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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes 20' tire size question
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      01-06-2019, 07:09 AM   #1
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20' tire size question

I know there are a ton of threads on this topic but i can't seem to find an answer to my specific question.

I've been running 245/35 and 285/30 tires on 20x9 and 20x10 inch wheels on 2 different sets of wheels over the past 2 years. Despite driving carefully I've managed to bend almost all of them at various points due to crappy NYC roads.

I'm looking at getting another set of wheels with the specs below and am looking for suggestions for meatier tires for some more protection. I'm lowered on ACS springs

Front- 20x8.5 +30

Rear- 20x10 +38

any help is greatly appreciated!
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      01-06-2019, 11:04 AM   #2
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Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
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      01-06-2019, 06:40 PM   #3
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Quote:
Originally Posted by .BMW. View Post
Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
Quote:
Originally Posted by .BMW. View Post
Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
Thanks!
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      01-07-2019, 05:16 AM   #4
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Quote:
Originally Posted by J-RUE View Post
Quote:
Originally Posted by .BMW. View Post
Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
Quote:
Originally Posted by .BMW. View Post
Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
Thanks!
Any other suggestions? What about 255/35 and 295/30?
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      01-07-2019, 07:34 AM   #5
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Quote:
Originally Posted by J-RUE View Post
Any other suggestions? What about 255/35 and 295/30?
Those sizes will also fit, but you only get 1/8" extra sidewall.

The +5 profile tire sizes give you 1/2" extra sidewall.

Not sure how much difference in comfort you will feel with the two setups though.
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      01-08-2019, 06:50 PM   #6
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Quote:
Originally Posted by .BMW. View Post
Quote:
Originally Posted by J-RUE View Post
Any other suggestions? What about 255/35 and 295/30?
Those sizes will also fit, but you only get 1/8" extra sidewall.

The +5 profile tire sizes give you 1/2" extra sidewall.

Not sure how much difference in comfort you will feel with the two setups though.
Quote:
Originally Posted by .BMW. View Post
Quote:
Originally Posted by J-RUE View Post
Any other suggestions? What about 255/35 and 295/30?
Those sizes will also fit, but you only get 1/8" extra sidewall.

The +5 profile tire sizes give you 1/2" extra sidewall.

Not sure how much difference in comfort you will feel with the two setups though.
That makes sense, just worried 1/2 will run.
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      01-12-2019, 04:43 PM   #7
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Quote:
Originally Posted by .BMW. View Post
Just add +5 on the profile, i.e. 245/40-20 front and 285/35-20 rear.

Will fit just fine on those wheels!
What about a 20x9 +35 front wheel? 255/40?
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      01-12-2019, 05:35 PM   #8
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Quote:
Originally Posted by J-RUE View Post
What about a 20x9 +35 front wheel? 255/40?
No, that tire size will rub with those wheels!

255/40-20 is possible on F10 but the wheel offset is crucial.

This photo show 255/40-20 on 8.5x20" wheels with ET32, less than 1/10" clearance with the car on the lift and rubs with the weight on the wheels.



The front offset needs to be around 25-27, lower and the tire will rub the fender liner and higher the tire will rub the steering knuckle.
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      01-28-2019, 06:46 PM   #9
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Quote:
Originally Posted by .BMW. View Post
Quote:
Originally Posted by J-RUE View Post
What about a 20x9 +35 front wheel? 255/40?
No, that tire size will rub with those wheels!

255/40-20 is possible on F10 but the wheel offset is crucial.

This photo show 255/40-20 on 8.5x20" wheels with ET32, less than 1/10" clearance with the car on the lift and rubs with the weight on the wheels.

[IMG]http://f10.5post.com/forums/attachme...8;d=1442335725[/IMG]

The front offset needs to be around 25-27, lower and the tire will rub the fender liner and higher the tire will rub the steering knuckle.
Sorry haven't been on here in a while, thanks for the info. So will 245/40 work on 20x9 +35?
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      01-29-2019, 01:16 AM   #10
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Quote:
Originally Posted by J-RUE View Post
Sorry haven't been on here in a while, thanks for the info. So will 245/40 work on 20x9 +35?
Yes, 245/40 will fit!
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      01-29-2019, 04:30 AM   #11
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Quote:
Originally Posted by .BMW. View Post
Quote:
Originally Posted by J-RUE View Post
Sorry haven't been on here in a while, thanks for the info. So will 245/40 work on 20x9 +35?
Yes, 245/40 will fit!
thanks for all your help!
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      02-21-2019, 07:11 PM   #12
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I know this is late but the best would be
255/35/20 F
295/30/20 R
The diameters for both are same so you could throw this on an x-drive!
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