I have a FB with 15x7 Kosie K1 wheels.

I have 205/55/r15s all around but I want to run a 225/55 on the rears. I have a programable Sport comp Speedo so thats not a problem.

What will this do to the shape of the tire, the 205s are very squared off right now. I would think that a 225 would round slightly.

 

just SLIGHTLY. it wouldn't be all that noticable. you're fine.

 

you will understeer more with the wider tires out back, but it should fit fine.

 

the cars going to make 300+ at the wheels. I dont think understeer will be a problem

this is meant to be a track car,

if it does infact understeer to much, Can I just adjust it out with the Rear sway bar?

 

I had 225/50/15 in the back of my FB, no problems at all.