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Old 10-21-2012, 05:04 AM   #1
Peter2001SS
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Rear tire size can i change to?

I just bought a set of wheels yesterday they are staggered wheel 18x8 with 245 40 on the front and have no problems there. On the rear they are a 18x9.5 but with a 275 40 on them which I do have a big problem with fender rub on them. I have a stock suspension 2004 and fenders aren't rolled or cut. What size tire would I need to change to on the rear to stop this from happening? The guy I bought them from had them on his 04 gto with no problems, but he didn't know if his suspension was stock.....I guess it wasn't.

Thanks for your help.
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Old 10-21-2012, 05:07 AM   #2
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265/35's

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Old 10-21-2012, 06:40 AM   #3
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Quote:
Originally Posted by Peter2001SS...View Post
I just bought a set of wheels yesterday they are staggered wheel 18x8 with 245 40 on the front and have no problems there. On the rear they are a 18x9.5 but with a 275 40 on them which I do have a big problem with fender rub on them. I have a stock suspension 2004 and fenders aren't rolled or cut. What size tire would I need to change to on the rear to stop this from happening? The guy I bought them from had them on his 04 gto with no problems, but he didn't know if his suspension was stock.....I guess it wasn't.

Thanks for your help.

usually you would run 245/40R18 on the front and 275/35R18 on the back. 275/40 is too tall to begin with, but even with 275/35 you can still get some rubbing.
Rear springs, air bags, or trimming/rolling the rear quarters, you are probably going to have to do something to get these to fit without rubbing.
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Old 10-21-2012, 06:56 AM   #4
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my 275/40s are rubbing with cut fenders and air bags with under 15lbs of pressure. i have to jack up the air bags to keep it from rubbing.

i cant wait to burn these up so i dont have to drive around like a 4x4...
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Old 10-21-2012, 07:13 AM   #5
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Quote:
265/35's

If he's rubbing hard with 275s, I doubt 5 less mm will help.

OP, might want to roll your fenders then.
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Old 10-21-2012, 07:31 AM   #6
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What are the wheel offsets?

I would recommend rolling/cutting the fenders for sure as others have mentioned. Drag bags would help also..
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Old 10-21-2012, 07:39 AM   #7
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I had 275/35/18 tires, and they didn't rub all that often. They usually hit the fenders only on nasty bumps (which I try to avoid).

I then upgraded to 275/40 tires, and they rubbed like crazy. I rolled my fenders and installed pedders 0" drop springs. Problem solved.

Rims I have on the back are 18x9.5, with a 46mm offset.
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Old 10-21-2012, 03:07 PM   #8
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Originally Posted by redtan...View Post
If he's rubbing hard with 275s, I doubt 5 less mm will help.

it's not just the width of the tire you need to think about....
a 275/40 has an O.D. of 677mm (26.65")....a 265/35 has an O.D. of 643mm (25.31")....a difference between the 2 tires of 1.4 inches on the diameter...thats where the problem is....along witht he fact the tire is 10 mm wider than a 265...
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Old 10-21-2012, 06:45 PM   #9
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OP why not fix the car to where they fit instead of running the wrong size tire?
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Old 11-01-2012, 09:47 AM   #10
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Originally Posted by o'doyle...View Post
What are the wheel offsets?

I would recommend rolling/cutting the fenders for sure as others have mentioned. Drag bags would help also..

Its a 40mm offset on the rear wheels. Can drag bags be used all the time?
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Old 11-01-2012, 09:54 AM   #11
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These are the new wheels with the tires that rub the fenders. I haven't had a chance to try the 265/35/18 as suggested yet. I have been back to using the stock wheels until I do that.
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Old 11-01-2012, 01:00 PM   #12
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Originally Posted by Peter2001SS...View Post
Its a 40mm offset on the rear wheels. Can drag bags be used all the time?

Drag bags are sort of a crutch for not using the correct springs, and help dampen spring harmonics. They can help stop wheel hop and raise the ride height a little, but you shouldn't rely on them to support the entire rear of the car.
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Old 11-01-2012, 01:36 PM   #13
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Originally Posted by high school goat...View Post
OP why not fix the car to where they fit instead of running the wrong size tire?

He's currently running the wrong size. He needs to drop down to a 35-series profile. 275/35 should be fine, but 265/35 would be even better.
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Old 11-01-2012, 01:39 PM   #14
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Quote:
Originally Posted by Peter2001SS...View Post
I just bought a set of wheels yesterday they are staggered wheel 18x8 with 245 40 on the front and have no problems there. On the rear they are a 18x9.5 but with a 275 40 on them which I do have a big problem with fender rub on them. I have a stock suspension 2004 and fenders aren't rolled or cut. What size tire would I need to change to on the rear to stop this from happening? The guy I bought them from had them on his 04 gto with no problems, but he didn't know if his suspension was stock.....I guess it wasn't.

Thanks for your help.

