03-18-2024, 05:25 PM | #1 |
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xDrive & Tire Size
I know there are threads on this but there seems to be a debate about what is proper tire size. I'm about to order a set of tires for my new wheels and am wondering what all you xDrive G8X's are running, I've ready some are 285/30 and 295/30 but it breaks the 1% threshold by 0.1%, there are others saying it should be 275/30 and 285/30 as it would be below the 1% threshold. I'm hoping the 285/295 setup will be fine to run. Any thoughts?
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03-19-2024, 09:00 AM | #3 |
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Is it circumference or diameter that needs to be within 1%? I would have thought circumference as this causes the rotational distance difference though they are related of course. And is % calculated from smaller as increase?
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03-19-2024, 09:02 AM | #4 |
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Height.
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03-19-2024, 11:42 AM | #5 |
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Thanks for the input, man. Funny enough, I'm installing the same wheels, ha! How long have you been running this tire setup?
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03-19-2024, 12:25 PM | #6 |
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03-19-2024, 01:05 PM | #7 |
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Gotcha, I'm already lowered and liners are trimmed so I should be good to go. Hopefully some other folks whos on xDrive with the same times can also chime in just to make sure. Last thing I want is transfer case issues because of the wrong tire sizes.
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03-19-2024, 01:22 PM | #8 | |
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Quote:
F: Michelin PS4S Star BMW 285/30/20 R: Michelin PS4S N0 Porsche 295/30/20 I got this info from the TE37 thread, I think I saw a couple other xDrive owners on there running the same setup. Additionally, you can reference Apex fitment guides, they’ll tell you which setups are xDrive compatible: https://apexwheels.com/fitment-guide...-fitment-guide |
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03-20-2024, 11:15 AM | #9 | |
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Quote:
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03-20-2024, 12:48 PM | #10 |
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Have thousands of miles on my xdrive G80 with 285/30/20 front and 295/30/20 rear and 100% fine, you will be good
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03-20-2024, 01:57 PM | #11 |
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Circumference is pi times diameter. If one is within 1%, so is the other one
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03-20-2024, 03:47 PM | #12 | |
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![]() I ran into this problem on our g20 x-drive when buying winter tires. In my case, it was the front tire that was larger in diameter (front +0.8% wrt rear dia). Switched to a setup with the rear tire having a larger diameter (front -0.8% wrt rear dia) and it’s worked perfectly for the past 4 years. I tried a few additional tire diameters and found for the g20 330ix with THP that front tires with diameters +0.5% to -1.00% wrt the rear diameter works perfectly. For some reason, the g20 330ix is slightly biased more towards a front tire that is smaller in diameter than the rear tire. I initially thought it was going to be +1.0% to -1.0% wrt rear tire. What is it for the g8x x-drive? |
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03-20-2024, 07:25 PM | #13 |
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I'll have 285/35/19 295/30/20 Supercar3 on at the end of the month. I'll update when I get them mounted on Apex wheels. already cleaned up the fins in the front fender liner. G80 xDrive
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03-22-2024, 01:25 AM | #14 |
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Car comes 0,4% off from factory. So I think you’re good if you are +/- 1% from the 0,4%.
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03-27-2024, 10:13 PM | #15 |
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https://tiresize.com/calculator/
Thought I'd share the link to this calculator on this thread. You can enter the specs for your front and rear setup. IIRC, official xDrive recommendations are 1.1% or less variance between the front and rear. As tires are circles, your diameter and circumference will be the same ratio when comparing front to rears. I've got 275/30/20 in the front and 285/30/20 in the rear, at a 0.8% rotational difference, which appears to be just fine; for example. |
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03-28-2024, 02:13 PM | #16 |
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03-28-2024, 07:09 PM | #17 |
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Thanks man! Just 5mm up front, didn't need to, just wanted the front to be a little more aggressive
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