🔍 What changed
Comparing the version from 13h ago by @tandy with the one from 13h ago by @tandy.
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- **A wheel spins rough or short** compared to the one opposite it at the same end. Compare sides — the difference is the finding, not the feel on its own.
- **A whine that rises with road speed**, which usually means grit has changed the gear mesh.
- **A shock has started weeping** after the session. Grit sitting on the shaft cuts the seal on the next compression.
- **A whine that rises with road speed**, which usually means grit has changed the [[Setting gear mesh with the paper trick|gear mesh]].
- **A shock has started [[Rebuilding shocks|weeping]]** after the session. Grit sitting on the shaft cuts the seal on the next compression.
- **The diff oil feels gritty** rather than milky — that is dust, not water.
- **The motor runs hotter than usual**, because dust packed around it stops it shedding heat.
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# What to do about it now
**Spin-test all four wheels** with the motor disconnected and compare left against right at each end. Gritty is cleanable; **notchy — catching at the same point every turn — means the races are already carved and it needs replacing.**
**[[Bearing spin test|Spin-test]] all four wheels** with the motor disconnected and compare left against right at each end. Gritty is cleanable; **notchy — catching at the same point every turn — means the races are already carved and it needs replacing.**
**After sand specifically, do not rely on the spin test.** Sand is harder and more angular than ordinary dust and it does not announce itself early. Pull and clean regardless of how it feels.
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