The 205 or 185 number is the measurement across the tire tread. The 70 or
75 number is the percent of the tread that is the height of the sidewall.
Valerie
----- Original Message -----
From: "Vink, Graham" <vinkg@fleishman.com>
To: <6pack@autox.team.net>
Sent: Thursday, May 09, 2002 12:07 PM
Subject: more on tires -- what size?
> 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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