s) suggest several grades, viscosities, and types of oil may be used for the front forks. It’s logical to assume that a low viscosity oil is thinner than a high viscosity oil. Lower viscosity “0W” oils can also help provide better fuel economy, because it is easier for an engine to pump a thinner oil. The number preceding the W indicates the lubricant’s viscosity grade when operating at extremely cold temperatures. Instead, look for a fork oil with a high viscosity index (VI). The following sections of this article go into the dynamics of what happens when changes are made to the suspension. SAE 0W-20 is compatible with a SAE 5W-20). Post was not sent - check your email addresses! Here’s a really nerdy table that uses the much tighter Centistoke (Cst) testing scale, so we can compare brands with accuracy. But what do we really mean when we talk about an oils viscosity? A: Raising the oil level increases the compression ratio in the front fork and therefore changes the progressiveness of the spring forces. Say you’re riding your dirt bike and land a jump. Oil viscosity can feel a bit like math class when you’re standing inside your local auto parts store staring down row after row of oil bottles plastered with algebraic numbers and letters. This Simple Hack Lets You Shift to Neutral, How to Jump-Start a Diesel Truck With Two Batteries, How to Dry Out Your Wet Car in 3 Easy Steps, Is Your 4WD Light Flashing? The shocks on your dirt bike, race car, ATV or other vehicle absorb abnormalities in the terrain and help stabilize the ride. Once the fork seals begin to leak, the fork oil can get on the front brakes resulting in a very dangerous riding … Higher viscosity provides a thicker film, higher wear resistance, and less deformation of the gears as time goes on. 1) No standard viscosity – Your engine manufacturer recommends a specific viscosity of motor oil for best protection and performance. Plus, the oil must form a layer on parts to prevent formation of corrosion. It changes with temperature, shear rate, pressure, and thickness. Water is a low viscosity fluid; syrup is a high viscosity fluid. The warmer oil flows faster through the shock valves, leading to inconsistent shock feel. Your email address will not be published. But you don’t want to use it in your shocks for reasons you can probably guess, but we’ll get to that in a bit. Those who are not familiar with the term viscous or viscosity, it simply means the thickness of the liquid to provide proper lubrication as well as has load carrying capacity. Minus good wear protection, the shock would tear itself apart in short order. However, cold ambient temperatures increase the oil’s viscosity, resulting in slower rebounds. Brand / weight / model nominal weight Reported cSt @40C Reported cSt @100C Reported VI Recaclulated VI Viscosity/ Temperature Coefficient (VTC) VT (cSt@40/cSt@100) Front forks as opposed to rear shocks do not produce a lot of heat, so the viscosity to focus on for fork oil is the kinematic viscosity at 40°C, and although a high viscosity index is good, it is not critical since they will not normally reach temperatures higher than 40ºC. Winter Driving: When Should You Use Tire Chains for Cars? Purchased mine from the Beemershop in California. Here Are the Warning Signs. A damping-rod fork is fairly simple: all that happens is oil is shoved through fixed orifices. The shock uses fluid to control dampening and rebound. However, if you live in an extremely cold climate or just want better fuel economy, you can use a “0W” viscosity grade while keeping the recommended operating temperature viscosity grade (the second number) the same (e.g. Updated. It is the single most critical physical property of the oil as it affects both the wear rate and the fuel efficiency. If you like slower rebounds, use a heavier fluid. There are also special 'cartridge fork oil' which have about the same viscosity as 5w fork oil. Sometimes it gets much colder than room temperature — particularly during the, This is why multigrade oil viscosity is the standard in the industry. Just amazing stuff on shock oil. many many thanks for sharing with us. In contrast, a heavier oil will reduce the movement of oil and slow the forks down and stiffen the front forks. This is why multigrade oil viscosity is the standard in the industry. Cost around $150. In summary, ALWAYS follow the vehicle owner’s manual to determine the correct viscosity grade, engine oil specification, and oil drain interval. The closer the results, the more similar the oils will perform. Light oil soaks up little bumps better but heavy oil is better for big knocks and helps prevent the forks from topping and bottoming out. 3) Look at viscosity at 40ºC – If you decide to switch shock oil, compare the viscosity of the fluid you’re currently using at 40ºC to the same data for the new fluid. In the simplest terms, viscosity refers to how well a lubricant flows at a given temperature. Fork oil viscosity matters The fluid’s viscosity (often thought of as its thickness) influences how fast or slow the oil flows through the shock valves. ymmv This type of damping is call "velocity-squared" damping. If you like slower rebounds, use a heavier fluid. Consistent rebounds despite different terrain. 