One thing to keep in mind is this, tireracks prices DO NOT include mounting/balancing as well as insurance, but I'm sure they offer it too but its alot easier to go into the local Discount Tire and get the tire repaired/replaced then to go to the place that might be across town and go through the hassle of sending it back to tirerack.

I'm not saying that tirerack is bad, just something to think about.