[Zed519]

Quick question guys. If I decide to buy a g80 will my custom wheels from my f80 fit? I can’t seem to find a clear answer.

[VIERsr]

Originally Posted by Zed519

Quick question guys. If I decide to buy a g80 will my custom wheels from my f80 fit? I can’t seem to find a clear answer.

Of course not as they switched to 5x112 center bore in the G series instead of 5x120 of the F series.

[CanAutM3]

Originally Posted by Zed519

Quick question guys. If I decide to buy a g80 will my custom wheels from my f80 fit? I can’t seem to find a clear answer.

https://g80.bimmerpost.com/forums/sh....php?t=1762741

[lemetier]

Originally Posted by CanAutM3

You see, you are extrapolating. My interpretation of his answer is different.

From what I know of him, he is not specifically a "BMW insider", but an insider to the automotive world in general, which gives him insight to BMW .

This got weird haha

[solstice]

Originally Posted by lemetier

This got weird haha

Lol, it did didn’t it. I blame you

[Dave07997S]

I would probably switch out the 285/30/20 to a 295/30/20. More sidewall and a tad wider that would fit very well on the 10.5" wheel.

[chris719]

Originally Posted by Boss330

@CanAutM3 has already explained that point in a previous post on this thread.

There are quite a few misconceptions/misunderstandings in this thread. A few posters seem to confuse rim diameter and tyre diameter.

Porsche has a staggered setup on the 992 where both rim and tyre diameter is increased on the rear compared to the front. That obviously gives a larger contact area, not due to the increased rim diameter but due to the increased tyre diameter. Hence Porsche's reasoning of increased traction/grip on the rear with this setup.

BMW has, as CanAutM3 has pointed out multiple times, not done this. They have retained a tyre diameter of less than 1% difference between f/r, and only increased rear rim diameter. So no gain in tyre diameter or contact area from a 1" larger rear rim diameter in BMW's case.

Better turn in on the front axle and more stable rear due to a lower sidewall tyre. Best of both worlds!

I know this is a very old thread I'm bumping... but this is what was screaming out to me the whole time I read this thread. Thank you for highlighting this important point.

Porsche and GM on the Corvette do this 19/20 or 20/21 thing but their rear wheel + tire is a MUCH larger overall diameter. They use the 21" rear to bring the sidewall height down to visually match the front, so it doesn't look like the rear has an incredibly fat sidewall. Bonus is probably also tire availability. The 992 C2S has 245-35-20 on the front and 305-30-21 on the rear. You can see without even calculating that there is a large difference in overall diameter, but they have a visually similar sidewall when you look at pics of the car.

BMW has chosen to maintain a near-identical overall diameter. I understand why the front is 19". I don't necessarily understand why the rear is 20" other than looks and marketing comparison to MB and Audi. I see zero benefit for a lower profile rear tire with identical overall diameter. It would be slightly less compliant and I'm pretty sure that's not an improvement for the rear.

So, the people commenting that Porsche does it and giving Porsche reasoning are missing the essential fact that Porsche and GM increase overall diameter by a large amount. This rationale does not hold up for BMWs matched diameters.

[easm3]

Anyone try 20/20 setup with 826M's? I recall seeing a picture which looked great.

[mzcp]

763M on G80 with wheel adapters. Not mine

[FrozenGT]

Love how people in this thread seem to know more then the BMW engineers lol. Same as somehow some jankey aftermarket company knows more then BMW… LMFAO