Upgrade tires on stock Comp wheels advise needed

BMWFanatic2008 · 10-15-2019, 10:12 AM

Featured on BIMMERPOST.com

Hi guys,

Would the following tire setup work on stock X4M Competition wheels?

265 / 40 / R21 fronts
295 / 35 / R21 rears

Trying to stay within 1% difference in diameter vs stock.

For reference, here are the stock wheel and tire specs:

255 / 40 / R21; 21 x 9.5 fronts
265 / 40 / R21; 21 x 10 rears

I know 295 might be a little stretched for the 10" wheel but do you think it will be bearable in terms of both looks and performance?

Also, want to make sure that there will be no rubbing issues with increased width of the tires.

Thanks in advance.

onfireX5 · 10-15-2019, 10:19 AM

265 on the front will hit the inner bracket. Backs will hold more tire width.

BMWFanatic2008 · 10-15-2019, 11:08 AM

Quote:

Originally Posted by onfireX5

265 on the front will hit the inner bracket. Backs will hold more tire width.

That's unfortunate re: the fronts. Will 265s clear with spacers?

onfireX5 · 10-15-2019, 12:48 PM

Quote:

Originally Posted by BMWFanatic2008

That's unfortunate re: the fronts. Will 265s clear with spacers?

Very possible. 10-12mm might work. You would have to fit them and see. I was going to use 265's all around for winters....no go...

BMWFanatic2008 · 10-15-2019, 01:57 PM

Quote:

Originally Posted by onfireX5

Quote:

Originally Posted by BMWFanatic2008

That's unfortunate re: the fronts. Will 265s clear with spacers?

Very possible. 10-12mm might work. You would have to fit them and see. I was going to use 265's all around for winters....no go...

I see. I assume you tried fitting the back wheel in the front? This test would only be accurate if fronts and rears have the same offset. Do you know if that is the case?

2kaccordocoupe · 10-15-2019, 03:32 PM

Quote:

Originally Posted by BMWFanatic2008

I see. I assume you tried fitting the back wheel in the front? This test would only be accurate if fronts and rears have the same offset. Do you know if that is the case?

Front
21" Style 765M M Performance Oribit Gray, Machine-Polished Light Alloy Wheel - 9.5Jx21 ET:31
Part Number: 36-11-8-095-559
255/40/21

Rear
21" Style 765M M Performance Oribit Gray, Machine-Polished Light Alloy Wheel - 10Jx21 ET:39
Part Number: 36-11-8-095-560
265/40/21

BMWFanatic2008 · 10-15-2019, 03:47 PM

Quote:

Originally Posted by 2kaccordocoupe

Quote:

Originally Posted by BMWFanatic2008

I see. I assume you tried fitting the back wheel in the front? This test would only be accurate if fronts and rears have the same offset. Do you know if that is the case?

Front
21" Style 765M M Performance Oribit Gray, Machine-Polished Light Alloy Wheel - 9.5Jx21 ET:31
Part Number: 36-11-8-095-559
255/40/21

Rear
21" Style 765M M Performance Oribit Gray, Machine-Polished Light Alloy Wheel - 10Jx21 ET:39
Part Number: 36-11-8-095-560
265/40/21

Thank you. So 265 mounted on 10" wheel isn't identical fit to 265 mounted on 9.5" wheel.

onfireX5, can you please comment?

onfireX5 · 10-15-2019, 05:29 PM

Quote:

Originally Posted by BMWFanatic2008

Thank you. So 265 mounted on 10" wheel isn't identical fit to 265 mounted on 9.5" wheel.

onfireX5, can you please comment?

Did not try the rear wheel/tire combo. Ordered 265’s, took their section width over the 255 and measured the clearance. Sent the 265’s back.

BMWFanatic2008 · 10-15-2019, 09:54 PM

Quote:

Originally Posted by onfireX5

Quote:

Originally Posted by BMWFanatic2008

Thank you. So 265 mounted on 10" wheel isn't identical fit to 265 mounted on 9.5" wheel.

onfireX5, can you please comment?

Did not try the rear wheel/tire combo. Ordered 265’s, took their section width over the 255 and measured the clearance. Sent the 265’s back.

