Quote:
Originally Posted by JNoSol
Hello friends. Just a background, I'm a nerd when it comes to wheels and tires. Jason and itzkoolkidkam would know, check their sick setup out. 
Anyways, I would like to debunked some of myths out there on wheels and tires combo. What can you use and what can't you use. Post your questions here and I'll help you.
I'll start. The first common question as follow:
Q: The X5M uses 285/40/20 (or 285/35/21) front and 325/35/20 (or 315/30/21) rear, does running narrower or wider combos throw an error code?
A: Not really. OEM X5M 285/40/20 (or 285/35/21) front and 325/35/20 (or 315/30/21) have overall height of 736mm front and rear. This means there is 0% delta between front and rear rotational diameter. As long as your new setup has a 0% rotational delta between front and rear, it will not be an issue.
Example A, 275/40/20 F and 315/35/20 R both have a total tire height of 728mm. This means when paired together for front/rear, there is a 0% delta on rotational diameter front and rear. Your car ECU will not sense any issue with this setup.
I hope this is helpful, please post more questions. I'd love to hear them. |
Interesting timing on this post. Question - What about running 275/40/20 tires on 285/40/20 rims and 315/35/20 tires on 325/35/20 rims?
I am finding there are few options for the new 285 front and 325 rear 20" set up on the F86. Almost no options/availability for snow/winter tires even running 285 front and rear, but plenty of choices for 275 315 combo. The 10 mm difference in width is less than 1/2 inch. I've been told that it is done all the time and there is no issue mounting tires slightly narrower than the rims. Is that true?
Thank you.