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Subject:Re: Spare tire storage
From:Mike S
Date:Tue, 26 May 2009 20:04:56 -0400
At 07:06 PM 5/26/2009, Brenton Tait wrote...
>How can I calculate the rolling radius?

Most tire manufacturer's show the number of revolutions per mile for
each size/model tire. That is directly proportional to the rolling
radius.

A Hankook RA08 in the stock 185R14 size rolls 812 revs/mile. (
http://www.hankooktireusa.com/product/RA08.pdf )

I have Falken Ziex ZE-912 215/60R16 99H tires, which roll 808 revs/mile
(http://www.falkentire.com/Tires/ZE-912-2).

The 0.5% difference is insignificant, even for a Synchro. You'd
probably create more of a difference than that depending on how you
load weight in the van.