Tire size calculator

Dick:

To bad the calculator doesn't allow for inputting the original/former
coach tire size (e. g. 8.75R-16.5).

Paul Bartz

From: Richard Guthart [mailto:rguthart]
Sent: Sunday, September 13, 1998 10:19 AM
Subject: GMC: Tire size calculator

The recent discussion of tires reminded me of a useful little tire size
calculator on the web which makes it easy to compare different sizes and
aspect ratios. Thought I'd pass on the URL:
http://www.miata.net/garage/tirecalc.html

Dick Guthart
'77 Birchaven
 
Paul,

I agree.

If the original tire is a "78" profile then the diameter of the original
16.5" tire is 30.15" vs. 29.2874" for the 225/75R16's that we are now using.

>To bad the calculator doesn't allow for inputting the original/former
>coach tire size (e. g. 8.75R-16.5).
>
> Paul Bartz
>
>From: Richard Guthart [mailto:rguthart]
>Sent: Sunday, September 13, 1998 10:19 AM
>Subject: GMC: Tire size calculator
>
 
Dick:

Last year when I changed over to Alcoa wheels and purchased 16"
Bridgestone tires, the dealer told me the original or 8.75 R-16.5
Michelin XPS tire I had on the coach have an O.D. of 29.2" and the
225/75R-16 tire has an O.D. of 29.3", which correlates with your 29.2874
number below. Hence the 225/75 is a close fit for the original.

Paul Bartz

From: Richard Guthart [mailto:rguthart]
Sent: Monday, September 14, 1998 12:55 PM
Subject: Re: GMC: Tire size calculator

Paul,

I agree.

If the original tire is a "78" profile then the diameter of the original
16.5" tire is 30.15" vs. 29.2874" for the 225/75R16's that we are now
using.

To bad the calculator doesn't allow for inputting the original/former
coach tire size (e. g. 8.75R-16.5).

Paul Bartz

From: Richard Guthart [mailto:rguthart]
Sent: Sunday, September 13, 1998 10:19 AM
Subject: GMC: Tire size calculator
 
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