Check The Truth Of A Rim On A Bike Wheel

Introduction

The rim of a bicycle wheel needs to be a round circle and a flat disc. This gives a comfortable ride and is most important if the rim is used as a braking surface.

Step 1

Use The Brake - Check The Truth Of A Rim On A Bike Wheel

Use The Brake

Watch the wheel rim where it passes through the brake. If it moves from side to side as it spins then the rim is not a flat disc. If it moves up and down as it spins then the rim is not a round circle.

Step 2

Where The Bike Has No Rim Brake - Check The Truth Of A Rim On A Bike Wheel

Where The Bike Has No Rim Brake

If the bike has no rim brake you can improvise another index by lashing a pencil to a seat-stay with a rubber band or a cable-tie.

Step 3

A Wheel Truing Jig - Check The Truth Of A Rim On A Bike Wheel

A Wheel Truing Jig

The easiest way to check rim truth is using a wheel jig, also known as a 'truing stand'.