[doughboy]

Clearance is very tight on M2C.

Different makes of the same size have different shoulder profiles and may rub even near standard size. I recall this with my old 335i, lowering with one tyre size ok, then a different make tyre of the same size would rub..

Winters in my experience have "broad" shoulders with tread extension further over onto the sidewall edge.

Perhaps staying at OE size or even going down to 235 would have been better?

[///AVM]

Originally Posted by doughboy

Clearance is very tight on M2C.

Different makes of the same size have different shoulder profiles and may rub even near standard size. I recall this with my old 335i, lowering with one tyre size ok, then a different make tyre of the same size would rub..

Winters in my experience have "broad" shoulders with tread extension further over onto the sidewall edge.

Perhaps staying at OE size or even going down to 235 would have been better?

Doughboy

I am here to support your post, even though I openly admit no special insight on my part.

The basis of my support lies with the 'broad shoulder' statement you made. The PSS is very round compared to the tires BigKutta purchased. . . . suggesting to me it is the tires and not the wheels.

///AVM

[BigKutta]

Originally Posted by doughboy

Clearance is very tight on M2C.

Different makes of the same size have different shoulder profiles and may rub even near standard size. I recall this with my old 335i, lowering with one tyre size ok, then a different make tyre of the same size would rub..

Winters in my experience have "broad" shoulders with tread extension further over onto the sidewall edge.

Perhaps staying at OE size or even going down to 235 would have been better?

Yeah perhaps. These tires came with the wheels and were used on an M4 previously. The tires are good for a season for sure so I decided to keep, kinda glad I didn't get new tires because I did want to test the bigger size. Next round I'll stick to 245 fronts and 275s rear.

[BigKutta]

Originally Posted by ///AVM

Doughboy

I am here to support your post, even though I openly admit no special insight on my part.

The basis of my support lies with the 'broad shoulder' statement you made. The PSS is very round compared to the tires BigKutta purchased. . . . suggesting to me it is the tires and not the wheels.

///AVM

I agree. See the pics I posted of my PSS on 788: put away for the winter. As soon as I put them there I thought about how much skinnier they look compared to the Pirellis on the 437. The rubbing isn't too bad, only when I pull out of a parking space with a tight turn. I may have to live with it until I get 245s up front. Will keep 275s in the back. Looks really good compared to stock.

[BigKutta]

Originally Posted by ///AVM

Kutta

If you had bought from unknown seller (e.g., eBay), then I would question authenticity and size of the wheels . . . which could explain the fitment mystery.

Anyway, you seem to have bought from a trustworthy seller. . . wonder where he bought the wheels?

///AVM

I have no doubt these are genuine. But one can never know for sure, right? The seller bought these from an M3 owner. The set has basically been a winter set for everyone. I met the seller and had my daughter not been along for the ride, we may have had a few beers in his garage as we talked about M cars😃.

A lot of posts here are pointing to a fender liner in the comp that leaves a lot less room, I just never imagined that one size up on winters would cause an issue.

[VisualEcho]

Originally Posted by doughboy

Winters in my experience have "broad" shoulders with tread extension further over onto the sidewall edge.

That's why we quote tread width (the actual shoulder), not size. It's also why his experience makes no sense.

Stock 245/35 MPSS: 8.8 TW, 25.8 OD
Sottozero 255/35/19: 8.3 TW, 26 OD

So the SHOULDER is .5 (12.7mm, 6.35 on each side) narrower, but .1 (2.54mm on the top side) taller.

This tire should fit EASIER than the stock tire.

So either tirerack's specs are wrong, or something else is off. If both are correct, and the rub exists over 2.5mm, the vehicle should come with a damn warning tag stating that you can't even change tires without the possibility of rubbing. Which is, well, stupid.

[///AVM]

Originally Posted by VisualEcho

That's why we quote tread width (the actual shoulder), not size. It's also why his experience makes no sense.

Stock 245/35 MPSS: 8.8 TW, 25.8 OD
Sottozero 255/35/19: 8.3 TW, 26 OD

So the SHOULDER is .5 (12.7mm, 6.35 on each side) narrower, but .1 (2.54mm on the top side) taller.

This tire should fit EASIER than the stock tire.

So either tirerack's specs are wrong, or something else is off. If both are correct, and the rub exists over 2.5mm, the vehicle should come with a damn warning tag stating that you can't even change tires without the possibility of rubbing. Which is, well, stupid.

Visual

One thing I have learned is that when you and Poochie start getting technical about things it is time for me to listen . . . so, am I hearing you correctly in thinking the tires are not the problem and we are back to square one in trying to solve this mystery?

///AVM

[team_car]

I'm about to swap to the same wheels and same size tire, but a Michelin Alpin. Will see how it goes!

