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      12-21-2016, 05:38 AM   #1
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Increasing tire size from 245/265 to 255/275: any cons ?

Thinking about putting some winter tyres on stock rims. Would 10mm wider fit? There are more choice.

Thanks.
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      12-21-2016, 07:56 AM   #2
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Yes, they'll fit without any issues.
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      12-21-2016, 08:15 AM   #3
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Thank you
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      12-28-2016, 01:44 PM   #4
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will that small difference in diameter throw off the ESP, diff, speedometer?
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      12-28-2016, 03:10 PM   #5
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Quote:
Originally Posted by fusion0389 View Post
will that small difference in diameter throw off the ESP, diff, speedometer?
Why would the diameter change at all?
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      12-28-2016, 03:28 PM   #6
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Quote:
Originally Posted by fusion0389 View Post
will that small difference in diameter throw off the ESP, diff, speedometer?
255/275 refers to width of the tire.
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      12-28-2016, 06:50 PM   #7
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Why did BMW not make the stock widths 255/275, I wonder?? I also wonder whether I could fit those on the stock wheel with a one-inch drop and 10 mm spacers....

I've got Contis, and I am going to beat those babies up so that by summer I can bullshit myself into thinking I need new tires
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      12-28-2016, 07:15 PM   #8
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Quote:
Originally Posted by zenmaster View Post
Why would the diameter change at all?
Assuming the same profile, an increase in width also brings a corresponding increase in sidewall height.

35 series tyre. 10mm more width = 2x3.5mm = 7mm increase diameter.

And to answer the previous question....no it won't cause issues with DSC or LSD function. There will be a minor change in speedo which will more likely then not make it closer to a true reading. With the OEM MPSS tyres, 100kph indicated equals 98kph GPS.

That's the theory. In reality, different brands and models of tyre may or may not measure exactly what is printed on the sidewall. YMMV......literally.

Last edited by Caduceus; 12-28-2016 at 07:23 PM..
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      12-28-2016, 07:37 PM   #9
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Quote:
Originally Posted by Caduceus View Post
Assuming the same profile, an increase in width also brings a corresponding increase in sidewall height.

35 series tyre. 10mm more width = 2x3.5mm = 7mm increase diameter.

And to answer the previous question....no it won't cause issues with DSC or LSD function. There will be a minor change in speedo which will more likely then not make it closer to a true reading. With the OEM MPSS tyres, 100kph indicated equals 98kph GPS.

That's the theory. In reality, different brands and models of tyre may or may not measure exactly what is printed on the sidewall. YMMV......literally.
I always thought the diameter remained constant, regardless of the aspect ratio / sidewall length.
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      12-29-2016, 06:45 AM   #10
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Quote:
Originally Posted by nd2002 View Post
255/275 refers to width of the tire.
Yes and no... The diameter of the tire changes even when the only parameter changed is the width. So yes, 255, 275, refers to the width of the tire, that is understood. However increasing the width of the tire from 245 to 255 or 265 to 275 does increase the overall diameter of the tire. I took a snapshot of the differences between Michelin Pilot Super Sports. The top one is stock tire size and the bottom is one size. As you can see yes the tires are most definitely wider as expected, however overall diameter has also increased along with a change in revs per mile which will throw off your speedometer, odometer, and possibly ESP depending on what parameters the program monitors. If BMW has a way to manually change the revs per mile in the M2's computer, that will ensure the car is operating as it should with the modified tire size. Obviously, the difference is small, I would hope the BMW programming would be forgiving with such a small difference in diameter and smart enough to compensate appropriately.
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      12-29-2016, 11:56 AM   #11
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And the sizes 255/275/35/19 are compatible with the Coilovers???

Any experience??

I'm thinking to put this sizes on a BBS CI-R et 25 and 35 with a Kw V3...
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      12-29-2016, 06:28 PM   #12
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You will need to test fit anything other than stock sizes. I am putting MP coilovers on my M2 next week, lowering the car, changing the rake and then corner balance.....then check clearances again to see what will fit. Remember that all 255/275 are not created equal....tires can vary a lot between different manufacturers. Also, front camber will effect fit.
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      12-30-2016, 07:19 PM   #13
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I dug around the forums like crazy a few months ago to answer this question. There was actually a guy that went 265's in the front and 285's in the rear and had no issues. That is the route I will be going, no spacers.
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      12-30-2016, 08:33 PM   #14
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Quote:
Originally Posted by zenmaster View Post
I always thought the diameter remained constant, regardless of the aspect ratio / sidewall length.
Diameter (of the rim), yes. Circumference, no.

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      12-30-2016, 11:57 PM   #15
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Quote:
Originally Posted by Norcalmav23 View Post
I dug around the forums like crazy a few months to answer this question. There was actually a guy that went 265's in the front and 285's in the rear and had no issues. That is the route I will be going, no spacers.
I would make sure to stick with the same brand and model tire. Rock on..
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      12-31-2016, 01:04 PM   #16
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Quote:
Originally Posted by chrismac View Post
Thinking about putting some winter tyres on stock rims. Would 10mm wider fit? There are more choice.