Ah I see, thanks for clarifying.

BMWFanatic2008 · 10-17-2019, 11:02 AM

Since 265s in the front are a no go, what would you guys recommend for the wider rear tires setup?

255/40/R21 fronts (stock size)
295/35/R21 rears

OR

255/40/R21 fronts (stock size)
285/35/R21 rears

49er · 10-17-2019, 11:32 AM

Why not just use 295 35 21 in rear. It’s circumference is 29.1” vs 29.3 on the 265 40 21. Almost identical.

BMWFanatic2008 · 10-17-2019, 11:49 AM

Quote:

Originally Posted by 49er

Why not just use 295 35 21 in rear. It's circumference is 29.1" vs 29.3 on the 265 40 21. Almost identical.

I was leaning towards 295s as well. My only concerns were: will it fit without any clearance issues and the fact that I am significantly widening the rears while keeping the fronts stock (don't want it to have any negative impact on the handling). 285s in the rear would be a modest / less aggressive change hence the reason I am considering this option.

m3cragg · 10-17-2019, 11:52 AM

305/35/21

49er · 10-17-2019, 11:56 AM

You also may want to contact Ind-Distribution. They are experts on BMW and they recently purchased a X3M comp. Spoke to them and I know they are working on fitment.

BMWFanatic2008 · 10-17-2019, 12:06 PM

Quote:

Originally Posted by 49er

You also may want to contact Ind-Distribution. They are experts on BMW and they recently purchased a X3M comp. Spoke to them and I know they are working on fitment.

Will do, thanks.

2kaccordocoupe · 10-17-2019, 02:53 PM

Quote:

Originally Posted by m3cragg

305/35/21

Now we're talking wide rear end!

clickclickboom · 10-21-2019, 06:05 PM

You say that 265's will hit the front bracket. Which bracket? I see that they could possibly rub the strut. I think small spacer front and rear would solve the problem. Am I wrong? I'm looking at a x3m now, but need to have all-seasons. I've done winter wheels/tires in the past and don't want to go that route. I have found that if you go up one size, 255/265 to 265/275 then all-seasons are available.

BMWFanatic2008 · 10-23-2019, 12:26 PM

Quote:

Originally Posted by clickclickboom

You say that 265's will hit the front bracket. Which bracket? I see that they could possibly rub the strut. I think small spacer front and rear would solve the problem. Am I wrong? I'm looking at a x3m now, but need to have all-seasons. I've done winter wheels/tires in the past and don't want to go that route. I have found that if you go up one size, 255/265 to 265/275 then all-seasons are available.

I agree with your assessment. I took a closer look and wider tire in the front (eg 265) will rub against strut assembly. 10-12mm spacer should correct this problem in theory. For the rears, you would only need a spacer for 295 and up.

Mtxzptlk · 10-23-2019, 05:43 PM

I'm all for going wider in the rear but are there going to be any adverse effects to the vehicle's handling?

There's got to be a reason why the X3MC came with 255 F/265 R spec.

DETSGTSTARSKY · 10-23-2019, 06:26 PM

Why do people try to out engineer the BMW engineers who put certain size tires on for a reason?

ParadigmDawg · 10-23-2019, 06:34 PM

Quote:

Originally Posted by m3cragg

305/35/21

Not on a 10" rim...

-JLT- · 10-23-2019, 06:37 PM

I went with 265/40/21(f) and 285/40/21(r) on stockers with 15mm spacers. I posted some pics on my build thread.

