View Single Post
      11-13-2018, 08:13 AM   #60
F30_320D_UK
Private First Class
F30_320D_UK's Avatar
United Kingdom
202
Rep
187
Posts

Drives: BMW F30 320D M-Sport
Join Date: Nov 2018
Location: Manchester, UK

iTrader: (0)

Quote:
Originally Posted by jseeey View Post
It doesn't seem like your setup is "square"; I had the same 403M wheels and tires sizes on my 328d xdrive which results in a 0.4% difference in diameter. BMW North America claimed this is enough to damage the transfer case and wouldn't warranty my failure (or even diagnose the car with that setup) which makes no sense since that comes as a stock setup in the UK.

FWIW I put 225/40R19 all around on mine for now so the tires are "square" and I've been looking for another set of 403M's to make a true square setup of wheels and tires...
Just had another look as the 0.4% sounded so small.
According to this calculator the rolling diameter of the front wheels are 663mm and the rears are 661mm (with the factory 403M configuration)

That's a difference in 2mm which equates to 0.3%
It's really pathetic to think that BMW designs a transfer box and sells a car with this wheel configuration and saying the transfer box can't cope with this difference in rolling diameter

(http://www.rimsntires.com/specspro.j...r%20H2%20wheel)

Also, are you running 225/40/R19 all round?
Does this mean you're running in effect a 'stretched' rear tire, as the 403M rear rims are 8.5J?

Last edited by F30_320D_UK; 11-13-2018 at 08:40 AM..
Appreciate 0