Jim,
Don't strain your brain. Use this:
http://www.miata.net/garage/tirecalc.html
Regards,
Phill Brook
www.users.bigpond.com/fairlady
----- Original Message -----
From: Gammon <gammon@optonline.net>
Date: Thursday, October 16, 2003 10:50 am
Subject: Datsun
> If you put on tires with a larger circumfrence, the speedo will be
> off
> by a percent. Measure both and divide the new one by the old one
> (new/old=ratio). For example, 42"/40"=1.05. If you read 100mph on
> your
> speedo after that, it is really 105. At 50, it is really 52.5 mph.
>
> JimG
|