I've just bought my first Mercedes c200 with 16" alloys and I want to put 17" on instead will 7.5j on the front and 8.5j on the back will this be ok thanks.
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They'll fit a treat. The C32 AMG (W203) came with 17 inch wheels, with 7.5j (225/45) front and 8.5j (245/40) rear. Here they are, fitted on my C32 AMG (car now sold):
I still have a set of AMG Style III alloys which I didn't sell with the car. Let me know if you're interested: