[nikon93]

Are the tires I have in the allowed circumference tolerance for the 4matic? Is 1,5% difference OK for the 4Matic? Or should I go with 295/25/R20 on ther rear, but I don’t think if they will even fit on 9.5J rim?
Now I have:
F: 255/30/R20 on 8.5J
R: 285/25/R20 on 9.5J

OEM sizes are F:255/40/R18-R:285/35/R18 and F:255/35R19-R:285/30/R19

 

[Edubz500_430]

Input your info on this site

Rim & Tire Size Calculator. Custom Offsets

Tire Tech Information - The Wheel Fitment, Tyre Stretch, Rolling Radius and Speedometer Error Calculator. Play with specs, try different settings, compare results

www.wheel-size.com

This should help
R,
Edubz

 

[nikon93]

I did check on that site and the circumference difference is 1.5% (30mm less in rear tires). I just don’t know if 4matic tolerate such difference (OEM 19” has 1.2% tolerance).