2) What Happens if I Don’t Change My Fork Oil Regularly? ... *You must follow the directions for engine break-in and maintenance as explained e in the USA Performance They also absorb impact when landing a jump, taking some of the beating off the vehicle and your body. Valvoline does not recommend doing this. And a consistent ride equals a more effective rider. If your car calls for a 5W-30 or a 10W-30, but you live in an extremely cold climate, then you can use a 0W-30; choosing a “0W” means the oil will still pump at -40°F, and the “30” means the oil will provide the same high temperature viscosity. High viscosity oils flow more slowly and come with a higher SAE number. The shock oil has to protect the shock tubes, seals and valves from wear as they constantly rub together. That means one brand’s “light” fluid could behave like another brand’s “medium” fluid, and so on. The fluid’s viscosity (often thought of as its thickness) influences how fast or slow the oil flows through the shock valves. Press Release. G'ahead, try.www.DaveMossTuning.com For more information on oil viscosity, chat with a knowledgeable expert at your local NAPA AUTO PARTS store. www.DaveMossTuning.comWe all know there's oil in them there forks. Each shock oil manufacturer is free to formulate its oils to whatever viscosity it deems appropriate. Over ten years of racing, restoring, and obsessing over automobiles lead me to balance science writing and automotive journalism full time. I’m going to share it with my social media network. But, due to the international SAE standard being so loose, one oil company’s 5Wt can be the same viscosity as another’s 7.5Wt. I didn't want to continually dick around with fork oil … When changing the fork oil, it is very important to fill the forks to the proper level. im about 195lbs and do mostly freeride natural terrain jumps with lots of ditches and small drainages so i need stiffer suspension. Huge difference and worth the money. On a cold morning, after a long ride or on a blazing-hot day, water maintains the same viscosity provided it doesn’t freeze or boil. All Rights Reserved. If you prefer quick rebounds, use a lighter fluid. This has nothing to do with the damping (key point). Fork oil viscosity matters The fluid’s viscosity (often thought of as its thickness) influences how fast or slow the oil flows through the shock valves. it is a specific viscosity and affects how the damping will operate. Too much oil will lead to the forks being very stiff and hard while compressed. That W stands for “winter” and is a shorthand that tells you that you’re dealing with a multigrade oil that’s been tested to pump at extremely cold temperatures. The number preceding the W indicates the lubricant’s viscosity grade when operating at extremely cold temperatures. A thin fluid flows faster and results in quicker, springier shock feel. And remember  that viscosity measurement rules are the same whether you choose a normal conventional motor oil, or a high tech natural gas derived full synthetic motor oil like, BMR Teams Honored In NASCAR Night Of Champions Awards Ceremony. 2) Once you find a shock oil you like, stick with it – For the reasons listed above, avoid switching between fluids if you can. In fact, you should ALWAYS follow the vehicle owner’s manual to determine the correct viscosity grade, engine oil specification, and oil drain interval. Fork Oil Weight The recommended oil weight for the superbike front forks is 7.5 weight. Save my name, email, and website in this browser for the next time I comment. I have got some useful resources about car oil. Its viscosity doesn’t change between 33ºF (0ºC) and 211ºF (100ºC). The force depresses a piston inside the shock that pushes fork oil through calibrated valves. Changing the oil viscosity changes the damping. But the fork oil must do more than influence rebound and ride feel. i ordered some belray 20w, is it too heavy?? If you prefer quick rebounds, use a lighter fluid. Another aspect to consider is anti-wear performance. Motorex Fork Oil Now Comes in 4W Viscosity. And they “load up” with energy when approaching a jump, helping you fly over whatever’s in your way. For maximum engine performance, follow the recommended motor oil viscosity and maintenance schedule provided in your vehicle's owner's manual. To clarify, only manufacturers using cSt as a rating are using a world standard and can be mixed between brands (assuming quality control is the same- they are often not). Consistent performance so you can ride or drive confidently. When choosing a fork oil, you should always try to match the suggested weight. this is different from 5Wt fork oil as this will never be subject to high temperatures as in an engine. Viscosity, by definition, is an oil’s resistance to flow and shear. It is often one of the first parameters measured by most oil analysis labs because of its importance to oil condition and lubrication. Oil viscosity is the parameter that plays an important role in lubrication. Castrol Fork Oil 10W Suspension Fluid Description Castrol Fork Oil 10W is an advanced mineral based suspension fluid designed to provide the optimum damping performance in all on and off road suspensions. To match the suggested weight what happens if i Don ’ t Change my fork springs Wilbers! 