Motorcycle fork oil viscosity chart7/27/2023 He also has a very handy chart with ratios for mixing the different Redline oils to get a specific viscosity. It's well worth taking the time to read his articles. The viscosity of fork oil is important as it has to maintain its. However, many people will recommend automatic transmission fluid (ATF) as a fork oil substitute thanks to its similar properties. Peter Verdone is the guy who put that chart together and he has some very good insight about this subject. There aren’t many suitable alternatives to motorcycle fork oil, as the role of this fluid is very important and specific on your motorcycle. ![]() I use Redline suspension fluid because it has some of the best VI numbers and I am custom mixing different viscosities at precise ratios to better control the acutal viscosity of the oil in my forks. ![]() When you look for VI numbers the higher the VI number, the better the oil is at maintaining its viscosity. VI is a measure of how well an oil maintains it's viscosity with a rise in temperature (the oil warms as it is forced through the orifices & valves in your fork) and the greater the change in viscosity with temperature, the bigger the change in your damping rates as you continue to ride. There is also the matter of Viscosity Index (VI). You might use brand X 10w and decide that you want to slow down your overall damping, so you buy a bottle of brand Y 15w not knowing that it is actually less viscous than brand X. A sure way to get lost in tuning your suspension is to use different viscosity oils from different manufacturers.
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