2006 Sprint ST Stock vs Revalved Forks

When I used BruceC from T-Rat forums as a guinea pig for fork revalving I never did create any comparison of stock vs revalved data except the rebound velocity which is in a different post. I am doing another set of Sprint ST forks and the rider wants much the same as BruceC wanted. So here are some graphs showing the difference in valving between what I did for BruceC and a stock 2006 Sprint ST.

To start off I am going to show what the forks did prior to revalving and what they are doing after revalving.

In this first image the preload adjusters were all the way in to the last visible line, As you can see with the adjusters turned all the way in and stock fork fluid in the forks we have the start of the pogo effect. So the rebound is too fast.


Here is a graph showing the changes in rebound damping between stock and revalved. As you can see the new rebound stack is considerably stiffer than the stock stack.


Ok this is after revalving and using a lighter (Torco 5wt) fluid and running the same .95 springs. Notice the damping is more controlled and does not suffer the pogo after the rebound stroke.


Ok now on to the compression damping, I never did run any data acquisition on the compression side so that will be missing here.

Those that own Sprint ST's with stock forks will tell you it is a little spongy at low speed and when braking it dives quite a bit. So what I did was slow the low speed down a bit without causing any harsher hi speed damping. Sort of like having your cake and eating it to.

Anyway here is the graph and you can see that at lower speeds the damping is slightly stiffer but at hi speed it pretty much follows the stock curve.


Keep in mind when looking at the above I am also using a thinner fluid than stock to give a more consistent damping regardless of the outside air temperature.