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RE: Wrong tyres... oops

To: "'James Carruthers'" <j.carruthers@rave.ac.uk>
Subject: RE: Wrong tyres... oops
From: Richard Gosling <richard.gosling@exprogroup.com>
Date: Thu, 24 Apr 2003 14:04:26 +0100
James,

Well, the 165/70 tyre is not quite the same as a 155/80

165 * 0.70 = 115.5
155 * 0.80 = 124

So the 165/70 is 7% shorter than the 155/80.  Of course, that is added to
the 13" rim diameter, so overall height is only 3% less.
175/70 has a height of 122.5, so that tyre is probably the closest to the
155/80 you can get - at least without going to 205/60, and you'd never get
that onto a 5.5" rim...

Tyres are one of those great mixed-units definitions - in the same breath
the width is defined in mm and the rim radius in inches.  Almost as good as
a timber store I used to go to that sold 2 metre lengths of 2"x4"...

Richard & Daffy

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