Thanks.
I'm running 265/35 r19 winters up front and square. It's fine...I think the rule of thumb is if you want 275's up front you'll want a 10" wheel so the sidewall leans in a bit and camber plates.

I've had 265,275's mounted on the front. The 275's won't rub with a 30 sidewall. They tend to rub on the plastic liners first. So a 275/30 would actually be a better fit then than a 265/35. I'll be going 265/35 up front because I want that extra sidewall. I don't mind a little liner rub.

Out back a 285 makes the most sense. I'm thinking there's no reason why a 295 wouldn't fit or even a 305 with the right offset. I had 315/30 Hoosier r7 slicks mounted and they are too pudgy with a 10" wheel. Anything bigger than a 295 you'll have to be exact with your measurements and offsets. More suited to a high offset 10.5 or 11
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      01-01-2017, 12:48 PM   #17
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Quote:
Originally Posted by chrismac View Post
Thinking about putting some winter tyres on stock rims. Would 10mm wider fit? There are more choice.

Thanks.
I could be wrong, but wouldn't you want NARROWER tires for the winter?

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      01-01-2017, 06:06 PM   #18
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Quote:
Originally Posted by pup73 View Post
Quote:
Originally Posted by chrismac View Post
Thinking about putting some winter tyres on stock rims. Would 10mm wider fit? There are more choice.

Thanks.
I could be wrong, but wouldn't you want NARROWER tires for the winter?

-c
Correct I couldn't find decent sizes, couldn't pass up the 265's
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      01-02-2017, 12:11 AM   #19
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Quote:
Originally Posted by ashburyn54 View Post
I'm running 265/35 r19 winters up front and square.
What brand of tires and wheel offset? Suspension mods? How much rub if any? Sorry for all the questions but am very interested in doing this. I have about -3 camber and would like to put on ET27 or 25 offsets with 265/35s.
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      01-02-2017, 04:49 PM   #20
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Quote:
Originally Posted by Pyrat 2 View Post
Quote:
Originally Posted by ashburyn54 View Post
I'm running 265/35 r19 winters up front and square.
What brand of tires and wheel offset? Suspension mods? How much rub if any? Sorry for all the questions but am very interested in doing this. I have about -3 camber and would like to put on ET27 or 25 offsets with 265/35s.
-3 camber up front? If that's the case you can run a 275/30, a 265 won't be an issue. Suspension is H&R sports. 12mm spacers up front and 7mm out back on stock wheels. No camber plates yet so stock camber. Tire brand is Bridgestone, they are winters so the tread adds some height I assume.

When I have my wheels built it'll be close to those specs. 19x10 square et 32-36, haven't decided yet but I'll be running them with the spacers since they won't have centercaps, the turner hub-extenders hide the hub rust when running Open lug racing wheels.

So final specs with spacers will be right around 19x10 et 22-25 front and et 28 rear. I still have a little room out back with this setup and camber plates up front would give me 5mm or so of extra wiggle room.
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      01-03-2017, 12:12 AM   #21
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Quote:
Originally Posted by zenmaster View Post
I always thought the diameter remained constant, regardless of the aspect ratio / sidewall length.
No, unfortunately it does not. Plug some in here and check:

http://www.1010tires.com/Tools/Tire-Size-Calculator

The overall diameter increases with every step up in width. For 245->255 the difference is not really going to disturb anything though. Once you get 20 or more away you should see if dropping the aspect ratio brings you closer to the stock diameter.
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      01-07-2017, 11:05 AM   #22
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Quote:
Originally Posted by ashburyn54 View Post
-3 camber up front? If that's the case you can run a 275/30, a 265 won't be an issue. Suspension is H&R sports. 12mm spacers up front and 7mm out back on stock wheels. No camber plates yet so stock camber. Tire brand is Bridgestone, they are winters so the tread adds some height I assume.

When I have my wheels built it'll be close to those specs. 19x10 square et 32-36, haven't decided yet but I'll be running them with the spacers since they won't have centercaps, the turner hub-extenders hide the hub rust when running Open lug racing wheels.

So final specs with spacers will be right around 19x10 et 22-25 front and et 28 rear. I still have a little room out back with this setup and camber plates up front would give me 5mm or so of extra wiggle room.
Thanks! Helpful.
Wanting 265/35 instead of 275/30 because I'm looking for some extra rubber between the ground and the wheel. My concern has been rubbing with the fender liner in front near the inlet duct. Clearance is very tight even with the stock wheels when they are turned and I want to make sure that the larger diameter doesn't rub there. I'm not concerned about inner rub with the strut or outer rub with the fender (because of my camber).
I too will be going with the Turner extenders. My wheel on order are 35 offset and was looking at either the 7.5 to 10mm extenders giving me a 27.5 or 25 offset. My rear offset will be 35 with a 265 or 275/35-19 tire.
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