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Date: Wed, 16 May 2001 08:45:00 -0400
From: Tony Shimi <tshiminopsame.org>
Subject: Re: RMP to MPH ratio?


The argument is essentially correct, BUT the indicated (gauge) speed does not care what size tire (tyre) you're using; it's a function of the number of rotations of the crank shaft. That's why when you install a different size tire than the one that came with the car there will always be a difference between indicated and actual speeds. Tony Steve Chew wrote: > > Erm, surely, the bigger the wheel, then the higher the road speed, for > any given engine rotation? > > So yes, tire size and pressure will affect the MPH/RPM ratio, to a > varying degree of severity, of course. > > In article <B726E098.3602%no_use_to_spamnopsam_off.com>, Sven > <no_use_to_spamnopsam_off.com> writes > >in article B726BE72.A175%jamesnopsamAM.nospam, James A. Barbour at > >jamesnopsamAM.nospam wrote on 15-05-2001 11:07: > > > >> Could this be affected by tyre size and / or pressure? > > > >No, gearratio stays the same. > >X rpm -> X rotations of wheels > > > >Real speed changes, but then you need a radar to check it. > > > > -- > Steve Chew --

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