also, nitrogen for street tires/street cars is mainly a waste...https://jalopnik.com/heres-the-deal-...res-1795659391

 

I'll check my door jam later today when I work on my E63. Honestly recall seeing 42psi front and 45psi rear, but will double check to confirm.

 

 

just revisiting this with an update.

turned out the wrong profile size tyres were fitted to my front rims. 245/30 instead of 245/35 so the tyre was stretched onto the rim which was exposing the inner edge to wear due to camber. very frustrating that i didn't realise till i had ruined two sets of tyres and that none of the tyre shops nor the wheel aligner had picked up the problem. now have 245/35 fitted which look so much better on the rims. i'm still offloading the 20" though as they're terrible to live with on poor quality rural roads.

 

I run 245/30-20 in the front of my car. Haven't had any issues. Different tire brands and models do have different "actual" size and shapes. I recently swapped out the below set of tires by accident to 255/30-20 and 285/30-20 Sumitomo HTR III's and the 255's in front in different brand and model seem to look like they have a shorter side wall than my previous 245 tires. This was the case until I properly inflated the tires to a higher pressure. Probably because the V12's have a twice as thick sidewall. The V12's rears were due for a change and the fronts had 30% left so swapped out all 4. The V12's hide low pressure very well due to the double thickness sidewall. the HTR's do not which also can be a concern if driving around on low pressure for an extended period of time.

Sizes Ordered:
Size & Description
245/30ZR-20 HANKOOK VENTUS V12 EVO2 XL
285/30ZR-20 HANKOOK VENTUS V12 EVO2 XL

 

yes the different brands all have different carcass widths. they also have different characteristics when it comes to stiffness of the sidewalls. with my 245/20 you could see the bead of the tyre was not really set into the lip of the rim properly. quite possible they were a narrow carcass tyre. i cannot recall if that was the case with the set that wore the same prior to these though? both were cheap tyres. next time i will be investing in better tyres

 

IMHO I always thought that 19" was the optimal size wheels for either a E55 or E63. As you still have a decent side wall height off the rim, compared to 20"
And you have a better looking wheel as compared to 18" Yesterday at Burger King, there was a guy with a BMW 7 Series with 22" wheels.
He is just one pothole away from possibly buying a new wheel and tire.

 

well the 20's will soon no longer be my problem. today i arranged a swap with a guy for a set of AMG optional rims from a 2012 E500. yes they aren't perfect for my car, but they will do temporarily till i save and buy some 19's in a style i like.

 

done & dusted. these will do nicely till I can save up for a decent set of 19" aftermarket rims