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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes Tires Size with 20's
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      03-22-2012, 09:11 PM   #1
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Question Tires Size with 20's

About to order my tires, wanted to see what people were running.

I have a set of 20x9 front, 20x10 rear CF10's and was planning on running 245/35 on the front and 285/30 on rear.

Is that the right set up?
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      03-22-2012, 10:20 PM   #2
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That's what I'm running
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      03-22-2012, 10:42 PM   #3
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That's what I'm running as well. And Michelin PSS 245/35R20 just arrived in Hong Kong. I put on the first pair of those on my F10 front
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      03-23-2012, 12:18 AM   #4
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I am running front 245/35/20 and rear 275/30/20 with Advan db tires!

Front 9" x 20" and Rear 10" x 20"

Last edited by rickf10; 03-23-2012 at 12:23 AM..
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      03-23-2012, 02:33 AM   #5
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I'm running Michelin Pilot SS's, 255 fronts and 285 rears on a M-tech 550 F10. And considering 295 rear and 275 fronts on my next set. 20x9 fronts and 20x10 rears.
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      03-23-2012, 04:52 AM   #6
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Quote:
Originally Posted by SriRamJaiRam View Post
I'm running Michelin Pilot SS's, 255 fronts and 285 rears on a M-tech 550 F10. And considering 295 rear and 275 fronts on my next set. 20x9 fronts and 20x10 rears.
275 fronts may rub, especially if your car is lowered......

PSS255 rubs with MS8 20X9 on my 550i with ACS springs.
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      03-23-2012, 07:09 AM   #7
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Is 255 or 245 a better match for 285's in the back?
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      03-23-2012, 12:30 PM   #8
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245+285 is close in diameter than 255+285.
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      03-23-2012, 04:43 PM   #9
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I'm running 245 fronts on 20x9 and 285 rears on 20x10.5.
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      03-28-2012, 02:06 AM   #10
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Quote:
Originally Posted by mlai
Quote:
Originally Posted by SriRamJaiRam View Post
I'm running Michelin Pilot SS's, 255 fronts and 285 rears on a M-tech 550 F10. And considering 295 rear and 275 fronts on my next set. 20x9 fronts and 20x10 rears.
275 fronts may rub, especially if your car is lowered......

PSS255 rubs with MS8 20X9 on my 550i with ACS springs.
I'm running 255 on the fronts with a 20x9 35 offset wheel & a 10mm spacer. Also have KW variant 2 coil overs. Car looks bad ass and no rubbing up front. But it's close
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      03-28-2012, 02:21 AM   #11
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Quote:
Originally Posted by remmib View Post
245+285 is close in diameter than 255+285.
Perhaps I am wrong with my understanding of tire sizes, but the diameter depends on the hight of the tire, not the width alone. The figures 255/285 are the width, not the hight. Only with the additional figures of hight, you get the picture. Also the width of the rim is relevant, because the tire stretches on the rim. Sorry for stating the obvious, but I just want to make sure I am not wrong with my thinking. Please correct me if I am...

We have on the F11 the BBS CH-R 255/35 20x9-rim (front) and 285/30 20x10.5-rim (rear) which is ok with the M-suspension. Tires are PSS. No rubbing in any way...
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      03-28-2012, 04:13 AM   #12
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Quote:
Originally Posted by itf joegun View Post
Perhaps I am wrong with my understanding of tire sizes, but the diameter depends on the hight of the tire, not the width alone. The figures 255/285 are the width, not the hight. Only with the additional figures of hight, you get the picture. Also the width of the rim is relevant, because the tire stretches on the rim. Sorry for stating the obvious, but I just want to make sure I am not wrong with my thinking. Please correct me if I am...

We have on the F11 the BBS CH-R 255/35 20x9-rim (front) and 285/30 20x10.5-rim (rear) which is ok with the M-suspension. Tires are PSS. No rubbing in any way...
The height(of tire wall) is a function of the width.

245/35/20 and 285/30/20 will be the closet match as they give a overall wheel diameter of 679.5mm and 679mm respectively.
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      03-28-2012, 05:13 AM   #13
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Quote:
Originally Posted by helbreath View Post
The height(of tire wall) is a function of the width.

