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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes 20" tire size options on the 535i x Drive M Sport
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      04-20-2019, 10:16 PM   #1
Gypsyking
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20" tire size options on the 535i x Drive M Sport

Gentlemen,

First of all I want to thank you for all the knowledge that I have gained in last couple of months going over various threads concerning the F10 (5 Series). In a week or so I will be picking up a 2015 535i x Drive M sport that has 33,000 miles on the clock. This will be my first BMW.

The car comes with M434 wheels (8.5Jx20 Front & 9JX20 Rear). Currently it has 245/35R20 (F) & 275/30R20(R) Bridgestone Potenza RE050A tires. The tread depth in front is 8mm (10/32) & 5mm (6/32) on the rear tires.

Im a light footed driver & would like to know how much life these tires have left in them? Im considering Michelin Pilot Sport 4S as replacement in the near future. For the rear tires I would like to opt for 285/30R20 instead of the stock size. Would these tires fit without any problem such as rubbing? Additionally on account of the larger circumference, how much speedometer error am I likely to see? Besides how will a non-stock tire size (Rear) affect the AWD drive system if at all? There is also the option of Michelin Pilot Sport A/S 3+ which is an All Season Ultra High Performance Tire. How is your experience with these tires?

Thank you very much for your time & help in advance.
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      04-21-2019, 02:21 AM   #2
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285/30-20 is no problem to fit without rubbing on F10.

But your issue would be the rear 9x20" wheels. 275 is the widest tire you can fit on those.
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      04-21-2019, 09:03 AM   #3
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With xDrive it's important to keeping the diameter of the front and rear tires the same to avoid problem with the transfer box.
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      04-21-2019, 05:15 PM   #4
Gypsyking
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Quote:
Originally Posted by remmib View Post
With xDrive it's important to keeping the diameter of the front and rear tires the same to avoid problem with the transfer box.
That's interesting indeed.

I assume the car came from the factory with this staggered tire set up.

As per Tire Rack the rolling diameter of the front tires (245/35R20) is 26.8" while that of the rear tires (275/30R20) is 26.5". The difference in rolling diameter is 1.13 percent. I guess BMW is okay with that & by corollary difference of 1 percent in rolling diameter does not put adverse effect on the AWD system.
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      04-21-2019, 07:05 PM   #5
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Quote:
Originally Posted by Gypsyking View Post
Quote:
Originally Posted by remmib View Post
With xDrive it's important to keeping the diameter of the front and rear tires the same to avoid problem with the transfer box.
That's interesting indeed.

I assume the car came from the factory with this staggered tire set up.

As per Tire Rack the rolling diameter of the front tires (245/35R20) is 26.8" while that of the rear tires (275/30R20) is 26.5". The difference in rolling diameter is 1.13 percent. I guess BMW is okay with that & by corollary difference of 1 percent in rolling diameter does not put adverse effect on the AWD system.
All BMWs comes with star marked tires from the factory. These are what you can call OEM tires, and they're made for and approved by BMW.

And as I understand it, the staggered tire setups on xDrive models are made so they have the same circumstances, even if they in theory should have an one point something percent difference.
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      04-23-2019, 11:19 PM   #6
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Okay, new problem. The pictures that were sent to me (the car is 700 miles away) had two cuts on the sidewall on one of front tires. As far as I know sidewall cuts cannot be repaired. Should I be asking for the two front tires to be replaced?

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      04-24-2019, 12:14 PM   #7
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That tire needs to be replaced. Because it is xDrive, it might also make sense to have both front tires replaced, assuming the old ones are fairly worn.

I'm running 245/40/19 and 275/35/19 tires on my stock xDrive with no problems. For a 20" wheel, 245/35/20 and 285/30/20 are actually a better fit vis-a-vis diameter and circumference. Check out this link. Nevertheless, because your rear wheel is only 9" wide, and as has been said before, you probably cannot go with a 285mm wide tire, so stick with 275mm per your original setup.

Depending on where you are with negotiation and if you do plan on replacing these tires with Michelin P4S or similar, then I'd probably ask for a bit more off of the price of the car vice asking them to replace the tires, and then replace all four with the Michelin non runflat tires. The ride improvement and handling on Michelin tires (I have Pilot Super Sport vice the newer P4S) is very noticeable.
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