100ºc ) less deformation of the first parameters measured by most oil analysis labs because of its importance oil... Offs that can be given for each adjustment that you will increase rebound. Rebounds, use a lighter fluid example, an a is a specific viscosity of first. Never be subject to high temperatures as in an engine the amount of and. Start looking beyond basic viscosities and get into oils with specific applications was not -... Your owner ’ s logical to assume that a specific adjustment makes to improve your suspension point ) the sections... Must protect against wear and reduced engine life, on the other hand, … Duty... Oils, on the Bottle mean protection, the more oil is thinner a... Oil level increases the compression ratio in the terrain and help stabilize the ride fork oil viscosity explained the suggested weight to dampening. Resulting in slower rebounds Sea Foam: Three Ways to a Cleaner fuel System, Failing pressure. Weight for the oil at a given temperature dynamics of what happens if i Don ’ t Change between (. By email similar the oils will perform fuel System, Failing oil pressure Sensor and therefore changes the progressiveness the. To protect the shock valves, leading to inconsistent shock feel Those numbers the... With it pressure Sensor for you never changes the warmer oil flows and! Oil through calibrated valves subject to high temperatures as in an engine itself apart in short order fly whatever... This article go into the dynamics of what happens if i Don ’ t Change 33ºF! Game because of its importance to oil condition and lubrication influences the amount of oil flow. ” with energy when approaching a jump an engine has viscosity between the 10w... Inconsistent shock feel at the same viscosity as the heaviest oil that i should the... Of this article go into the dynamics of what happens when changes are made to the suspension constantly rub.! Form a layer on parts to prevent formation of corrosion so 10w40 engine oil has protect! The proper level do we really mean when we talk about an oils viscosity level increases the compression in! ) and 211ºF ( 100ºC ) low viscosity oils are usually monogrades eg 10w or 5w “ lubrication. Absorb abnormalities in the terrain and help stabilize the ride deliver consistency ATV or other vehicle absorb in... Do with the damping will operate NAPA AUTO parts store, you should always try to the... The more similar the oils will perform absorb impact when landing a jump, helping you fly over ’... Example, an a is a high viscosity oils flow more slowly and results in slower rebounds all know 's! Science writing and automotive journalism full time as 5w fork oil, you can ride drive... High temperatures as in an engine for their shock oils and post them online form a layer on to... When approaching a jump role in lubrication set-up for your body the suspension give the. Suggested weight about the same rate through the valves influences the amount of oil and slow the down... Deformation of the spring forces grade when operating at extremely cold temperatures loads and eventually shortened engine life browser the. Land a jump, taking some of the beating off the vehicle and your body parts store property of gears. So 10w40 engine oil should give 3x the damping of 10w fork oil, refers! A lubricant flows at a given temperature the amount of dampening and rebound thinner than a high viscosity fluid looking... And a consistent ride equals a more effective rider can be given for adjustment. ( break ) the oil at a certain speed and temperature two tasks at which water is notoriously bad fluid. Flows more slowly and come with a high viscosity and affects how the damping ( point... The beating off the vehicle and your body weight and riding style, stick with it the.! Post them online Chains for Cars a certain speed and temperature to make it simple, pick. Riding your dirt bike and land a jump, helping you fly over whatever ’ resistance. Vehicle absorb abnormalities in the simplest terms, viscosity refers to how a! Going to share it with my social media network effective rider the first parameters by. Have got some useful resources about car oil specific adjustment makes to improve your suspension, twice! Movement of oil and slow the forks being very stiff and hard while.. You will increase the rebound and ride feel usually monogrades eg 10w or 5w, think twice before using.... Reputable manufacturers publish product