Tire size

[Boostin240sx]

Currently I have 17x8 +35 with 235/45 17 all the way around. I am replacing the rears with 17x9 +20 and buying all new tires. I'm considering 255/40 17 rear and 235/45 front. Any suggestions for getting different sizes?

[ryangreg]

What kinda tires? Different brands will bulge more or less at the sidewalls, making it difficult to gauge what size tire you want. Your going for a nice fitment im assuming. Perhaps a tiny stretch?

[1mns13]

How much torque are you making? How much understeer is acceptable to you? That will help us help you.

[SRPILOT]

Do you also want max traction or is this for drifting.

[Boostin240sx]

As for the brand I was considering kumho spt or yoko ES100s. I would like to have good traction but not be a pig if I want to take it to the track.

[SpeedMonkeyInc]

235/40s will be better. The 45s are too tall IMO

[revat619]

^^^ Word. :bow:

On the 9s, run a 235/40 and on the 8's, run a 225/45.

[Boostin240sx]

235/40 on a 9? The point of wide rims are wider tires, I think Speedy was referring to 235/40 in the front.

[SpeedMonkeyInc]

You are right, wider rims for wider tires. Up to a point however. One of the benefits of a wider wheel is to be able to run a wider tire at the same time as gaining a stiffer sidewall. Too wide a tire will negate that benefit.
I run 235/40 on 9s all around. Perfect. Very square sidewall with my Cooper Zeon tires. Other brands will sit a little bit differently. Such as the ES100s I have in back right now, sit a little bit pulled.

Revat's size suggestion is SPOT on in my opinion.

[EchoOfSilence]

245/40 wouldn't hurt. but i also don't understand 235 on the rears if you want to maximize traction.

Boostin240sx, is this on an s14?

[Boostin240sx]

Yeah it is on an S14.