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Date:         Mon, 20 Jun 2005 15:57:10 +0200
Reply-To:     bus.mail@IAE.NL
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Jaap Nauta <bus.mail@IAE.NL>
Subject:      Re: Speedometer -- the straight scoop
Content-Type: text

Looks like the answer, all right.

Maybe someone can help me with Mechanical Speedometer 101:

1. How do they work?

2. What can shift or age internally to cause them to read higher than manufacturing tolerance sez they should when used with the correct tires?

I assume that the tires are the correct size (185/14) because the odometer reads pretty darn accurately (2.5% error). I have a second reason to make this assumption. I base it on another assumption, a quick measurement, and some rough math: The little calibration number on the face of the speedo is 805. I assume that this means that it is set up for a tire that rotates 805 times in one mile. (A mile has 63,360 inches, the diameter of my tires are (roughly) 25 inches, one rotation of the tire covers (roughly) 78.5 inches, if it rotated 805 times it would cover (roughly) 63,192 inches . . . coincidence? You be the judge!)

-- That Rocket J Squirrel guy

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