# Bearing

> A bearing is a machine element that reduces friction between a rotating shaft and a fixed housing using balls or rollers.

- **Also known as:** Yatak, Bilyalı rulman, Bearing, 6201, 6202
- **Turkish term:** Rulman
- **Category:** [Bearings](https://motorsikletparcasi.com/en/category/bearings)
- **Page:** https://motorsikletparcasi.com/en/glossary/bearing

Motorcycles use bearings in the wheels, crankshaft, gearbox, [steering head](https://motorsikletparcasi.com/en/glossary/steering-head-bearing) and swingarm. Ball bearings are identified by standard codes such as **6201** (12 × 32 × 10 mm) and **6202** (15 × 35 × 11 mm). Suffixes show the sealing: **2RS** has rubber seals on both sides, **ZZ** has metal shields on both sides.

- Symptoms: a rumbling noise, sideways play in the wheel, a rough feel when turned
- Wheel bearings are usually replaced in pairs together with the spacer
- When fitting, press only on the outer (or interference-fit) race with a suitable driver

## Related terms

- [Steering head bearing](https://motorsikletparcasi.com/en/glossary/steering-head-bearing): Steering head bearings are the upper and lower bearings that let the front fork turn smoothly in the frame's steering head.
- [Crankshaft](https://motorsikletparcasi.com/en/glossary/crankshaft): The crankshaft converts the piston's up-and-down motion into rotation through the connecting rod.
- [Oil seal](https://motorsikletparcasi.com/en/glossary/oil-seal): An oil seal is a lipped seal on a rotating or sliding shaft that keeps oil in and dirt out.
- [Wheel rim](https://motorsikletparcasi.com/en/glossary/wheel-rim): A wheel rim is the metal hoop the tyre sits on; it is joined to the hub by spokes or cast spokes to form the wheel.

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- Source page: https://motorsikletparcasi.com/en/glossary/bearing
- Last updated: 2026-10-09
- Türkçe sürüm: https://motorsikletparcasi.com/sozluk/rulman.md
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