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Originally Posted by pbaldy
Here's an interesting point. I called Santa Cruz Subaru to ask about the tolerances for tires (bought the car there, and trust them). They told me that the tires should be within 1/4" in circumference, which seems like a pretty small window. I'm certainly no expert, but I'd think you could get further off than that just with tire pressure. Are these cars that sensitive, or did I get bad information (or am I misjudging how much 1/4" is)? I'm thinking of taking all the tires off and measuring them.
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Rays had a RE92, cool.
I'd have to do the math, but circumfrance numbers are fairly useless. Just not rotating your tires often enough can get you off 2 or more 32nds in tread depth.
1 or 2 32nds is about my limit, so you did great.
If you want to check the wheel yourself, jack up the car and then using something very stable next to it(Cinder block, big wood block...), put a pencil right up next to the outside of the rim and spin the wheel. if the rim moves in or out, or up and down relative to the pencil it may be bent. You can't rely on the lip which is likely road rashed, the inner edge where the lip turns parallel to the spokes is a pretty good spot. Oh, make sure the other wheels are blocked because you will need it in nuetral with brake off probably.