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Technical Topics Wheels and Tires Pirelli P7 Cinturato

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      12-05-2021, 11:18 PM   #1
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Pirelli P7 Cinturato

My car came with square 225 P7 All Season RFTs. My question is if anyone has used the 255s for rears? Tire rack says they should be OK but looks like they are not BMW approved.
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      12-05-2021, 11:24 PM   #2
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It really is a size too large for the stock wheel. Best to go with a staggered wheel setup if you want that sort of fit. Or, just stick with the square setup, which, realistically, isn't a bad thing at all.
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      12-06-2021, 12:09 AM   #3
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Quote:
Originally Posted by rostrata View Post
It really is a size too large for the stock wheel. Best to go with a staggered wheel setup if you want that sort of fit. Or, just stick with the square setup, which, realistically, isn't a bad thing at all.
No I have the staggered setup… I bought wider wheels and changed tires to Michelin AS 3+ soon after getting the car.
But now thinking about going back to RFTs but with 255s at the rear.
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      12-06-2021, 11:38 AM   #4
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Quote:
Originally Posted by RedKloud View Post
No I have the staggered setup… I bought wider wheels and changed tires to Michelin AS 3+ soon after getting the car.
But now thinking about going back to RFTs but with 255s at the rear.
Are you xDrive? You should be at least at a 1% threshold so you don't damage the transfer case. My car came with the same exact setup as yours with a 225 square on Pirelli P7 Cinturato. I too also swapped them out with Michelin Pilot Sport AS3+, the new sizes are 245 in the front and 275 in the rear on xDrive. Obviously I swapped out the stock wheels too.
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      12-06-2021, 12:16 PM   #5
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You can use a site like "willtheyfit.com" to compare your current set up to your proposed set up to see the percent difference in diameter
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      12-07-2021, 10:29 PM   #6
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Got staggered 225F/255R P7 AS RFTs installed today. Will report back on how they perform over the winter.
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      12-08-2021, 06:03 PM   #7
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For staggered set up, what rims are you getting?

Am I correct in assuming:

Front: 19/8
Rear: 19/8.5 ?
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      12-08-2021, 07:22 PM   #8
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Quote:
Originally Posted by RedKloud View Post
Got staggered 225F/255R P7 AS RFTs installed today. Will report back on how they perform over the winter.
I have that same staggered setup on my 2019 440i, they replaced OEM 19" Potenza. I have about 15K miles on them and I've had no issues. They're not as sticky as the Potenza but in Miami traffic, don't often have the chance to push it.
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      12-08-2021, 09:22 PM   #9
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Quote:
Originally Posted by TupperBMW View Post
For staggered set up, what rims are you getting?

Am I correct in assuming:

Front: 19/8
Rear: 19/8.5 ?
That is correct. I already had a staggered setup… just changed tires from non-RFTs to RFTs.
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      12-20-2021, 11:37 AM   #10
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Quote:
Originally Posted by jeegunkim View Post
Are you xDrive? You should be at least at a 1% threshold so you don't damage the transfer case.
^ Can anyone explain what this means? Thanks
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      12-20-2021, 01:26 PM   #11
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Quote:
Originally Posted by TupperBMW View Post
^ Can anyone explain what this means? Thanks
For xDrive vehicles, there's a requirement to keep the rolling diameter of all tires to be within a percent of each other. I think its something to do with how xDrive does power distribution and straying from the 1% lights your dash up and you get drivetrain malfunction errors. The transfer case is what splits power between the axles.
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