VI is an indicator of the change in viscosity of the fluid as a result of change in operating temperature. Verdone DOES NOT suggest that a higher VI is "better" than a lower VI for all riders in all conditions. That's why such a wide range of options (as well as adjustment settings) are available. There's no "better choice" for suspension fluid, just as there are no "better choices" for suspension settings that could possibly apply to every rider in every case. The kind of damping performance most desired from forks is very much dependent upon a list of considerations that are specific to every rider, including the kinds of roads ridden, the way those roads are ridden, the loads, ranges of loads, and proportions of riding time differing loads may be employed (solo, pillion, cargo), spring rates, valving design, etc. Anything over 100VI will be serviceable for them.Īs you no doubt know (?) Suspension damping is a very subjective thing. While motorcycle rear shocks require very high VIs (over 300) to function well over such a huge temperature range, motorcycle forks and bicycles do not.
I have the Ohlins so I have been using the R&T but I'd like to try mixing Redline or Silkolene Pro as Verdone suggests. The way I interpret what he is talking about, if your adjusters are dialed more than halfway out to obtain ideal damping, I think you should consider using a lighter oil/fluid, but if you close the screws to 1 full turn from fully closed and still don't get enough damping, you need a heavier oil/fluid. Understanding what he means by that will really help you select the best oil.Īll too often people use too thick of an oil. This ensures that a fair amount of fine tuning will be available for track and weather conditions." "In general, Use the least viscous oil possible that produces good slow speed damping performance with the damping adjustment screws out 1 full turn from full closed.
It seems like better choices are the Golden Spectro Very Light and SX400, both with Viscosity Index of 400, or use what Verdone suggests, the Silkolene Pro or the Redline, with V.I.s of 372 and 389, mixed to the appropriate weight. I think I missed the Marzocchi entry in the chart before. Those are also very close to the Marzocchi fluid rated in that chart at 26.10 cSt 40C with a Viscosity Index of 150. NOTE: ~2C difference between temp for the ratings Golden Spectro 125/150 SYNTH CARTRIDGE FORK FLUID at 26.26 cSt 100F (~38C) Verdone rates Maxima 125/150 (7 wt.) Racing Fork Fluid at 26.70 cSt 40C
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