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      11-18-2019, 07:22 PM   #1
Catchmeifyoucanf90
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what size tires for stock 20" rims

I want to put 305/35/20 in the rear and then 285/35/20 , will that fit or cause problems. Also have any advice on what size or brand. I'm looking at Michelin pilot cup 2 sport
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      11-18-2019, 07:34 PM   #2
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I want to put 305/35/20 in the rear and then 285/35/20 , will that fit or cause problems. Also have any advice on what size or brand. I'm looking at Michelin pilot cup 2 sport
I run 295s rear and 285s front--no known issues after 4,000 miles. 305s will probably fit onto the rear wheels but it'll be a stretch both figuratively and literally (perhaps others that have done it can comment). My worry would be the tolerances of the Xdrive system between front and rear. I've spoken to folks offline who are running your proposed setup and have experienced oddities--tough to say whether it's the imbalance in the rolling circumference.

I run Michelin Pilot Spot 4Ss since I need a bit of wet-weather capability. I can't speak firsthand to the Cup 2s but reviews indicate they're amazing performance/track tires--perhaps overkill for road-only scenarios.

Last edited by limeypride; 11-18-2019 at 08:39 PM..
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      11-18-2019, 07:56 PM   #3
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i wouldnt change the ratio of tire size. if youre doing 305 rear the. you should check to see if you can fit 295 front.
or risk destroying your diff
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      11-19-2019, 01:22 AM   #4
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Yep, you need to keep the ratio as close as possible. You'll need 295 in the front.
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      11-19-2019, 06:35 PM   #5
Catchmeifyoucanf90
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What's a good price on these tires by the way?
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      11-19-2019, 06:38 PM   #6
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What's a good price on these tires by the way?
Long thread, lots of suggestions--which tires?
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      11-19-2019, 07:03 PM   #7
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Quote:
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Quote:
Originally Posted by Catchmeifyoucanf90 View Post
What's a good price on these tires by the way?
Long thread, lots of suggestions--which tires?
Michelin pilot cup 2 sport
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      11-19-2019, 07:20 PM   #8
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Quote:
Originally Posted by Catchmeifyoucanf90 View Post
I want to put 305/35/20 in the rear and then 285/35/20 , will that fit or cause problems. Also have any advice on what size or brand. I'm looking at Michelin pilot cup 2 sport
That's about a 1.8% + on circumference between front and rear versus 1.1% OEM. As long as you stay within 1%+/- from OEM you should be fine.

Been running 295/30/21 & 275/30/21 on my M5C for 6k miles w/ zero issues ... this setup is also +1.8%

Good luck
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      11-19-2019, 07:30 PM   #9
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Quote:
Originally Posted by Catchmeifyoucanf90 View Post
Michelin pilot cup 2 sport
If you're doing the SC2 in 20", the closest front to rear ratio to stock are the 285/30 and 305/30. Michelin doesn't make a 35 sidewall in either the 295 or 305, so you have to go almost an inch less in overall diameter compared to stock, but the ratio front to rear is still very close. Closer than the difference BMW allows for their winter tire combo of 285/40-19 and 265/40-19.

I just referred back to the email BMW sent out 11/1/19 which linked to their catalog recommendations for winter tire fitment. I wanted to confirm and they did specify the 285/40-19 and the 265/40-19 tire combination for winter use.

I hadn't considered the 295/30-20 SC2 for the front, but now I wonder if it would have fit? I'll have to check my clearances with the 285/30-20 at full lock to see if the wider 295 will actually work. I'll do that next time if it will. I do have aftermarket 10" front and 11" rear wheels.

Last edited by Used2be; 11-19-2019 at 08:13 PM..
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      11-19-2019, 07:59 PM   #10
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Quote:
Originally Posted by Used2be View Post
Quote:
Originally Posted by Catchmeifyoucanf90 View Post
Michelin pilot cup 2 sport
If you're doing the SC2 in 20", the closest front to rear ratio to stock are the 285/30 and 305/30. Michelin doesn't make a 35 sidewall in either the 295 or 305, so you have to go almost an inch less in overall diameter compared to stock, but the ratio front to rear is still very close. Closer than the difference BMW allows for their winter tire combo of 285/40-19 and 265/40-19.

I just referred back to the email BMW sent out 11/1/19 which linked to their catalog recommendations for winter tire fitment. I'm quite sure when I first looked at it there were two pages for the 2019 M5, now they aren't there! It stops at the M3/M4, very odd. They did specify the 285/40-19 and the 265/40-19 tire combination for winter use. Has something changed?