Honestly if you already have the 275's why not just grab some drag bags, and get your fenders rolled. Drag bags will help at the track too as will the 275's so you're winning both ways.
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Old 11-01-2012, 01:56 PM   #15
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Originally Posted by Hockeyman...View Post
......I then upgraded to 275/40 tires...

Is this truly an "upgrade"? With the higher aspect ratio, will the speedo need to be recalibrated?

IMHO 265/35 or 275/35 would be the size to get. More often than not, a 275/35 will require some sort of minor rear modification to eliminate fender rub. Since you already have 275/40, I would invest in drag bags until you burn off the tires and then get the correct size. As mention by someone earlier, it's not just the width, but also the additional height over the stock size.
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Old 11-01-2012, 02:16 PM   #16
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Quote:
Originally Posted by Doric...View Post
He's currently running the wrong size. He needs to drop down to a 35-series profile. 275/35 should be fine, but 265/35 would be even better.

This is true but even with the smaller tires its going to be tight with the 40 offset. OP get new springs and roll your fenders.
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Old 11-01-2012, 02:21 PM   #17
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Id start with grinding the fender lips off.

Easy and cheap.
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Old 11-01-2012, 02:23 PM   #18
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40 offset will not work for the rear. For that wide of a rim you need at least a 45 offset. With that offset like stated above a 265/35 or depending on the brand of tire possibly a 275.
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Old 11-01-2012, 02:56 PM   #19
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You will need to get your rear guards rolled!

I run 275/30/19's on 19" x 9.5" ET40.
These fitted with the rolled guards but I decided to have the back of the wheel mounting face machined down 3mm which effectively makes them ET43 now.
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Old 11-01-2012, 04:21 PM   #20
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Lot of different advice, but at the end of the day you have the wrong parts on your car
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Old 11-01-2012, 04:35 PM   #21
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Lot of different advice, but at the end of the day you have the wrong parts on your car

That's subjective.
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Old 11-01-2012, 04:46 PM   #22
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So is the rest of the advice
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Old 11-01-2012, 06:50 PM   #23
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"You have the wrong parts" isn't advice. It's your opinion and isn't going to help the OP in any way whatsoever. It'll be easy enough to make his wheels work, so no they aren't "the wrong parts".
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Old 11-04-2012, 04:05 PM   #24
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Difference between a 17, 18, and 19 rubbing is amazing. My 275 40 17's touch nothing with a spongy 8 lbs in the bags, no roll and stock cushions...
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Old 11-05-2012, 06:09 PM   #25
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I'm running 275/40/18 on the rear, 9.5" wheel +52 offset. The car is lowered about 1/2" and the only place it rubs is on the inside rear plastic splash thing when you go over a big bump. It doesn't hurt anything. I have cut off some of the plastic, just not enough. No drag bags. I don't like the 35 series tires. Fronts are 8" +46 with 245/40, no rubbing. The wheel offset is the key if you don't want to jack up your car.
If you want to keep the wheels, just choose a smaller tire.

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Old 11-06-2012, 05:32 PM   #26
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Old 11-12-2012, 09:38 AM   #27
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I have the right size tires on the wheels now, using the 265/35/18. I put some tape on the rear fender lips and took it for a drive. It still rubs sometimes but nothing like it did before. This was a great improvement. I of course dont want it to rub at all and not sure what my next step will be. Whether it will be to change the offset to 43 or 45 or to roll or grind the fender lip. I drive it thru the winter and wonder if doing anything to the fender like that if it will cause an area that will be prone to start rusting which I definitely don't want to happen.
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Old 11-25-2012, 05:54 PM   #28
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I have the right size tires on the wheels now, using the 265/35/18. I put some tape on the rear fender lips and took it for a drive. It still rubs sometimes but nothing like it did before. This was a great improvement. I of course dont want it to rub at all and not sure what my next step will be. Whether it will be to change the offset to 43 or 45 or to roll or grind the fender lip. I drive it thru the winter and wonder if doing anything to the fender like that if it will cause an area that will be prone to start rusting which I definitely don't want to happen.

OFFSET IS KEY!!! no need to start cutting your ride up!!!
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Old 11-27-2012, 09:39 AM   #29
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OFFSET IS KEY!!! no need to start cutting your ride up!!!

That's definitely what I want to change, just dont know where to go to get the wheel offset machined to the right offset. I was hoping to find something local so wouldn't have to ship them.
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Old 11-28-2012, 09:23 AM   #30
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Drag bags are sort of a crutch for not using the correct springs, and help dampen spring harmonics. They can help stop wheel hop and raise the ride height a little, but you shouldn't rely on them to support the entire rear of the car.

At this point I will probably wait til spring to do this, but what springs/shocks would be good to keep from getting any fender rub? Would the Pedders 0 drop be a good choice or are there others that would work as well? I didnt realize until I got these wheels how much the rear of the car pulls down on acceleration. It would be nice to not have wheel hop anymore too.
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