19"s or 20"s
I know that 19"tires will cost more than 20"tires right because of the odd size.
A few have 20's... Some have reported rubbing issues but some also had zero rubbing even with H&R Super Sports lowering springs
It all depends on you... It'a matter of personal taste, If you have plans of lowering your car you'll probably be better of with 19s
20's are more expensive than 19s
It is possible that, of the subset who replace their OE wheels with aftermarket wheels, 18" or 19" may be the most frequent choice, but this is a small percentage of total C Class sold.
It is possible that, of the subset who replace their OE wheels with aftermarket wheels, 18" or 19" may be the most frequent choice, but this is a small percentage of total C Class sold.
My vote still goes with 19... 20's looks nice and is good for show
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O.K......perhaps a bit of poetic license with:
"What size rims are most of you running on your C class???? 19s or 20s, can both fit? "
but, now I understand your point......Happy New Year!
My previous set of wheels were 20" Work Varianza T1s. They did not rub due to safe offsets. They were 42 and 45 offset i believe.
As for the Klassens, i went for a more aggressive offset to flush it out. My front is flush with the fender as for the rear i will be swapping out the barrel for another 1inch to 1.5inch.20s will fit under 30 profile tires. Anything higher will cause rubbing. If you are on a budget go with 19s. Otherwise go big or go home.

Here are some of the specs:
Current:
- 20" Klassen K5.1 (20x8.5 / 20x9.5)
- Falken FK452 Tires (235/30/20 & 255/30/20)
Old:
- Work Varianza T1s (20x8 / 20x8.5)
- Falken FK452 Tires (235/30/20 & 255/30/20)
Hope i was able to help.
Here are some pics:







i assume it is the extra lite forged rims against rest, as of it is only weight around 8.9 kilogram per pc/19''.
i checked that it is even lite than my AMG 17'' both with tires of coz,
i think once you pick the GC-05K by your hand, and after that you pick rest rims you will easy see what is the diff......
My previous set of wheels were 20" Work Varianza T1s. They did not rub due to safe offsets. They were 42 and 45 offset i believe.
As for the Klassens, i went for a more aggressive offset to flush it out. My front is flush with the fender as for the rear i will be swapping out the barrel for another 1inch to 1.5inch.20s will fit under 30 profile tires. Anything higher will cause rubbing. If you are on a budget go with 19s. Otherwise go big or go home.

Here are some of the specs:
Current:
- 20" Klassen K5.1 (20x8.5 / 20x9.5)
- Falken FK452 Tires (235/30/20 & 255/30/20)
Old:
- Work Varianza T1s (20x8 / 20x8.5)
- Falken FK452 Tires (235/30/20 & 255/30/20)
Hope i was able to help.
Here are some pics:








what are you lowered on???



