BMW wheel and tyre/tire geometry/sizes explained...

[genphreak]

The E30 has 56.1 mm CB and without any problems you can fit 7.5x16 ET30 with 225/45 R 16. Also E34 can run on 245/40 R 18 (on front ).
Jan

Thanks for your point Jan. I know e30 hub is smaller... but issed that, Doh!

Thanks. The thing is, just searching around it seems your suggestion of 56.1 might be 57.1mm. Not to nit-pick but I'd rather be right on this.

Also, this list is an attempt to detail known good fitments, a lot of the point here is to ensure a practical clearance, not just get the maximum size under there without rubbing in normal conditions... I am not going to add in sizes that reuire rolling the guards in most conditions.

For example, with 245s on the front e34 I have heard of rub in some cases so for now they have been left off the list.

It's a vague line to draw of course, but ultimately this list is designed to be a list of what you can whack on without doing body mods. It is not including staggered sizes either.

I feel people should choose themselves if they are going further than this as in some it can be a dangerous if it is not really properly modified/thought about. Nick

I'll update once the PCD is confirmed.

[Yaninnya]

Thanks for your point Jan. I know e30 hub is smaller... but issed that, Doh!

Thanks. The thing is, just searching around it seems your suggestion of 56.1 might be 57.1mm. Not to nit-pick but I'd rather be right on this.

You can be right. I didn't checked it just used my old hollow memory.

Also, this list is an attempt to detail known good fitments, a lot of the point here is to ensure a practical clearance, not just get the maximum size under there without rubbing in normal conditions... I am not going to add in sizes that reuire rolling the guards in most conditions.

E30 on 225/45 R 16 on 7.5x16 ET30 has a lot clereance. I run on them in my E30. You can go a lot wider on the rear (255 - 265 wide), on front some 245 are not too wide.

For example, with 245s on the front e34 I have heard of rub in some cases so for now they have been left off the list.

It is the matter of offset. That's why I quoted ET in E30 fitment.
Jan