Compression and Rebound Adjusters

Fork Adjuster Buying Guide

Compression and rebound adjusters are small plastic or aluminium knobs that take a disproportionate amount of abuse. They sit at the top and bottom of the fork legs, exposed to every rock strike, crash and muddy ride. When they break, you lose the ability to fine-tune your suspension — and a fork you can't adjust is a fork that's compromising your ride.

Rebound Adjusters

The rebound knob sits at the bottom of one fork leg (usually the right on RockShox, left on Fox). It controls how fast the fork extends after a compression. These fail when the internal hex interface rounds out, when the detent mechanism wears (the knob spins freely without clicking), or when the knob itself cracks from a rock strike. Replacements are fork-specific — a Pike rebound adjuster is a different part number to a Lyrik one, even though they look similar.

Compression Adjusters

Compression adjusters sit on top of the fork leg. Simple forks have a lockout lever (open/firm). Mid-range forks add a low-speed compression dial. High-end forks (Charger RC2, GRIP2) have separate high-speed and low-speed compression knobs. The top cap and adjuster assembly are integrated on most forks — replacing the adjuster means replacing the entire top cap unit.

Lockout Levers

Remote lockout levers mount on the handlebar and actuate the compression damper via a cable. These are common on XC forks (RockShox SID, Fox 32 Step-Cast) where locking the fork for climbing is useful. The lever, cable and fork-side actuator are all replaceable separately. If the lockout stops working, check the cable tension first — it's usually a stretched cable rather than a failed lever.

Finding the Right Part

Fork adjusters are annoyingly model and year-specific. RockShox changed the rebound adjuster design between Charger 1 and Charger 2 dampers, even on the same fork model. Fox changed the GRIP adjuster between model years. The most reliable way to find the right part is your fork's serial number — punch it into the manufacturer's online parts catalogue to get the exact part number.