Why does "Rear steps out on power (tarmac)" happen?

The most common causes are: Rear tire pressure, Compression, Compound. Check them in this order; it is often the setup, sometimes the technique.

All symptoms

Rear steps out on power (tarmac)

When your bike shows "Rear steps out on power (tarmac)", these are the most likely causes - ranked by relevance: Rear tire pressure, Compression, Compound. LAISA separates setup causes (adjusters, components) from riding technique.

Short answer for this problem

Recommended starting point: Check first: Tire: Rear tire pressure
Most important change: Smallest documented change: 0.05 bar
Why: Rear pressure is off for the tarmac temperature - set it to the SM hot target.
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, drafted automatically 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: CompressionCheck first

Why this could fit: Too little compression support lets the rear squat then break loose - add 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: ReboundCheck next

Why this could fit: Rebound returns too fast and unsettles the rear on drive - slow it 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: 1 click - clicks out from fully closed

Tires

Tire: Rear tire pressureCheck first

Why this could fit: Rear pressure is off for the tarmac temperature - set it to the SM hot target.

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: 0.05 bar

Tire: CompoundCheck first

Why this could fit: The compound is too hard for the temperature - it never reaches its grip window.

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.

Calculate a setup for my bike

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Related symptoms

Front chatter under hard braking (tarmac)Front pushes on tarmac entry Rear hops/chatters when backing it in Understeer on tight kart tarmac

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