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Rec.Bicycles Frequently Asked Questions Posting Part 3/5
Section - 8b.24 Measuring the circumference of a wheel

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For accuracy, the speedometer wants to know how far the bicycle
travels per wheel revolution (under normal load and inflation).
Therefore, that is what must be measured, and it is commonly called
the "rollout distance".  To make this measurement, sit on the bicycle
in typical riding position next to a wall for support, and roll
forward, starting with the valve stem exactly at the bottom at a mark
on the floor.  When the stem is again exactly at the bottom, measure
the distance traveled.  Typically this distance, for a 700-28 tire at
120 lbs pressure, can be as much as 30 mm shorter under load than
rolling the unloaded wheel for one revolution.

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Top Document: Rec.Bicycles Frequently Asked Questions Posting Part 3/5
Previous Document: 8b.23 Coiling a Wire Bead Clincher
Next Document: 8b.25 What holds the rim off the ground?

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Send corrections/additions to the FAQ Maintainer:
iglesias@draco.acs.uci.edu (Mike Iglesias)





Last Update March 27 2014 @ 02:11 PM