10-15-2019, 10:12 AM	#1
BMWFanatic2008 Major 233 Rep 1,177 Posts Drives: 2023 M3 6MT Join Date: Dec 2008 Location: Miami iTrader: (5)	Upgrade tires on stock Comp wheels advise needed Featured on BIMMERPOST.com Hi guys, Would the following tire setup work on stock X4M Competition wheels? 265 / 40 / R21 fronts 295 / 35 / R21 rears Trying to stay within 1% difference in diameter vs stock. For reference, here are the stock wheel and tire specs: 255 / 40 / R21; 21 x 9.5 fronts 265 / 40 / R21; 21 x 10 rears I know 295 might be a little stretched for the 10" wheel but do you think it will be bearable in terms of both looks and performance? Also, want to make sure that there will be no rubbing issues with increased width of the tires. Thanks in advance. __________________ Current: 2022 X3M Comp Previous: 2020 X4M Comp \| 1982 E24 633CSi \| 2016 F82 M4 \| 2015 F80 M3 \| 2014 F30 335xi \| 2013 F30 335xi \| 2010 E92 335xi
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10-15-2019, 10:19 AM	#2
onfireX5 Brigadier General 3618 Rep 4,532 Posts Drives: F90M5,F85X5M Join Date: Jul 2015 Location: Va iTrader: (0)	265 on the front will hit the inner bracket. Backs will hold more tire width.
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10-17-2019, 11:02 AM	#10
BMWFanatic2008 Major 233 Rep 1,177 Posts Drives: 2023 M3 6MT Join Date: Dec 2008 Location: Miami iTrader: (5)	Since 265s in the front are a no go, what would you guys recommend for the wider rear tires setup? 255/40/R21 fronts (stock size) 295/35/R21 rears OR 255/40/R21 fronts (stock size) 285/35/R21 rears __________________ Current: 2022 X3M Comp Previous: 2020 X4M Comp \| 1982 E24 633CSi \| 2016 F82 M4 \| 2015 F80 M3 \| 2014 F30 335xi \| 2013 F30 335xi \| 2010 E92 335xi
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10-17-2019, 11:32 AM	#11
49er Enlisted Member 27 Rep 43 Posts Drives: x5m Join Date: Dec 2017 Location: wine country iTrader: (0)	Why not just use 295 35 21 in rear. It’s circumference is 29.1” vs 29.3 on the 265 40 21. Almost identical.
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10-17-2019, 11:52 AM	#13
m3cragg Private First Class 17 Rep 150 Posts Drives: F87 X3M Join Date: Feb 2011 Location: Calgary iTrader: (0)	305/35/21 __________________ 2020 F97 X3M 2019 G05 X5 40i Msport 2015 F80 M3 2008 E92 M3
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10-17-2019, 11:56 AM	#14
49er Enlisted Member 27 Rep 43 Posts Drives: x5m Join Date: Dec 2017 Location: wine country iTrader: (0)	You also may want to contact Ind-Distribution. They are experts on BMW and they recently purchased a X3M comp. Spoke to them and I know they are working on fitment.
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10-21-2019, 06:05 PM	#17
clickclickboom Private First Class 78 Rep 164 Posts Drives: Rust Bucket Join Date: Oct 2008 Location: PA iTrader: (0)	You say that 265's will hit the front bracket. Which bracket? I see that they could possibly rub the strut. I think small spacer front and rear would solve the problem. Am I wrong? I'm looking at a x3m now, but need to have all-seasons. I've done winter wheels/tires in the past and don't want to go that route. I have found that if you go up one size, 255/265 to 265/275 then all-seasons are available.
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10-23-2019, 05:43 PM	#19
Mtxzptlk Driving Dog 871 Rep 1,221 Posts Drives: 635/1815, X3M Comp Join Date: Oct 2010 Location: That somewhere over the rainbow iTrader: (10)	I'm all for going wider in the rear but are there going to be any adverse effects to the vehicle's handling? There's got to be a reason why the X3MC came with 255 F/265 R spec.
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10-23-2019, 06:26 PM	#20
DETSGTSTARSKY Private First Class 69 Rep 127 Posts Drives: BMW Join Date: Nov 2014 Location: FL iTrader: (0)	Why do people try to out engineer the BMW engineers who put certain size tires on for a reason?
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10-23-2019, 06:37 PM	#22
-JLT- Brigadier General 3446 Rep 4,185 Posts Drives: '22 X4M COMP, '23 iX xDrive50 Join Date: Dec 2006 Location: CHITOWN iTrader: (1)	I went with 265/40/21(f) and 285/40/21(r) on stockers with 15mm spacers. I posted some pics on my build thread. __________________ -JLT-
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