I hadn't considered the 295/30-20 SC2 for the front, but now I wonder if it would have fit? I'll have to check my clearances with the 285/30-20 at full lock to see if the wider 295 will actually work. I'll do that next time if it will. I do have aftermarket 10" front and 11" rear wheels.
The 265/40/19 and 285/40/19 setup is a +2.6% on circumference. I don't want to speculate but maybe that's a higher tolerance than they're willing to recommend .... just a thought.
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      11-19-2019, 08:09 PM   #11
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Quote:
Originally Posted by josec70 View Post
The 265/40/19 and 285/40/19 setup is a +2.6% on circumference. I don't want to speculate but maybe that's a higher tolerance than they're willing to recommend .... just a thought.
I went back and looked at the email again. I had clicked on the summer tire section, not the winter. The M5 is still listed with the 265/40-19 and 285/40-19 tire selection for the winter. Maybe sizing isn't as critical as we make it out to be? I'd like to know for sure!
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      11-19-2019, 08:12 PM   #12
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Quote:
Originally Posted by Used2be View Post
Quote:
Originally Posted by josec70 View Post
The 265/40/19 and 285/40/19 setup is a +2.6% on circumference. I don't want to speculate but maybe that's a higher tolerance than they're willing to recommend .... just a thought.
I went back and looked at the email again. I had clicked on the summer tire section, not the winter. The M5 is still listed with the 265/40-19 and 285/40-19 tire selection for the winter. Maybe sizing isn't as critical as we make it out to be? I'd like to know for sure!
I agree on the sizing .... even at +2.6% you should be fine more so if BMW is offering this setup.
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      11-19-2019, 08:41 PM   #13
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Quote:
Originally Posted by josec70 View Post
Quote:
Originally Posted by Used2be View Post
Quote:
Originally Posted by josec70 View Post
The 265/40/19 and 285/40/19 setup is a +2.6% on circumference. I don't want to speculate but maybe that's a higher tolerance than they're willing to recommend .... just a thought.
I went back and looked at the email again. I had clicked on the summer tire section, not the winter. The M5 is still listed with the 265/40-19 and 285/40-19 tire selection for the winter. Maybe sizing isn't as critical as we make it out to be? I'd like to know for sure!
I agree on the sizing .... even at +2.6% you should be fine more so if BMW is offering this setup.
Good info, guys—that's gonna be useful going forward.
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      12-12-2021, 07:41 AM   #14
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Quote:
Originally Posted by limeypride View Post
I run 295s rear and 285s front--no known issues after 4,000 miles. 305s will probably fit onto the rear wheels but it'll be a stretch both figuratively and literally (perhaps others that have done it can comment). My worry would be the tolerances of the Xdrive system between front and rear. I've spoken to folks offline who are running your proposed setup and have experienced oddities--tough to say whether it's the imbalance in the rolling circumference.

I run Michelin Pilot Spot 4Ss since I need a bit of wet-weather capability. I can't speak firsthand to the Cup 2s but reviews indicate they're amazing performance/track tires--perhaps overkill for road-only scenarios.
Is your front 285/35/20 and rear 295/35/20 on the OEM wheel that came with the car? Any noticeable difference in cornering?
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      12-12-2021, 08:56 AM   #15
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Quote:
Originally Posted by hjl113 View Post
Quote:
Originally Posted by limeypride View Post
I run 295s rear and 285s front--no known issues after 4,000 miles. 305s will probably fit onto the rear wheels but it'll be a stretch both figuratively and literally (perhaps others that have done it can comment). My worry would be the tolerances of the Xdrive system between front and rear. I've spoken to folks offline who are running your proposed setup and have experienced oddities--tough to say whether it's the imbalance in the rolling circumference.

I run Michelin Pilot Spot 4Ss since I need a bit of wet-weather capability. I can't speak firsthand to the Cup 2s but reviews indicate they're amazing performance/track tires--perhaps overkill for road-only scenarios.
Is your front 285/35/20 and rear 295/35/20 on the OEM wheel that came with the car? Any noticeable difference in cornering?
It was. Now I run that setup but with a 30% profile. Other than slightly less chirp during launches, it feels the same.
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      12-12-2021, 09:21 AM   #16
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Quote:
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It was. Now I run that setup but with a 30% profile. Other than slightly less chirp during launches, it feels the same.
Good to know that 285 can be safely put on 9.5 oem wheels.
Any reason to go from 35% profile to 30%?
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      12-12-2021, 01:39 PM   #17
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Quote:
Originally Posted by hjl113 View Post
Quote:
Originally Posted by limeypride View Post
It was. Now I run that setup but with a 30% profile. Other than slightly less chirp during launches, it feels the same.
Good to know that 285 can be safely put on 9.5 oem wheels.
Any reason to go from 35% profile to 30%?
Looks.
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