Why does "Rear kicks on braking bumps" happen?

The most common causes are: Rebound, Low-speed compression, Sag. Check them in this order; it is often the setup, sometimes the technique.

All symptoms

Rear kicks on braking bumps

When your bike shows "Rear kicks on braking bumps", these are the most likely causes - ranked by relevance: Rebound, Low-speed compression, Sag. LAISA separates setup causes (adjusters, components) from riding technique.

Short answer for this problem

Recommended starting point: Check first: Shock: Rebound
Most important change: Smallest documented change: 1 click - clicks out from fully closed
Why: Main cause: too much rebound makes the rear pack over the bump series - open the rebound.
How to test it: Read the current value off the bike and compare it with the recommended one. Write it down before you change anything.
Source: LAISA diagnosis catalogue, hand-authored and editorially released Methodology →
Last reviewed: No review date documented

Pick your bike to apply the fixes directly →

The order comes from the stored strength of the symptom-cause link in the catalogue - per symptom, not across symptoms. These are not probabilities and not measurements.

Suspension

Shock: ReboundCheck first

Why this could fit: Main cause: too much rebound makes the rear pack over the bump series - open the rebound.

How to check it: Read the current value off the bike and compare it with the recommended one. Write it down before you change anything.

Smallest change: 1 click - clicks out from fully closed

Shock: Low-speed compressionCheck next

Why this could fit: Too much low-speed compression makes the rear harsh over the bumps - open it a little.

How to check it: Read the current value off the bike and compare it with the recommended one. Write it down before you change anything.

Smallest change: 1 click - clicks out from fully closed

Shock: SagCheck next

Why this could fit: Wrong sag (too little / spring too stiff for the rider) - check sag first.

How to check it: Read the current value off the bike and compare it with the recommended one. Write it down before you change anything.

Smallest change: 1 mm - loaded, rider in gear

Shock: High-speed compressionCheck next

Why this could fit: Square-edge hits are a high-speed event - open the HS compression slightly.

How to check it: Read the current value off the bike and compare it with the recommended one. Write it down before you change anything.

Smallest change: 0.25 clicks - clicks out from fully closed

Hardware

ShockRarer

Why this could fit: A worn or poorly matched shock - a service or a better-matched shock setup helps.

How to check it: Check the part's condition and that it is properly seated before touching the setup.

Technique

Body position in braking bumpsRarer

Why this could fit: Too much weight forward unloads the rear into the bumps - stay centred, elbows up.

How to check it: Ride the drill deliberately for a few laps on the same section and watch whether the behaviour changes.

How to set your sag →

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Related symptoms

Bike kicks / bucks off jump faces Fork harsh / deflects on braking bumps Front feels vague / low grip on hardpack Front knifes/oversteers in ruts

A starting point to verify on the bike - not a safety guarantee. Change one thing at a time and check on track.