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      10-11-2019, 12:32 AM   #1
badmon1992
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How wide can I go

Ok so just wondering if anyone has any idea how wide I can go on the following below
440i xdrive
Bmw oem rim style 624
Front 20x8 offset:36
Rear 20x8.5 offset: 47


Currently have the following tires(which are recommended) on:
225/35-20 fronts
255/30-20 rear

I read somewhere the max you can go is
Front: 245/35/20
Rear: 275/35/20
It seems okay but the height ratio is the same versus the recommended size they are different. Any ideas out there?
Also my car is not lowered and is stock.
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      10-11-2019, 01:35 AM   #2
alohasurftoad
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Max on 8.5" is 255/30/20

Max on 8" is 245/30/20
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      10-11-2019, 08:40 AM   #3
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Quote:
Originally Posted by badmon1992 View Post
Ok so just wondering if anyone has any idea how wide I can go on the following below
440i xdrive
Bmw oem rim style 624
Front 20x8 offset:36
Rear 20x8.5 offset: 47


Currently have the following tires(which are recommended) on:
225/35-20 fronts
255/30-20 rear

I read somewhere the max you can go is
Front: 245/35/20
Rear: 275/35/20
It seems okay but the height ratio is the same versus the recommended size they are different. Any ideas out there?
Also my car is not lowered and is stock.
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      10-14-2019, 07:53 PM   #4
Expert@ApexRaceParts
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With xDrive, it's imperative to keep the front and rear rolling diameters no more than 1% different from each other. Potential fitment/rubbing issues aside, 245/35-20 and 275/35-20 are 3.1% different from each other, and are therefore not compatible with xDrive.

The closest sizes in this realm that would be compatible are:
Front: 235/35-20
Rear: 275/30-20

These sizes are 0.1% different, which is acceptable for xDrive. For reference, the OEM sizes of 225/35-20 and 255/30-20 are 0.7% different.

I'd recommend the 235/275 combo listed above if you're looking to add wider tires while staying with xDrive compatible sizes.

--Dylan
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      10-15-2019, 11:02 PM   #5
badmon1992
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Quote:
Originally Posted by Expert@ApexRaceParts View Post
With xDrive, it's imperative to keep the front and rear rolling diameters no more than 1% different from each other. Potential fitment/rubbing issues aside, 245/35-20 and 275/35-20 are 3.1% different from each other, and are therefore not compatible with xDrive.

The closest sizes in this realm that would be compatible are:
Front: 235/35-20
Rear: 275/30-20

These sizes are 0.1% different, which is acceptable for xDrive. For reference, the OEM sizes of 225/35-20 and 255/30-20 are 0.7% different.

I'd recommend the 235/275 combo listed above if you're looking to add wider tires while staying with xDrive compatible sizes.

--Dylan

That makes alot of sense. But do you think the 275 will fit properly on an 8.5 rear rim?
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      10-16-2019, 12:48 PM   #6
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Quote:
Originally Posted by badmon1992 View Post
That makes alot of sense. But do you think the 275 will fit properly on an 8.5 rear rim?
It'll fit on the wheel, but it's not something we'd recommend. It may also cause rubbing depending on ride height. The recommended wheel width for a 275 tire is 9.5" or 10".

xDrive can be somewhat limiting in terms of changing tire sizes. Ultimately you'll want to use wider wheels to support wider tires in order to maintain proper tire sidewall support.

Alternatively, you can run a square fitment such as a 9" wide wheel with an offset of ≈ET30 and fit 255 tires all around for more neutral and balanced handling characteristics.

--Dylan
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