This is weird.
I had Continental Sport Contacts, 175/65R15 on the Scion. The odometer was dead on.
I switched to Pirelli P3000, same size, on the same wheels. Now the odometer is 4.5% low.
Doesn't that seem like a very large variance for the "same size" tire?
Yeah. Huh... That'd be over an inch of diameter if starting with a 25" tire...
Check this out...
And the bigger the tire size the worse the variances are!
I've seen as much as a 2" variance in actual tread width on the same rated size tire.
I've not paid as much attention to diameter only to note that it's hard to find 2 different tires, same size that have the same diameter. It seems they always vary by a little bit.
I never buy tires by rated size anymore I look to see actual dimensions and buy that way. If a tire manufacturer doesn't give you those dimensions I don't buy that brand. (Goodyear is bad about this)
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