Suspension Tuning Guide

The Basics of Motorcycle Suspension

Motorcycle suspension isn't a dark art—it's physics. Every clicker on your fork or shock is designed to control how the spring compresses and rebounds under the immense dynamic forces of braking, accelerating, and cornering.

1. Setting Sag (Preload)

Rider sag is the foundational metric of your setup. It dictates the chassis geometry. Without properly setting your sag using the spring preload collars, your bike will never steer correctly, regardless of how you adjust your damping clickers. Generally, sportbikes aim for 30-35mm of front sag and 25-30mm of rear sag, though specific geometries dictate exact numbers.

2. Rebound Damping

Rebound controls the speed at which the spring returns to its natural length after being compressed. If your rebound is too slow (too much damping), the suspension "packs down" over multiple bumps. If it's too fast (too little damping), the bike behaves like a pogo stick, lacking stability.

3. Compression Damping

Compression controls the speed at which the spring compresses. It takes the harshness out of bumps and controls pitch changes. High-speed compression deals with sudden, sharp impacts (like a curb or pothole), while Low-speed compression manages slow, rolling weight transfers (like heavy trail braking or smooth acceleration).

Diagnosing Track Issues

When solving track handling issues, always break the corner down into phases:

1. Braking & Turn-in: Front forks dive. Rear shock extends.
2. Mid-Corner: Suspension is somewhat settled, geometry relies on trail geometry.
3. Exit & Acceleration: Rear shock compresses under load, front forks extend.

A bike that exhibits "understeer" (running wide) on Corner Entry is often a completely different mechanical fix than a bike that runs wide on Corner Exit. Always diagnose your clickers by the specific phase the issue occurs in.