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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-10-2016, 06:08 AM
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vili19 vili19 is offline
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Tire size question

Morning friends.

I picked up new rims and tires, but the tires I'm running with are:

Front 235/40/19
Rear 235/35/19

Do you think I should be running with this set up?

Manual states for 19's I should be using Front: 225/35/19 Rear: 255/30/19

The only reason I ask is because I heard that the xdrive system can screw up along with other issues by not running proper tires?

As always thanks guys.

Cheers
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  #2  
Old 05-10-2016, 08:33 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by vili19 View Post
...
I picked up new rims and tires, but the tires I'm running with are:

Front 235/40/19
Rear 235/35/19

Do you think I should be running with this set up?

Manual states for 19's I should be using Front: 225/35/19 Rear: 255/30/19

The only reason I ask is because I heard that the xdrive system can screw up along with other issues by not running proper tires?
No.

While staggered tire sizes are allowed, the circumference (diameter, radius) of the front and rear tires must be the same, especially on an xDrive car. Not being the same will cause the clutch in the transfer case to burn out - at the very least. It also causes problems with the ABS/DSC system.
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Old 05-10-2016, 09:50 AM
motoguy128 motoguy128 is offline
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Quote:
Originally Posted by vili19 View Post

Front 235/40/19
Rear 235/35/19
Is that a typo? If not, that's very strange, and must look a little weird with the widths the same but the sidewall be a little lower on the rear, than the front. Not only will the diameters be different causing XDrive issues, the rear will be lowered slightly compared to the front.

I'm trying to visualize what that does to handing.

255/35/19 on the rear might have been OK.
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  #4  
Old 05-11-2016, 10:18 AM
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vili19 vili19 is offline
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Quote:
Originally Posted by motoguy128 View Post
Is that a typo? If not, that's very strange, and must look a little weird with the widths the same but the sidewall be a little lower on the rear, than the front. Not only will the diameters be different causing XDrive issues, the rear will be lowered slightly compared to the front.

I'm trying to visualize what that does to handing.

255/35/19 on the rear might have been OK.

Thanks for your reply. I would hate to have to buy new fronts as I just bought these.

Do you think getting 255's at the back would be better?? Or am I going to have issues with 40's at front and 35's at back?
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Old 05-11-2016, 10:27 AM
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vili19 vili19 is offline
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Quote:
Originally Posted by motoguy128 View Post
Is that a typo? If not, that's very strange, and must look a little weird with the widths the same but the sidewall be a little lower on the rear, than the front. Not only will the diameters be different causing XDrive issues, the rear will be lowered slightly compared to the front.

I'm trying to visualize what that does to handing.

255/35/19 on the rear might have been OK.

Thanks for your reply. I would hate to have to buy new fronts as I just bought these.

Do you think getting 255's at the back would be better?? Or am I going to have issues with 40's at front and 35's at back?
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Old 05-11-2016, 10:29 AM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by vili19 View Post
...Do you think getting 255's at the back would be better?? Or am I going to have issues with 40's at front and 35's at back?
It's not the profile (40% versus 35%); it's the OVERALL DIAMETER that is the problem.
Go to tirerack.com (or the wheels/tires subforum) and use the tire size calculator (other places, too, are easy to find.)

You might want to go to tirerack.com, plug in your car and look for tires for the 19" rims. Look for the "Plus size" button or option.
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Old 05-11-2016, 12:12 PM
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vili19 vili19 is offline
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Quote:
Originally Posted by floydarogers View Post
It's not the profile (40% versus 35%); it's the OVERALL DIAMETER that is the problem.
Go to tirerack.com (or the wheels/tires subforum) and use the tire size calculator (other places, too, are easy to find.)

You might want to go to tirerack.com, plug in your car and look for tires for the 19" rims. Look for the "Plus size" button or option.



The manual specifies these sizes..


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  #8  
Old 05-11-2016, 03:21 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by vili19 View Post
The manual specifies these sizes..
Yes, but you've already stated that you're going to use 235/40R19 on the front: that size is not on that page. If you go oversize on the front, you need to go oversize on the rear. Not sure what that size would be, which is what tirerack's size calculator will tell you to use.

Although this list is for the E9x, it should give you the idea:
http://www.e90post.com/forums/showthread.php?t=1050762

Last edited by floydarogers; 05-11-2016 at 05:13 PM.
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  #9  
Old 05-11-2016, 07:00 PM
GeorgesAA GeorgesAA is offline
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I have an x-drive and I always try to keep a maximum difference in diameter size no greater than 1%.

Front tires : (235*0.4)*2/25.4+19=26.40
Rear Tires (235*0.35)*2/25.4+19=25.47

% Difference : 3.5

Not good.
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  #10  
Old 05-12-2016, 08:36 AM
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vili19 vili19 is offline
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Quote:
Originally Posted by GeorgesAA View Post
I have an x-drive and I always try to keep a maximum difference in diameter size no greater than 1%.

Front tires : (235*0.4)*2/25.4+19=26.40
Rear Tires (235*0.35)*2/25.4+19=25.47

% Difference : 3.5

Not good.

Hi GeorgesAA

I have swapped out the rears with 255/35/19

Based on your equation I am now at (255*0.35)*2/25.4+19= 26.02


I'm now .038% differance between the fronts and rears do you think this will be an issue?


Also just curious what does the 25.4 # in your equation represent?

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Old 05-12-2016, 08:45 AM
GeorgesAA GeorgesAA is offline
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That's much better. 25.4 is to convert mm to inches. Tire width is in metric but rim size is in imperial.
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  #12  
Old 05-12-2016, 08:48 AM
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vili19 vili19 is offline
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Quote:
Originally Posted by GeorgesAA View Post
That's much better. 25.4 is to convert mm to inches. Tire width is in metric but rim size is in imperial.
Thanks for your quick response this clarifies a lot.

Now I have some nearly new 235/35/19's to sell

Wish the tire shop did not screw up on this..
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Old 05-12-2016, 05:30 PM
cazzopazzo cazzopazzo is offline
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I have a dorman sensor for my car and is multi fit .. Would it program automatically..? Or Tire shop can ..?
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