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      01-11-2016, 01:05 PM   #1
DrMattN40
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Bigger Tires?

I am wondering if I could run 275/45/21 on the front and 315/40/21 on the rear of my M (215 style wheels). Stock runs 285/35/21 and 325/30/21. I'm looking for a thicker sidewall. Any experts out there please let me know what you think the potential issues would be. Thanks
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      01-11-2016, 03:23 PM   #2
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It is not possible, buy 20's if you want this.
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      01-11-2016, 04:17 PM   #3
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Quote:
Originally Posted by X Driver View Post
It is not possible, buy 20's if you want this.
What makes it not possible?

The aspect ratios are off by the same 2.25mm front and rear as the stock. Overall diameter with wheels and tires for front stock is 28.85" and with the set-up I mentioned the front diameter would be 30.74" (less than 2 inch addition) with nearly identical less than 2" change in the rear. I thought this would be similar to lowering 2 inches. There is definitely enough room in the wells, I'm just worried about the steering mechanism up front or anything else I am not calculating for.

Thank you for the assistance.
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      01-12-2016, 08:47 AM   #4
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They are to big and touch the wheel arc when steering. One more thing, the speedo is not correct anymore.
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      01-12-2016, 02:09 PM   #5
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Quote:
Originally Posted by DrMattN40 View Post
front stock is 28.85" and with the set-up I mentioned the front diameter would be 30.74" (less than 2 inch addition)
Adding 2 inches to overall diameter will very likely cause them rubbing against the upper balljoint.



See this thread. A guy installed oversize offroad tires.
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      01-12-2016, 04:36 PM   #6
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Quote:
Originally Posted by serge1 View Post
Adding 2 inches to overall diameter will very likely cause them rubbing against the upper balljoint.



See this thread. A guy installed oversize offroad tires.
Forgive my ignorance on some of this stuff... isn't adding tire diameters of 2 inches more than stock the same as lowering the vehicle 2 inches with springs on the current size?
The tires I am looking at are regular all-season tires, not aggressive knobby off-road ones. (also, I have 12.5mm spacers up front, 20mm in rear). Thanks for the help.
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      01-12-2016, 08:51 PM   #7
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Quote:
Originally Posted by DrMattN40 View Post
Forgive my ignorance on some of this stuff... isn't adding tire diameters of 2 inches more than stock the same as lowering the vehicle 2 inches with springs on the current size?
The tires I am looking at are regular all-season tires, not aggressive knobby off-road ones. (also, I have 12.5mm spacers up front, 20mm in rear). Thanks for the help.
Kind of, in your example a 2" increase in tire size would be like a 1" drop. I.e. The top of the tire is one inch closer to the top of the wheel well.

The difference though are items that move in direct relation to the wheel hub like ball joints. When lowering a car, there is no change in the distance from that joint to the tire. The entire assembly move further along its upward travel. When installing larger tires, the distance from those components attached to the hub is now reduced. This will cause the tires to rub on certain components. This is regardless of any amount of lifting or raising of the suspension.

Think along the lines of trying to run a wheel too small to clear a caliper
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      01-12-2016, 08:52 PM   #8
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Lowering has nothing to do with it.
You did say the overall diameter will increase from 28.85 to 30.74.
That may cause the tire to rub the upper ball joint, because the tire sort of goes under the ball joint. This has nothing to do with lowering.

Take a look at the diagram (#2, #3):

http://www.realoem.com/bmw/enUS/show...diagId=31_0786
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      01-12-2016, 09:25 PM   #9
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Quote:
Originally Posted by Crazy1323 View Post
Kind of, in your example a 2" increase in tire size would be like a 1" drop. I.e. The top of the tire is one inch closer to the top of the wheel well.

The difference though are items that move in direct relation to the wheel hub like ball joints. When lowering a car, there is no change in the distance from that joint to the tire. The entire assembly move further along its upward travel. When installing larger tires, the distance from those components attached to the hub is now reduced. This will cause the tires to rub on certain components. This is regardless of any amount of lifting or raising of the suspension.

Think along the lines of trying to run a wheel too small to clear a caliper
Thanks for the clarification. From looking at 275/45/21, with 12.5mm spacers, do you think I can do it, or would I need spacers so wide that it looks ridiculous?

Or do I just lower it 1.2 with H&R?

Thanks again.
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      01-12-2016, 09:26 PM   #10
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Quote:
Originally Posted by serge1 View Post
Lowering has nothing to do with it.
You did say the overall diameter will increase from 28.85 to 30.74.
That may cause the tire to rub the upper ball joint, because the tire sort of goes under the ball joint. This has nothing to do with lowering.

Take a look at the diagram (#2, #3):

http://www.realoem.com/bmw/enUS/show...diagId=31_0786
Thanks for the assistance.
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      01-13-2016, 07:35 AM   #11
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spacers would extend the wheels out for sure. It's possible with enough distance from the upper CA, however then you risk rubbing the pinch weld area (corners of the wheel well)
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      01-13-2016, 09:25 AM   #12
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I had those Nitto Terra Grapplers on my Range Rover and I loved them. Would definitely buy them again. Unfortunately they come in 265/50/20 so if anyone successfully installs them on an X5M with no rubbing I'll order some straight away!
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