![]() The spring rate of a coil spring refers to the amount of force needed to compress the springs in the fork. Minimal spring preload is recommended for better performance and longer working life of the springs, so it is better to change to a stiffer spring rate than to add significant preload (10+ turns.) Spring preload is used to fine tune the spring rate to adjust for the proper sag measurement. Bomber forks can use the maximum amount of preload from the adjuster and the fork will still get full travel. Preloading the springs will compress them slightly and increase the initial force needed to compress the spring. Spring preload can be done with the external adjusters on top of the fork. Refer to the following charts for reference. Keep in mind that the normal riding position on a DH bike may not be correct on level ground. The easiest way to measure sag is to put a zip tie around the stanchion and then measure how much the fork compresses when the rider is in the normal riding position. Marzocchi recommends 10-20% of XC travel and 20-30% of DH travel in sag to provide the best overall ride. Sag refers to how much the fork compresses when the rider is in the normal riding position. The tight tolerances make the fork last longer and work better. After the bushings, seals, and other parts have matched to each other, the fork will move smoother. ![]() ![]() Some forks may require 5-10 hours of use before the fork fully breaks-in.
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