Sharpie12

Hey guys so heres the situation...

Less than 2 months ago I bought a set of Vorsteiner V-FF103's from a member here that came off his W212 to put on my BMW I8 (they work out pretty well actually) Now 2 months later I'm thinking of buying an E63 and these wheels would obviously work out perfectly. Only problem is that on the i8 I had to put on 245/40-20 and 285/35-20. I'm not 100% sure if the sidewall size would work with the E63, and if it doesn't what size should I get, maybe 255/35-20 and 285/30-20? Thank you in advance.

AHI

255-30-20 and 292-25-20
This is the only setup you can run with Vorsteiner VFF series wheels.

AHI

The i8 and new X1 oddly enough are now 5x112 with a 66.56 bore. Just
Like Mercedes. There is no real reason behind it, although I'd love to know the engineering reasons behind it.

Sharpie12

That's exactly why I bought these wheels, because I was told they would fit.

mikegronholz

vorsteiners recommended tires are 265/30-20 and 295/25-20 for the w212 on the vff 102 and 103 wheels.

spoke to them at great length, many times before ordering (pictured here ... not to imply this is my car, my vff-102 on fedexing their way to me now as are Michelins)

https: //www.instagram.com/p/045GhUMNBo/ ... (space added)

chiromikey

Any info on those offsets, they look perfect!

mikegronholz

Vorsteiners are 20x9 +35 front and for the rear they are 20x10 +42

mikegronholz

you have to be VERY VERY VERY careful on the w212. 255/30-20 have a 93Y load rating. You have to air them all the way to 51psi to get the same loading as the factory loading at 40psi (the 150mph, 2 person pressure).

If you drop to 235/35 in front, you drop to 90Y I think it is. Thats even worse. It starts to get REALY sketch then.

265/30-20 have a 94Y ... just for comparison.

threeMBs

All 255/30-20 tires and XL (or extra load) designated 235/35-20 tires are 92 load (S or standard load 235/35-20 are only 88 and should not be used on any W212) vs. factory 97 load for 255/35-19. Higher pressure is required, but not 51psi. Rule of a thumb is 1 extra psi for each 1 load reduction, so if one uses 40psi for stock 255/35-19 (l97 load), then with load of 92, pressure should be not less than 45psi.

mikegronholz

Um, the "rule of thumb" does not out weigh the LAWS of physics.

A 4250# car, with 55% (roughly) of its weight on the front axle has in total 2340# on the front axle (1170# per side ... Assuming equal distribution).

A 92 can hold 1389# meaning you have left yourself a mere 219# of weight shifting (PHYSICS) when you hard corner, brake hard, avoid an accident, deer, lean on your car at a meet and greet (not to imply the tire will suddenly rupture), etc at MAX PSI. The rule of thumb lies. The laws of Physics don't.

The factory rating is a 96 which carries 1596# per corner up front (rear is different) leaving 417# at max inflation for Physics.

This is what leads to lawsuits in accidents.

44psi on a 92 has a carrying capacity of 1198# (20# for physics ... I sure hope you air gauge is dead on accurate and you never lose air !!!)

41psi on a 96 has a carrying capacity of 1283# (113# for physics)

You have reduced carrying capacity by 100# (roughly) per corner using "the rule of thumb". Physics will kick your *** when given the chance in that configuration!

*tire ratings based on w212 e63

threeMBs

I'm not advocating using 255/30 or 235/35 tires on E63. That's why W212 (including 63) does not come with a 20" option from the factory - lack of proper load carrying capacity for 26" diameter tires, since 245/35-20 (95 load, btw used on 10% heavier S and CL classes with factory setting under 40psi) tire may or may not fit. Ask yourself a question, what was the front psi set to (on your stock 255/35-19 tires) when you took delivery? Not 40psi.

mikegronholz

Mine were at 41psi. At every service, they get aired to that too.

Now, I'm going to 20's and running 265/295 as they are the recommended size. AFAIK that's our best load rating options in 20s.