# How to measure a Metric Pit Bike Bearing

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This is an article from the TBolt USA Tech Database, the store's free online library of pit bike technical info. The text below is the article as written.

## Article

How to measure bearings:

Each bearing has an inside diameter, outside diameter and width diameter in that order.

Bearings are METRIC size

ONLY METRIC

A = Inside diameter
B = Outside diameter
C = Width diameter

Example:

Industry Standard Size 6003 2RS

The 2RS Means it has 2 Rubber seals , one on each side to keep lube in and dirt out

Common Swing Arm bearing for pit bikes 6003 2RS Measures 17X35X10

Inside diameter = 17mm
Outside diameter = 35mm
Width diameter = 10mm

## Tech Database sections

- [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)
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- [Pit Bike Installation Info](https://tboltusa.com/store/pit-bike-installation-info-tech-99.md)