Re: [AMC-list] Tires For My Matador.

[Marc Montoni <Freedom@xxxxxxxx>]

Ken Ames <ameskg@xxxxxxxxx> said:


>Also note that the calculated tire circumference (based on tire size numbers)
>will probably not directly convert to the actual rotations per mile. I've seen
>the RPMs vary quite a bit for tires that are supposedly the same size. 
>These 2 are supposed to be 1975/75-14s:
>http://s143.photobucket.com/albums/r122/AMCKenA/?action=view&current=NC155.jpg


Yeah, except many tire makers cheat and simply measure the widest part of the tire, rather than at some standardized depth from the tread surface (or *at* the tread surface).

If you took one of those tire/rim width calipers http://www.sarveshwari.com/images/sg1p7.jpg and measured both of those tires they'd be within millimeters of each other.

I've always wondered about that stuff, myself.  I feel certain that measured circumference simply must be greater than actual circumference on a riolling vehicle.  And even then, it seems like variances in tire pressure would certainly cause additional skew in actual circumfrence.

-- Marc



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