[VisualEcho]

Originally Posted by ///AVM

Visual

One thing I have learned is that when you and Poochie start getting technical about things it is time for me to listen . . . so, am I hearing you correctly in thinking the tires are not the problem and we are back to square one in trying to solve this mystery?

///AVM

I can't imagine it's the wheels. It has to be incorrect specs for the tire coupled with less room on the M2C liner.

[BigKutta]

Originally Posted by team_car

I'm about to swap to the same wheels and same size tire, but a Michelin Alpin. Will see how it goes!

When? Will be curious to hear your experience as that's a tire I'll consider for next winter season. I do like the added width and height.

[AndrewC1989]

Originally Posted by VisualEcho

I can't imagine it's the wheels. It has to be incorrect specs for the tire coupled with less room on the M2C liner.

+1

[BigKutta]

So any issues with mild rubbing, either on the liner or the tire? I know it's not desirable, but just wondering if it'll cause any issues if I keep the tires on for 3 months.

[AndrewC1989]

Originally Posted by BigKutta

So any issues with mild rubbing, either on the liner or the tire? I know it's not desirable, but just wondering if it'll cause any issues if I keep the tires on for 3 months.

Shouldn't be an issue in the front. Eventually, the tire will wear the liner down a tad and it'll stop making noise lol.

Rubbing in the rear is a whole nother can of worms as there is some metal back there you have to watch out for:

https://f87.bimmerpost.com/forums/sh....php?t=1780655

[BigKutta]

Originally Posted by AndrewC1989

Shouldn't be an issue in the front. Eventually, the tire will wear the liner down a tad and it'll stop making noise lol.

Rubbing in the rear is a whole other can of worms as there is some metal back there you have to watch out for:

https://f87.bimmerpost.com/forums/sh...php?p=26987074

Awesome thanks. I can live with this for a bit. No rubbing in the rear.

[team_car]

Originally Posted by BigKutta

When? Will be curious to hear your experience as that's a tire I'll consider for next winter season. I do like the added width and height.

Hopefully this week. I'm local(ish) to you. I'll let you know how it goes.

[BigKutta]

Originally Posted by team_car

Hopefully this week. I'm local(ish) to you. I'll let you know how it goes.

Thanks please do. Assume you have a Comp, not OG?

[m2compred5]

Originally Posted by BigKutta

Yes, but no one has complained about rubbing with the tire size. I can't be the first M2C that has this wheel / tire size combo. Either way the difference in height is 3.5 mm (going from 245 to 255 in the front.

I am having a similar experience with my new Michelin pilot alpin pa4 xl’s
I noticed it the first time I backed out while turning the wheel. These are the same sizes as the stock tires. I did notice the edges of the stock tires have a bit of a radius on the outer edges as compared to the winter performance tire which is much more angular and square. I suspect that change in profile is the cause. It does not happen often enough to irritate me but it’s there. I should note the tires were mounted on my stock wheels.

[BigKutta]

Originally Posted by m2compred5

I am having a similar experience with my new Michelin pilot alpin pa4 xl’s
I noticed it the first time I backed out while turning the wheel. These are the same sizes as the stock tires. I did notice the edges of the stock tires have a bit of a radius on the outer edges as compared to the winter performance tire which is much more angular and square. I suspect that change in profile is the cause. It does not happen often enough to irritate me but it’s there. I should note the tires were mounted on my stock wheels.

Interesting. And I think you describe the issue exactly as I see it. The PSS tires are must more rounded off on the edges and the pirellis are more square edge (less radius as you say). But if the OEM size that you used is causing an issue, then we've go a big problem for anyone trying to change tires. I'm surprised this issues hasn't cause more of an uproar. Is everyone living with the rubbing?!?

[Brokenbones]

Huh that’s suboptimal clearance especially after snow and slush buildup. Guess I’m glad I went for narrower 235 winters...

Did see the guys post on bending the wheel arch plastic away, really smart.

[veenut28]

Originally Posted by BigKutta

Interesting. And I think you describe the issue exactly as I see it. The PSS tires are must more rounded off on the edges and the pirellis are more square edge (less radius as you say). But if the OEM size that you used is causing an issue, then we've go a big problem for anyone trying to change tires. I'm surprised this issues hasn't cause more of an uproar. Is everyone living with the rubbing?!?

Same tires, same issues with rubbing for me as well. It happens at full lock when reversing. Otherwise I haven't noticed it.

(PA4s in stock size with stock suspension)

[team_car]

Originally Posted by BigKutta

Thanks please do. Assume you have a Comp, not OG?

correct

[BigKutta]

Originally Posted by Brokenbones

Huh that’s suboptimal clearance especially after snow and slush buildup. Guess I’m glad I went for narrower 235 winters...

Did see the guys post on bending the wheel arch plastic away, really smart.

I did, but I shouldn't have to take a blow torch to my M2 to put in a 10mm wider tire... Knowing my luck, I'll fry/melt something on the other side