02-10-2021, 07:33 AM | #45 |
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How to calculate the difference in % , and is the wheel size important or only the tyre size?
for example , i have a xdrive m240i , with default 7,5x18 and 8,x18 and 225/40 front and 245/35 rear. if i buy new wheels 8x18 and 9x18 with the same tyre size (225/40 front and 245/35 rear) , is that good ? thanks Last edited by kriszty; 02-10-2021 at 08:27 AM.. |
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02-10-2021, 10:51 AM | #46 | |
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if you want to compare wheel diameter, width, offsets and tyres, go here... https://www.willtheyfit.com/ 225/40/18 & 245/35/18 is 1.2% difference from BMW if your new wheels are 18x8 & 18x9, you can use your original tyres but i would use 225/40/18 & 255/35/18 OR 235/40/18 & 265/35/18 if their offsets permit. |
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02-10-2021, 12:04 PM | #47 | |
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02-12-2021, 09:24 PM | #48 |
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I'm new to the xdrive scene and wanted to do a staggered set up. I've read through the thread and used the calculators you guys posted and my numbers come up as -0.4. I'm assuming that is acceptable correct?
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02-12-2021, 11:14 PM | #49 | |
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since you're using taller than OEM tires, your front offset should be between +30-35 and rear between +40-45. this should mitigate any interference problems while turning full lock up front and during large compression for the rear. |
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05-05-2021, 04:49 PM | #50 |
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Bit of an old thread, but to add one more experience to the stack...
I started to quote multiple posts, but there are many of them, so I won't. But this is regarding which tires wear out faster, front vs. rear. My xDrive has a square setup with Pirelli Cinturato P7s. On every car I've ever owned, the fronts wear out faster than the rears due to reasons explained earlier on this thread, scrubbing in turns. Even on strictly RWD vehicles, this has been the case. For me, however, this car DOES wear out the rear tires faster than the front. I have no idea why, I don't get on my car hard from a stop or really even push it hard but once in a while. But, it does. Defies logic.
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05-06-2021, 07:34 AM | #52 |
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45 years of driving RWD cars that always wore out the front tires faster tells me otherwise. One might think that if the rears are providing all of the force when accelerating that they'd wear faster, but that's cancelled out by the fronts providing most of the stopping power. Where this doesn't apply is if you're doing silly stuff. like burnouts and drifting.
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06-05-2021, 05:38 AM | #54 |
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My boss, who also drives a BMW, just told me about this issue. His friend allegedly wrecked his xDrive because of different wear of his different sized wheels.
My BMW is from 12/2015. The winter wheels are all the same size, but the summer wheels are 225/40 R19 and 255/35 R19. Now, since all wheels are originally from BMW, I always thought, nothing can go wrong. Do I have to fear a big gear box damage in the future (with big bill), after what my boss said? |
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06-05-2021, 08:06 AM | #55 | |
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06-05-2021, 10:49 AM | #56 | ||
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06-18-2021, 08:10 AM | #58 | |
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I'm running the same size on my F36
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07-28-2021, 06:45 PM | #60 | |
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07-29-2021, 06:56 AM | #61 |
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08-16-2021, 04:34 PM | #62 | |
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09-20-2021, 03:45 PM | #64 | |
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If your rear tires wear faster than the front you have a problem. The rear tires will not spin independently from the front enough to wear tires unless the transfer case is out. I run 245/40-19 front and 285/35-19 rear. That is .2 tenths of a inch different. I was running 275/35-19 rear, which is about .15 smaller than the 285, so basically +-.15 in either direction. I have had absolutely no problems Ed |
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09-20-2021, 10:18 PM | #65 | ||
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Then my '14 435, '15 335, '18 340i, and my current M340i which were/are all xdrives have the rears wear faster. My service advisor confirms that is normal.
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01-13-2022, 06:25 AM | #66 |
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Hi there , im new here , i have a f34 330d xdrive and i would like to upgrade the wheels from 19x8 front and 19x8,5 back with 20x8,5 front and 20x9 back , any advice on what tires i sould get to not mess up the xdrive system?
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