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more on tires -- what size?

To: "'6pack@autox.team.net'" <6pack@autox.team.net>
Subject: more on tires -- what size?
From: "Vink, Graham" <vinkg@fleishman.com>
Date: Thu, 9 May 2002 12:07:25 -0500
thanks for all the useful feedback on tire selection. Now my next question:
what size?

People seem to be running mostly 215/70-15 or the slightly smaller
205/70-15. Any strong sentiments why?

I dug up the following information on tire diameters:

MICHELIN REDLINE 185R15 (sold by Coker, this is presumably closest to the
"original" tire)
        7       Overall Diameter: 26.50 
        7       Cross Section: 6.50 

        Coker Classic redline, 185/15
        7       Overall Diameter: 27.00 
        7       Described by Coker as "Perfect replacement tire for TR-6"

Pirelli P400 Touring, 205/70-15 (just a sample tire that I picked; I'm sure
others will vary slightly)
        7       Overall Diameter, 26.2

Pirelli P400 Touring, 215/75-15
        7       Overall Diameter, 26.7

So ... which size is likely to give the most accurate speedo reading? And is
there a significant difference in performance between the -75 and -70 series
tires?

> --Graham
> 
> '63 Austin Healey 3000
> '72 TR6
> '87 Mazda RX7 NA
> '89 Trooper (tow vehicle!)

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