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 40C, and although a high viscosity index is good, it is not critical since they will not normally.
Fork oil viscosity chart manual#
*Check the owner's manual and/or product information sheet before use. Besides just the raw viscosity data, there are other considerations to make when selecting a fork oil. Additional mixing is allowed for certain applications. The use of Valvoline SynPower Motorcycle Fork Oil 5W, 10W or 15W depends on the system in question and specific recommendations. Prevent foaming and in that way deliver constant high performance under all circumstances, which makes them highly suitable for off-road or motocross application Looks to me like 2.5 - 5 wt fork oils have viscosities of 4.1 - 5.6 100 degrees C so I suppose thats what they recommend for 150 lb riders. More specifically, Valvoline Fork Oils:ĭeliver smooth fork action with optimum damping and consistent fork operation over a wide temperature range.Ĭome with special additives to help protect the suspension system from wear, corrosion and oxidation Heres a chart showing fork oil viscosities: Fork oil weights As you can see there is quite a bit of variation in fork oil viscosity even among oils that are supposed to be the same weight. Another point of confusion is that motor oils and gear. The SAE weight system has a very broad and vague viscosity range and does not even cover the viscosity range that most quality motorcycle suspension systems require. Generally speaking, Valvoline Synpower Motorcycle Fork Oils 5W, 10W and 15W help maintain high levels of performance for different motorcycle systems. Suspension oil is labeled by weight because consumers are used to thinking of oil (ie. Additionally, Valvoline Fork Oils can be used on all vehicle parts, including forks, shock absorbers, monoshocks, etc. Brand: Weight: cSt 40C: cSt 100C: Pour Pt (F) Flash Pt (F) VI: Type: Royal: Twin Disc: 5.2: 1.7-45: 195: 95: petroleum: Red Line : Like Water: 5.5: 2.3: 5: 305. The make 7. I had this conversation with silkolene many years ago. The oils are suitable for all types of motorcycle telescopic forks and hydraulic shock absorbers under various riding circumstances. Mixing fork oils possible but it’s not linear. This high performance synthetic Fork Oil provides more responsive handling and is compatible in all systems, inclu. the need for more precise damping be required SVI Suspension Fluids range are all fully.
Here’s a really nerdy table that uses the much tighter Centistoke (Cst) testing scale, so we can compare brands with accuracy.Valvoline Synpower Motorcycle Fork Oils 5W, 10W and 15W are high-quality oils of different velocity grade created for motorcycles, mopeds, quads, and other front and rear motorcycle suspension systems. This high performance synthetic Fork Oil provides more responsive handling and is compatible in all systems, including damping rods, cartridge, bladder, conventional and inverted forks. Rock Oil, 90 Priestley Street, Warrington, Cheshire WA5 1ST.
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. just like polariss overpriced mystery oil no specs are given + unlike engine oils fork fluid viscosities VARY Then the fork is fully compressed (no spring). So what oil should you use in your suspension? Most suspension units use approximately a 5Wt (SAE). Buying the right oil for your bike is very important as it can effect performance and the amount of wear-and-tear your bike receives.