Quote:
Originally Posted by DaveDee
Just got mine a few days ago and had done some research finding this for the offsets.... https://www.alloywheelsdirect.net/bm...93m_wheel_7830
These guys claim they are genuine wheels and have the BMW G42 M240i X-Drive series specs on their site and they make sense
But I spent a few hours at our local wheel manufacturer who is huge here in Australia (Koya Wheels) and I'm looking at some forged wheels
Tyre sizes 245/35/19 and 285/30/19. This keeps the diameter within the required 1% of the X-Drive spec and works out to .4% (same as the stock 225/40s and 255/35s
I'll get all the figures soon but one of the factors was brake clearances not so much on the width of the callipers but they are very tall and come close to the barrels. The fully forged wheel is a good way around this to give adequate diameter on the inner barrel
These will be a very tight fitment and when done I'll post the specs and pics
All the other usual stuff getting done this week |
I'm confused on this 1% math. You're saying the diameter difference between 245/35 and 285/30 is .4%, but it's actually 0.99 which is approximately 1:1. Virtually no difference, but you end up with a front tire slightly taller than your rear tire. Or did you mean 245/35 and 285/35?
If you meant the latter, then the diameter difference is 4%, not .4%.
Regarding the OEM 225/35 and 255/35, the diameter difference is 3.2%. Does this 1% variance mean any change needs to not exceed 3.2% by 1 percentage point, so anywhere between 2.2% to 4.2% between front and rear is acceptable?
If the above is true, then a 245/35 front and a 285/35 rear is about as large of a delta as you can go w/o exceeding 1 percentage point of 3.2%.
Someone please check my math and correct me if I'm not getting this.