Check alignment and pressures. I've ran different front and rear on multiple cars with multiple sizes and brands and never had an issue that scared me. Now I do have toe out in front slightly and on roads that aren't flat it will move slightly even with matching continental dw's, so that's why I'd check alignments out, firestone lifetime is usually 180, I get mine done every 6 months or when I change tires so usually 4-6 times a year

You might also want to check the lug nuts. I have seen techs just tighten by hand and forget to torque them down.

Or zap them down with the impact and now you have to jump on the damn lug wrench to break them loose when you have a flat. There are only two torque specs for lug nuts to the average tire monkey - finger tight or 500ft-lbs.

Yeap, this happened to me when I installed Bridgstone S04's on the rear and had the factory Advans up front. They should be better after some breakin but it will still feel off a bit. You should have just bought a set of Bridgestone SO4's all around. They are good tires for the money.

:iagree:
You have tires with different constructions.

Unless you want to intentionally invoke understeer or oversteer depending on your car setup, experience and mastery of the skinny pedal :D

Different tires front and rear aren't always a bad thing.

Definitely. Most tire stores don't put in the right amount.
Specs on our car is 35 pounds cold.


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Got a few hundred miles on them now and they're doing much better. I also increased the rears to 36psi which also helped.
These firestones are actually pretty good. They're very quiet. These tires really hook up nice and it launches better than ever, which I try not to do often...
Still gonna swap out the front ones soon though just to have the same tires all the way around.
Thanks for all the suggestions!