The manual on command online has information re size of winter wheels and tyres for 17 and 18" setups. For 17" on doth axles... tyres:225:50 1794 94. Wheels:7.0Jx17 H2 ET 4 8.5I've been in touch with MB "Customer Service" about winter tyre sizes for the C350e. As you probably know, certain options on the estate model force you to have 18" wheels, and I was interested to know if I had to stick with this size for winter. There is no information in the manual or on the car.
Their reply in italic:
I can confirm that the best winter tyre for your Mercedes-Benz vehicle is the Pirelli - Sottozero 3 (95) load rating (H) Speed rating (Non Run-flat), this tyre is the same size as the tyres that are currently fitted on your Mercedes-Benz vehicle. (i.e. 225/45/18 front and 245/40/18 rear.)
My Technical Department also advised 17 inch winter tyres for your vehicle:
Front - 7J X 17 H2 ET48.5 (225/50/17 tires)
Rear - 8J X 17 H2 ET54 (245/45/17 tires)
So it would seem we can drop to 17" rims for winter which helps a bit with costs. They clearly don't want to drop from a non-staggered setup though which is a shame. Must be all that battery weight they are worried about!