LAISAHeadshake / instability on fast trail
When your bike shows "Headshake / instability on fast trail", these are the most likely causes - ranked by relevance: Sag, The standing attack position, Rebound. LAISA separates setup causes (adjusters, components) from riding technique.
Short answer for this problem
- Recommended starting point
- Check first: Shock: Sag
- Most important change
- Smallest documented change: 1 mm - loaded, rider in gear
- Why
- Rear too high / front too light - balance it via sag first.
- 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
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
Why this could fit: Rear too high / front too light - balance it via 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
Why this could fit: The front rebound returns too fast and starts the weave - slow it down a touch.
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
Why this could fit: Too much rear preload raises the rear and makes the steering nervous - reduce it.
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
Technique
Free. Pick bike, track and riding style.
Related symptoms
A starting point to verify on the bike - not a safety guarantee. Change one thing at a time and check on track.