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FOX SHOCKS 1.800 DIAMETER VALVING SHIM FOR FOX 2.0 - 2.5 - 3.0 SHOCKS THAT HAVE 0.625 OR 0.875 SHAFT
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Quantity in Basket:
None
Part Number: FOXSHIM-1800
Price: $2.50
Sold As:
1 Valving Shim
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By changing the quantity, thickness, and arrangement of the valve shims, you can tune the shock for different operating characteristics. There is a valve stack on both sides of the damper piston. The bottom side of the piston controls compression damping, and the top side controls rebound damping.
The rebound valve shim stack, in most cases, will have a smaller outside diameter than compression valve shims do and the valve shims will usually be thicker when compared to the compression valve shims. This is due to rebound damping having to resist the force of the spring, and because piston speeds are much slower during rebound.
There is an unlimited amount of valving combinations, so many different variations will achieve very similar results. Many suspension technicians that routinely tune suspensions will have different ideas regarding how to increase or decrease damping with valve shims. As long as the rider is happy with the changes, this is what matters most, not how one achieved the results.
You should consider working on shock valving only after you have determined the correct rear shock sag setting for the application. Also, make sure that everything in your suspension is well lubricated and is moving freely.
On a bypass shock if the compression damping adjustments are full in "closed", you should be thinking about adding compression valve shims. If your compression damping adjustment is full out "open", and your suspension is still feeling over-damped, you should be thinking about removing compression valve shims.
In general, the rebound damping does not need to be changed unless the spring rate is changed. If you increase the spring rate, a corresponding increase in valve resistance is recommended.
It is better to use more thin shims than a few thicker shims as the thin shims will provide better, smoother damping.
However, two .006" thick shims do not equal one .012" thick shim, as the two thinner shims would deflect more (be softer) than the single thick shim.
If you are using a progressive stack with a gap shim in place, by making the gap shim thicker, the shock becomes softer. You would think that a thicker shim would make the shock stiffer, yet what really happens is the thicker small diameter gap shim lets the large shims deflect further before hitting the next line of progressive shims in the second stage stack, thus making the shock softer.
Another alternative is to go to a different diameter gap shim. As mentioned previously, the valving combinations are endless.
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