AMGPower88

So I have the stock 18" wheels on my 2008 C63, I was considering getting 245/40/18 tires for the front and 275/35/18 for the rear tires. Are the rears going to be too wide and surpass the fender line? Should I go 265/35/18 just to be safe for the rears? Will be lowered on coilovers soon. Any help is appreciated, thanks.

wampire

you can do it but thats a max and if you take a car on a track my tires were roling to much so i bought wider rims in the end

those a pictures on my c63 245 in front and 275 rear on stock rims taken just before i changed the rims

wampire

same tires on a new rims looks much better and they dont roll on a track

AMGPower88

Those are stock 19" rims? Anybody have experience with the 18" stock rims with the tire sizes I want to upgrade to???

zibby43

Keep in mind, the wider you get, the further you get from the factory spec.

Going too wide will have negative impacts on the following: handling, ride comfort, grip (yes, this is possible even when going wider), etc.

drawde

I run 275/35/18 PSS in the rear with no issues. I am at stock height though.

Sidv22

Pardon my ignorance, but whats the point of going with wider rubber in the rear?

zibby43

Since it's a RWD car, wider rubber in the rear = more traction/better grip (up to a point).

I think 265s are plenty for this car (stock). 275s on 18s = a great combo for those that are tuned/modified.

When you get beyond 275-section rears (on OEM 18s) with this car, funky things start happening.

AMGPower88

Yea, Im looking to get better traction and grip on the rears.. These stock tires are too narrow as well.. Might just go 265s then, I dont want to mess with the sidewalls so I'll leave the front at 40 and the rears at 35...

abcut973

you can do 275 on rear 18 OEM wheels with OEM suspension. That is what I had on mine before swapping for the CF10.
I would say even lowered you will have no problem with 275 and 18 stock wheels.
Since you will be lowered soon on coilovers this is even better to adjust your height to your liking.
So I would suggest you to get 275. Don't settle for 265.