mojovious

Greetings, I'm new to MB but a long time automotive enthusiast. Just took delivery of a 16 C300 sport and love it so far.


Do any of you know if this wheel/tire combo will fit my C300 without issue? I have an opportunity to pick these up at a great deal, but am concerned they are just too aggressive.


New:
Front - 18x 8.5 width ET 34.5 with 255/40/18
Rear - 18x 9.5 width ET 48 with 285/35/18


I think OEM specs are:
Front 18x7.5 width ET 44 with 225/45
Rear 18x8.5 width ET49 with 245/40


Thanks!

Mike5215

Here's how to figure it out:

Subtract the offset difference in mm vs OEM
(44 - 34.5 = 9.5)

Then add half the extra width of the new tire in mm. (255 - 225 = 30, /2 =15)

15 + 9.5 = 24.5 mm

That's how much space you need up front.

Measure the current gap between the wheel and the fender lip and convert that to mm. In your case you need 1" (1"= 25mm)

That's how much space you have.

Just eyeballing your numbers I think you'll be fine, but do those calculations to be sure.

mojovious

Thanks! My first reaction was too wide and rubbing, inside and/or out. I'll check it out based on your info. Thanks again!

Mike5215

I think you'll be fine with the new set up.