# Inspecting Wheel Bearings

Wheel bearing failure on track is dangerous. Inspect bearings annually (or any time you notice vague handling, grinding, or play in a wheel). The Rush SR uses **sealed wheel bearing hub assemblies** — the same unit at all four corners, bolting directly to the upright. These require no preload adjustment or re-greasing; when they wear out, the entire hub assembly is replaced.

The factory maintenance schedule calls for bearing replacement at **every 4 years / \~160 hours**.

## Inspection — Lift Test

1. Safely lift and support the car with the wheel off the ground.
2. Grip the tire at 12 and 6 o'clock and try to rock it — there should be **zero** play.
3. Grip at 9 and 3 o'clock and repeat.
4. Any detectable play indicates a worn bearing assembly that must be replaced before the car goes back on track.

## Inspection — Rotation Test

1. With the wheel off the ground, spin it by hand.
2. It should spin smoothly with no roughness, grinding, or uneven drag.
3. Any roughness or notchiness indicates a worn hub assembly.

## Replacement

The sealed hub assembly bolts directly to the upright — remove the wheel, unbolt the hub from the upright, and fit the replacement. Replace the hub assembly (not just the bearing) — they are not user-serviceable internally.

Refer to [torque specs](/maintenance/torque-specs.md) for hub bolt torque values.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://manual.rush.sr/maintenance/each-year/inspecting-wheel-bearings.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.