245/35/20 and 285/30/20 will be the closet match as they give a overall wheel diameter of 679.5mm and 679mm respectively.
Sorry, for that become is a usefull information, I think it is necessary to state the width of the rim you are referencing to.

So it must be: "The height (of tire wall) is a function of the width of the rim, the width of the tire and also the hight of the tire." Correct?

Sorry again, but I want to understand this.
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      03-28-2012, 08:24 AM   #14
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Wouldn't 255 front and 275 back also be a good combination for the F10?

the overall diameter is almost the same and closer than 255/285 combo.

For me i rather have a meatier tire up front for potholes.

Alan
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      03-28-2012, 09:05 AM   #15
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I am running Michelin PSS 255 front and 285 in rear. On 20x9 and 20x10.5. I am considering going a little wider in rear on next set because I have a little stretch going??
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      03-28-2012, 10:54 AM   #16
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Quote:
Originally Posted by itf joegun
Quote:
Originally Posted by remmib View Post
245+285 is close in diameter than 255+285.
Perhaps I am wrong with my understanding of tire sizes, but the diameter depends on the hight of the tire, not the width alone. The figures 255/285 are the width, not the hight. Only with the additional figures of hight, you get the picture. Also the width of the rim is relevant, because the tire stretches on the rim. Sorry for stating the obvious, but I just want to make sure I am not wrong with my thinking. Please correct me if I am...

We have on the F11 the BBS CH-R 255/35 20x9-rim (front) and 285/30 20x10.5-rim (rear) which is ok with the M-suspension. Tires are PSS. No rubbing in any way...
The hight depends on width. 275/30 means that the hight is 30% of the tyre's width (275). However here in Europe tyres' sizes are not free. You need follow the size options reported in the car's certificate of conformity.
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      03-28-2012, 11:22 AM   #17
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Quote:
Originally Posted by Amleto63 View Post
The hight depends on width. 275/30 means that the hight is 30% of the tyre's width (275). However here in Europe tyres' sizes are not free. You need follow the size options reported in the car's certificate of conformity.
Cheers
Ok, thank you for clarification. I am not aware that the hight is a relative value...
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      03-28-2012, 12:10 PM   #18
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Quote:
Originally Posted by itf joegun View Post
Perhaps I am wrong with my understanding of tire sizes, but the diameter depends on the hight of the tire, not the width alone. The figures 255/285 are the width, not the hight. Only with the additional figures of hight, you get the picture. Also the width of the rim is relevant, because the tire stretches on the rim. Sorry for stating the obvious, but I just want to make sure I am not wrong with my thinking. Please correct me if I am...

We have on the F11 the BBS CH-R 255/35 20x9-rim (front) and 285/30 20x10.5-rim (rear) which is ok with the M-suspension. Tires are PSS. No rubbing in any way...
Yes, I meant 245/35/20 and 285/30/20.
35 means 35% of 245 = 85,75mm
30 means 30% of 285 = 85,50mm
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      03-31-2012, 05:29 AM   #19
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Quote:
Originally Posted by rickf10 View Post
I am running front 245/35/20 and rear 275/30/20 with Advan db tires!

Front 9" x 20" and Rear 10" x 20"
Hi buddy, how's your advan db work ? Any comment about it ? Cos I order it but my car haven't arrive. thank you !

P.S. my rims and tyres spec is same as yours
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      01-27-2016, 12:33 AM   #20
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I need help BMW 535xi & I have just bought rims bmw m5 2015 20 I want to know exact rubber zise I need if they can help me thanks
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      01-27-2016, 03:02 AM   #21
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Just purchased some new 20" 9.5 and 10.5 JUDD wheels for my F11 535D, fitted 245/35/20 and rear 275/30/20 as per the recommendation from JUDD Wheels
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      01-29-2016, 07:47 PM   #22
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245/35 and 285/30 is what's recommended for stock F10.


Sales @ UPWheels.com * Ph. 657.888.4UPW * FacebookDOTcom/UPWheels
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