i need two new rear tires and i wanted to go a little wider. i have the stock 245-45-18 on stock wheels on the rear and also stock on front. i am lowered on eibach pro kit springs and have 25mm spacers in rear. i wanted to keep the front tires stock size but whats the widest i can go in the rear without rubbing issues?

 

275

 

I can go that wide with spacers and lowered?

 

Yea I'd say without rolling the fenders. The Eibach lowers you about an inch or so right?

Those 25mm spacers push you out a lot compared to stock.

 

My cousin work at Discount tire, said he did a z with 305/35 on stock rim with stock 20 space on stock susp for a old school guy. My guess it with the right back space you can fit in, Meassuring wise 275-305 is just little over 2" I have 305/30/20in +20 rims on mine, it fit nicely with stock susp. no fender roll, still have over a inch clearance, I thought I will have to roll, but guess not. as long as you don't let your 300lbs friend or GF in the car it fine. I tried going thru some bumpy and it handle well without touching it. hope this help.

 

Nobody has mentioned this, but fitting a 275 or wider tire onto a stock alloy is never a good idea. It's going to distort the actual contact patch of the tire and not allow it to work the way it was designed. Sure, you might get a local tire shop to shoehorn on the rubber, but you won't gain any performance advantage because of it. Plus, the sidewalls will be more susceptible to damage and you may be limiting the mileage of the tires themselves.