Check The Truth Of A Rim

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

<h3>Step 1</h3><p>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.</p>
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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

<h3>Step 2</h3><p>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.</p>
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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

<h3>Step 3</h3><p>The easiest way to check rim truth is using a wheel jig, also known as a 'truing stand'.</p>
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A Wheel Truing Jig

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