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      10-18-2020, 12:55 AM   #1
Skyman2345
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Widest tires possible?

Doing a full engine build on my M5 and was wondering what’s the fattest PS4 or R888 I can fit front and rear? Also don’t want any dsc issues of course!
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      10-18-2020, 07:03 AM   #2
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Quote:
Originally Posted by Skyman2345 View Post
Doing a full engine build on my M5 and was wondering what’s the fattest PS4 or R888 I can fit front and rear? Also don’t want any dsc issues of course!
I can't help you there, but I'd like to know.

Those RS3's really move with a tune (your signature)
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      10-20-2020, 11:20 PM   #3
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I am running 295/35 and 305/35 on mine.
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      10-20-2020, 11:58 PM   #4
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I'm running

285/35/20 4s
305/35/20 4s

That's the max I would say so the ride height is within specs and speedometer is spot on.
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      10-21-2020, 01:01 PM   #5
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Quote:
Originally Posted by GTATX View Post
I'm running

285/35/20 4s
305/35/20 4s

That's the max I would say so the ride height is within specs and speedometer is spot on.
Just an FYI, the stock tires are 275/285 and are 1.1% difference in height.

Your 285/305 is 2% difference.

295/305 is 1.1% difference, exactly like stock.
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      10-21-2020, 01:03 PM   #6
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Quote:
Originally Posted by Higgs Boson View Post
Quote:
Originally Posted by GTATX View Post
I'm running

285/35/20 4s
305/35/20 4s

That's the max I would say so the ride height is within specs and speedometer is spot on.
Just an FYI, the stock tires are 275/285 and are 1.1% difference in height.

Your 285/305 is 2% difference.

295/305 is 1.1% difference, exactly like stock.
Correct but as u know bmw speedometer is off by 3 miles normally this set up fixes that issue and it's pretty spot on.
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      10-21-2020, 01:36 PM   #7
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Quote:
Originally Posted by GTATX View Post
Correct but as u know bmw speedometer is off by 3 miles normally this set up fixes that issue and it's pretty spot on.
I see what you're sayin.
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      10-22-2020, 10:39 AM   #8
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Quote:
Originally Posted by Higgs Boson View Post
I am running 295/35 and 305/35 on mine.
so those sizes fit perfectly on the standard 20 inch rims then?
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      10-22-2020, 01:09 PM   #9
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Quote:
Originally Posted by leeadam View Post
so those sizes fit perfectly on the standard 20 inch rims then?
OP didn't say stock wheels
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      10-22-2020, 01:52 PM   #10
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Quote:
Originally Posted by Higgs Boson View Post
OP didn't say stock wheels
ok , but he didn't say they weren't either, hence me asking as id like to go up a width on my oem 20 inch alloys
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      10-22-2020, 03:19 PM   #11
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Originally Posted by leeadam View Post
ok , but he didn't say they weren't either, hence me asking as id like to go up a width on my oem 20 inch alloys
Sorry, I thought you were being snarky, my bad.
I would only go up to the next size on the stock wheels
285 / 295
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      10-22-2020, 03:37 PM   #12
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Quote:
Originally Posted by Higgs Boson View Post
Sorry, I thought you were being snarky, my bad.
I would only go up to the next size on the stock wheels
285 / 295
yes i thought i might try that next time i renew, so should have no issues on car with that then
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      10-22-2020, 05:57 PM   #13
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What about rolling circumference for 285/295 and 295/305? I'm curious about upsizing as well, just don't want to damage the transfer case.
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      10-22-2020, 10:22 PM   #14
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Quote:
Originally Posted by Demon Barber View Post
What about rolling circumference for 285/295 and 295/305? I'm curious about upsizing as well, just don't want to damage the transfer case.
I have put 15k on the car with 285-35 and 305-35 no issues so far.
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      10-23-2020, 06:25 AM   #15
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Quote:
Originally Posted by GTATX View Post
I have put 15k on the car with 285-35 and 305-35 no issues so far.
ok cool so those 305 tyres go onto the standard rims no issues then, as a big jump in width.
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      10-23-2020, 08:08 AM   #16
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Quote:
Originally Posted by Demon Barber View Post
What about rolling circumference for 285/295 and 295/305? I'm curious about upsizing as well, just don't want to damage the transfer case.
Ya that's always been a big no no in the X forums due to issues with the transfer case and then dealer not warranting because of the tire issue. Hell even heard of a dealer trying not to warranty an issue because the owner swapped out the oem RFT
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      10-23-2020, 11:45 AM   #17
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Quote:
Originally Posted by leeadam View Post
Quote:
Originally Posted by GTATX View Post
I have put 15k on the car with 285-35 and 305-35 no issues so far.
ok cool so those 305 tyres go onto the standard rims no issues then, as a big jump in width.
Nope fit perfect
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      10-25-2020, 06:15 PM   #18
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Quote:
Originally Posted by Maverik259 View Post
Ya that's always been a big no no in the X forums due to issues with the transfer case and then dealer not warranting because of the tire issue. Hell even heard of a dealer trying not to warranty an issue because the owner swapped out the oem RFT
Remember that for winter you are allows to go with 265/35r20 and 285/35r20 which as a 20mm stagger on the same profile ends up being about the same 2% difference the whole way through other sizes
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      10-26-2020, 11:14 PM   #19
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Quote:
Originally Posted by brad850csi View Post
Quote:
Originally Posted by Maverik259 View Post
Ya that's always been a big no no in the X forums due to issues with the transfer case and then dealer not warranting because of the tire issue. Hell even heard of a dealer trying not to warranty an issue because the owner swapped out the oem RFT
Remember that for winter you are allows to go with 265/35r20 and 285/35r20 which as a 20mm stagger on the same profile ends up being about the same 2% difference the whole way through other sizes
The wintered I've seen typically used are either 19 or square 20. And I'm not saying you can't do that. Just saying the dealer are usually the king of shady thief's and will try and steal from you at any turn.
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      10-27-2020, 08:57 AM   #20
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Quote:
Originally Posted by brad850csi View Post
Remember that for winter you are allows to go with 265/35r20 and 285/35r20 which as a 20mm stagger on the same profile ends up being about the same 2% difference the whole way through other sizes
I was surprised when I saw this size recommendation in the official BMW winter tire brochure. It made me feel better about the 285 and 305 stagger I use for summer.
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