Suspension glossary
The key suspension terms used across the calculator and the manuals, explained in plain language.
Suspension terms, defined
Definitions- SAG
- Amount the suspension compresses under static weight. Free sag (unloaded bike): 0–10 mm — verifies the spring rate is appropriate. Rider sag (rider aboard in riding gear): 25–40 mm depending on riding style — adjusted by turning the spring preload. Correct sag keeps the chassis geometry balanced and ensures full suspension travel is available.
- Spring preload
- Sets initial spring tension. More preload raises the bike and stiffens early travel — suitable for heavier loads. Less preload lowers the bike and softens the first millimetres of travel. Depending on the adjuster it is set either in turns of a threaded collar, or in steps of a stepped (cam) collar moved with a hook spanner — in that case "position 3" means the 3rd step from the softest setting, not three full turns.
- Compression
- Controls how quickly the suspension compresses under a bump. More clicks = slower, firmer compression — limits dive under braking but can feel harsh. Less clicks = softer, more reactive fork or shock. Measured in clicks.
- Rebound
- Controls how quickly the suspension returns to neutral after being compressed. Too fast: bounces back before the wheel settles — chattering. Too slow: suspension stays compressed, packing down and losing grip. Measured in clicks.