I switched to the equivalent (warm viscosity) RSF instead as it performs better on track (less fade) and it's less crashy feeling when cold. Here's a nice table of comparative viscosities of fork oils:įor reference, I found that in my Showas (fresh) 5w Silkolene "maintain" was adequate for compression, but the rebound needed to be closer to 20w when warm. So the 2.5 is the perfect starting point. So a balance needs to be found, and in the absence of adjusters, it will tend to satisfying the compression needs first, in the name of comfort. So whilst this was fine in the Showa units as one leg did compression and the other did rebound, it's less ideal in the Marzocchi and Sachs forks where I don't believe it's separated like that. Unfortunately the spec for the forks, no matter the manufacturer it seems, results in too little rebound damping. RSF 2.5 would be ideal yes, it's thicker than the grade number would suggest because it's more like a shock oil in that it doesn't thin out as much as it heats up.
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