DEBATING ON 19s rims and 20s rims c400
Brabus will not be developing an exhaust for the C400, going forward they may end up building one for the C350 and C450, but those cars are still going to take some time to be released and then have the part engineered and produced.
Putting a 10 or 10.5 rim on the rear of your car is only going to stretch your rear tires even more...I would suggest to reduce your effort of being creative with tires and run exactly the tires you have on the car with an 8.5/9.5x19 rim combination. 8.5/9.5 is a common application for 19 inch wheels throughout the market, those sizes with a ET45 offset will be suitable for your vehicle.
Jim

If you have a 4matic car, I would not venture to experiment too much with extreme staggered sizes, this could have negative effects on the AWD system.
If you are planning to run 10.5 rims because you are just wanting to say you have 10.5 rims to be extreme...keep in mind that it is a Luxury Mercedes-Benz.