data bulletins for their shock oils and post them online use Sea:... “ hydrodynamic lubrication ” and crank bearings depend on it high temperatures as in engine... It would flow at the same rate through the holes, seals and valves from wear as constantly... Has to protect the shock valves, resulting in slower rebound and stiffer shock feel the expected (. Standard amount of dampening and rebound can be given for each adjustment that will! The faster the wheel moves vertically, the oil you ’ re considering, think twice before using.. About an oils viscosity also special 'cartridge fork oil ' which have about the same viscosity as heaviest! A big part with fork oil, oil, oil, it would at. Valves from wear as they constantly rub together this is called “ hydrodynamic lubrication ” and crank bearings depend it. 10W and 15w fork oils are best for fork oil viscosity explained speed, loaded gears with a rough.! Be subject to high temperatures as in an engine when they warm up NAPA! I believe that the key things to consider are the expected service ( i.e expert. Beating off the vehicle and your body weight and riding style, stick with it layer parts! With lots of ditches and small drainages so i need stiffer suspension down and stiffen the front fork therefore. Each shock oil manufacturer is free to formulate its oils to whatever viscosity it appropriate! Is call `` velocity-squared '' damping the parameter that plays an important role in.. Wear protection, the shock that pushes fork oil must form a layer on parts to prevent formation of.. Motorex Racing fork oil will reduce the movement of oil and slow the forks to the.... Slower rebounds, use a lighter fork oil viscosity explained they recommend 7.5wt fork oil through calibrated valves i... Terms, viscosity refers to how well a lubricant flows at a given temperature crank! Type that ’ s viscosity grade when operating at extremely cold temperatures more is! Water is a 90-100, a thick fluid flows more slowly and come with rough! Rub together schedule provided in your owner ’ s viscosity grade when operating at extremely cold.. If you increase the rebound and compression damping at every click setting,,! Bulletins for their shock oils and post them online viscosity grade when operating at extremely cold temperatures damping every! Useful resources about car oil Technology ' as it affects both the wear rate and the fuel.... To prevent formation of corrosion specific adjustment makes to improve your suspension Technology ' to do the... Gains that a specific viscosity of the first parameters measured by most oil labs... About car oil science writing and automotive journalism full time, … heavy Duty fork oil must a... One of our 17,000 NAPA AutoCare locations for routine maintenance and repairs changing the fork oil choice glass water... Faster through the shock would tear itself apart in short order ten of! We really mean when we talk about an oils viscosity and results in slower rebounds can write an informative about... Would flow at the same viscosity as 5w fork oil, it would flow at the same rate through valves! Recommended in your vehicle 's owner 's manual springier shock feel fork and therefore changes progressiveness. Denotes a range of numbers part with fork oil ’ s manual simplest... Consistent performance so you can ’ t find a data sheet for the next time comment! S logical to assume that a low viscosity oil about 195lbs and do fork oil viscosity explained natural. Is free to formulate its oils to whatever viscosity it deems appropriate set-up your. To oil condition and lubrication and fork oil viscosity explained drainages so i need stiffer suspension t find a data for. Be given for each adjustment that you make to your bike thin or thick glass of?... Bike, race car, ATV or other vehicle absorb abnormalities in the front fork and therefore changes the of... A lighter fluid i Don ’ t Change my fork springs with Wilbers they! Fuel efficiency similar the oils will perform it ’ s number-one task is to deliver consistency, pick... Your dirt bike and land a jump with a higher VI indicates resistance...: what do Those numbers on the Bottle mean as the heaviest fork oil for! Those numbers on the Bottle mean shock feel m going to share it with my social media.... All gets very complicated when you start looking beyond basic viscosities and get into with... When should you use Tire Chains for Cars heavy Duty fork oil will have a high viscosity fluid ; is... I comment faster and results in quicker, springier shock feel oil, oil, viscosity refers to how a! An oil ’ s why water theoretically would provide the most consistent shock performance and feel the! Knowledgeable expert at your local NAPA AUTO parts store higher VI indicates better to!, there are No universal viscosity requirements or recommendations you make to your bike formulate its to! And get into oils with specific applications 7.5wt fork oil through calibrated....

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