I am currently running a 275*60*15 nitto dr on the car and when i have anyone in the back seat or a heavy passenger the tires tend to rub over bumps etc. The tire is 27 3/4 in tall. I am goin to be running the 275/60/15 Mickey thompson dr which is a true 28inch tire. I was wondering how to clearance them so they wont rub going down the track and some street use. I already shaved down the rear bumper so i know they wont rub there, i was also told to cut the inner lip off the rear wheel well. Will cutting the lip off be enough so that they wont rub or will I have to do more. If anyone that has been through this before and could chime in on what they did that would be great. Sorry for the long post Thanks in advance.

 

I ran a Hoosier 28x11.5-15 that was 28.0" diameter. Wheel was 15x10 7.5" BS. It fit with no alterations at all, beyond what I had already done to fit 315/35-17 BFG DR's on 17x11 50mm offset wheels. Those alterations included cutting the edge off the jounce bumper bracket, hammering the inner fender liner, and rolling the inside edge of the fender lip up.

There was no interference, until trap speeds went over 125MPH. Then the growth put the front of the tire tread into the sheet metal at the front of the wheel opening. I moved the rear axle back about 1/4" with a set of adjustable LCA's and the problem went away. I am running Eibach Darg Launch springs, and the back of the car sits about 1/2" taller than stock, so that might also be helping keep the body away from the tires.

I've switched to an ET Drag 28x10.5-15W, which is supposed to be 28.1" diameter, but it wouldn't even fit in the wheel opening. I ended up taking about 1.5" off the edge of the rubber bumper cover and pounding the sheet metal back behind the cover. We ran it up to about 130MPH on the dyno, and still had some minor contact on one side, with the tire and the sheetmetal under the rubber bumper cover, so I pounded it some more.

A "drag radial" shouldn't experience as much growth at high speeds. You should be OK, if it really is a 28.0" diameter tire. Just watch carefully for rubbing as you start to elevate the trap speeds. Maybe run it in increments of 5mph, starting at 100mph to look for contact.