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The Tire Rack's Tire & Wheel Forum
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Old 07-13-2014, 07:16 PM   #1
serdar255
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Exclamation Fitting 275 Square tires on my Non-M coupe

This past years I've logged a lot of autox hours and track time. I want to know what it would take for me to run 275 square tires on my non M coupe.

Currently I am running 255/35/18 Pilot Super Sports on my 18x8.5 et40 Enkei RPF1s and I feel that I still have a bit of room to play. Is it possible that I can fit 275s on an 18x9 (Dforce LTW5) or 18x9.5 (Apex ARC-8) with nothing more than a fender roll/cut? If not what would be required?

Thanks!
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Last edited by serdar255; 07-13-2014 at 07:16 PM.
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Old 07-13-2014, 08:19 PM   #2
Rob43
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Unfortunately you're in uncharted territory, I can't remember anyone running that size on a Non M. Hopefully I'm wrong & someone will speak up.

If you can make them fit, I have two other concerns:

1) Your current overall diameter is 25", this new size will be 25.6"; are you planning on a gear change ? because you'll need one.

2) Even though Tire Rack shows them as the same weight, I can assure you that the bigger tire weighs more, probably a 1/2 to 2/3 lbs more.

I'd try and figure out your current Exact tire & wheel weight, then compare it to your new proposed tire & wheel weight.

Sometimes the Cons equal or outweigh the Pros, meaning in this case it might not workout the way you think it will.


Good luck,
Rob43
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Old 07-13-2014, 10:38 PM   #3
serdar255
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Quote:
Originally Posted by Rob43 View Post
Unfortunately you're in uncharted territory, I can't remember anyone running that size on a Non M. Hopefully I'm wrong & someone will speak up.

If you can make them fit, I have two other concerns:

1) Your current overall diameter is 25", this new size will be 25.6"; are you planning on a gear change ? because you'll need one.

2) Even though Tire Rack shows them as the same weight, I can assure you that the bigger tire weighs more, probably a 1/2 to 2/3 lbs more.

I'd try and figure out your current Exact tire & wheel weight, then compare it to your new proposed tire & wheel weight.

Sometimes the Cons equal or outweigh the Pros, meaning in this case it might not workout the way you think it will.


Good luck,
Rob43

I appreciate the insight.

By the looks of it the tire and wheel will be the same weight that i have currently because the tire is 2 lbs more but the wheel is about 2 lbs less.

As far as a gear change I was looking into a limited slip and with that I'd be willing to change ratio.
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Old 07-13-2014, 11:08 PM   #4
Rob43
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Quote:
Originally Posted by serdar255 View Post
I appreciate the insight.

By the looks of it the tire and wheel will be the same weight that i have currently because the tire is 2 lbs more but the wheel is about 2 lbs less.

As far as a gear change I was looking into a limited slip and with that I'd be willing to change ratio.
That's all good, but I want you to think about overall tire & wheel weight a different way.

1) If All (100%) of the un-sprung weight was located right around the wheel bearings, that would be the very best case scenario.
2) On the other hand, if All (100%) of the un-sprung weight was located on the tread surface that would be the worse case scenario.

In your case, your new setup is closer to scenario #2. It's good that the overall weight will remain the same, but it is a performance "Con" because you're now shifting that weight out to the tread surface.


EDIT: Don't make the mistake of buying a Helical LSD, you need a Clutch Pack.

Things to consider,
Rob43
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Quote:
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!

Last edited by Rob43; 07-13-2014 at 11:26 PM.
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Old 07-14-2014, 12:06 AM   #5
serdar255
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Quote:
Originally Posted by Rob43 View Post
That's all good, but I want you to think about overall tire & wheel weight a different way.

1) If All (100%) of the un-sprung weight was located right around the wheel bearings, that would be the very best case scenario.
2) On the other hand, if All (100%) of the un-sprung weight was located on the tread surface that would be the worse case scenario.

In your case, your new setup is closer to scenario #2. It's good that the overall weight will remain the same, but it is a performance "Con" because you're now shifting that weight out to the tread surface.


EDIT: Don't make the mistake of buying a Helical LSD, you need a Clutch Pack.

Things to consider,
Rob43

Never thought of that... I appreciate the info and still have a lot to learn. So keep it coming!


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Old 07-14-2014, 03:06 PM   #6
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I run r888's in 255/35/18 which are 10.236 inches in width.

A 275/35/18 super sport is only 10" wide according to tirerack website.

I use arc-8 18" wheels with no spacers. Rears were rolled for fitment and running -2.0 camber. No issues with front wheel fitment but I run -3.0 camber up front.


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Old 07-17-2014, 07:15 PM   #7
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Seems like a hell of a lot of rubber for a little wheel. I have 255 on my rear 10.5 wheel. About 8 hours of rolling and grinding/cambering just to make it rub a little less. A 275 won't look great on a 9 in my opinion. Not to mention your car has absolutely no use for a 275 section. We have 235 horsepower. 255 tire is plenty. If you want better grip, don't get wider. Get a better tire.
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Old 07-17-2014, 08:06 PM   #8
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tire size and spacer question. clearance issue

edited...meant to make a thread.

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Old 07-17-2014, 08:20 PM   #9
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Thread jack. And roll the fenders. You'll be fine

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Old 07-17-2014, 08:56 PM   #10
Minnoe07
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255 is recommended for an 8.5 in wide tire and comes that way from BMW.

255 on a 10.5 is a bit of a stretch.


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Old 07-17-2014, 09:31 PM   #11
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I know it is. Rubbed extrmely with a 265

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Old 07-18-2014, 01:36 AM   #12
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Personally I'd just pickup a good, lightweight set of 17" wheels with track tires (255 square setup) and call it done. I doubt the 275 width would be worth the hassle or additional weight.
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Old 07-18-2014, 01:37 AM   #13
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Well said

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