I have bought tires from both tire rack and edge racing (I tend to go through alot of tires) my new favorite is
Tires for PASSENGER CARs very cheap, bargains, have a look and save
I find they have better tire size selection - and more offbeat brands than tirerack - they were quicker on shipping too.
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower"
-Mark Donohue