nikogio38

Im getting fender work done in the next couple months the shop needs the wheel and tire setup on the vehicle when i drop it off. im going go with 18x8.5 20 offset in the front and 18x10.55 27 offset in the rear. Im going with Bfgoodrich Rival tires 245/40R18 in the front and Im undecided on the rear either 295/35R18 or 315/30R18 not sure how wide I can go with out rubing on the inside... has anyone on here ever run with a 315 tire in the back???

FSportIS

iTrader: (13)

That 315 is crazily wide... i think you are the first few who does that. Why would you do that though? the stock 255 already provided adequate traction for the rear.

NYKnick101

This is the only IS that i know with a 315/30 but as you can see he has modified fenders IS300 315/30

There are plenty of IS-F's with 295's but the is-f is also a bit wider than the is-x50's

nikogio38

Number 1 reasons better handling and looks... and the fact that maybe no one has done it before!!

4TehNguyen

iTrader: (1)

increasing the grip on the rear that much over the front is going to result in understeer

meine96ws6

315 is overkill

Sffd103

iTrader: (16)

My buddy is running 315/25/20 on his but had the front and rear flared. Don't have a pic of the wheels right now though. He actually needed some more work to make them fit right.

jennie

Holy beejesus a 315 tire?! I don't think it will fit unless you pull the hell out of the fenders and even then I think you would have some serious rubbing issues considering your wheel width and offset.

nikogio38

Ill have to do alot of mesuring and see how much room I got....if i cant fit the 315 will maybe have to go with 295. Or switch to a different tire and maybe run a 305

nikogio38

True but think of how sick a slammed is350 on a 315 would look!!!

FSportIS

iTrader: (13)

If you run 315 on the rear, you need to run a wide front tires as well to make the car balance. If not, like he mentioned, you will have excessive understeer which is worsen the performance. Also, your fuel economy will suffer due to increase traction like this.

For look, it depends on your flavor. I personally think it doesn't flow with our IS. However, 315 tires can be one of a kind lol.

RVCAis250

Karasha is running a 305 tire in the rear.. but thats on her custom rocket bunny wide body build...

Sportskid1

iTrader: (1)

I think it wold be cheaper to buy a Vett that already has 315's in the rear. Lots of work will have to go into getting something that wide to fit into an IS.

Gville350

iTrader: (10)

Personally, I'd not see a need to go over a 285 tire; and even then, with the right 245 tire, you'll not even get them to spin on a hard launch. I know this isn't a "traction" issue, mainly for looks and rights; but at what cost?

Do what you will sir! I'll enjoy the pics regardless.

nikogio38

Update....ordered my new wheels went with 19x8.5 20 offset and 19x10.55 27 offset in the rear. Anyone chime in how wide of tire can I run in the front???? I was looking at 255 remember I’m have both front and rear fenders widened. I’m trying to keep the front and rear widths as close as possible as recommended. Info I’m either going with a 295 or 305 in the rear.