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From: joels@tektronix.UUCP
Newsgroups: net.bicycle
Subject: Re: Gear Ratios
Message-ID: <2579@tektronix.UUCP>
Date: Wed, 23-May-84 01:25:50 EDT
Article-I.D.: tektroni.2579
Posted: Wed May 23 01:25:50 1984
Date-Received: Fri, 18-May-84 05:55:24 EDT
References: <1474@sdccs6.UUCP>
Organization: Tektronix, Beaverton OR
Lines: 16


      Gear ratios on bicycles are measured in inches of Effective Wheel Size
(EWS). A gear of 33 inches is equivalent to having the pedals drive directly
a wheel of 33 inches diameter. The gear ratio is calculeted for each
combination of chainwheel and rear sprocket as follows.

    EWS= TF/TR*RD

WHERE:  TF= number of teeth in front sprocket
	TR= number of teeth in rear sprocket
	RD= diameter of drive wheel in inches

This works for any bicycle.

Joel Swank
Tektronix, Beaverton OR