Can someone tell me the front/rear rim width off a 2000 C4? It's got the 18" 'turbo twist' looking wheels. I'm seeing 10" rear pop up via search, but the tires seem rather small at 265.

Thanks

 

I can't tell you for sure on your specific year and model, but I can add a small amount of value here...

2003 C2 18" rims are 8" front and 10" rear. I am currently running 265 on the rear, though when I burn through those I will likely go up to 285. The 265 rears are original equipment from Porsche, though these rims are actually take-offs from a 997 (long story).

Somewhere there are tools for calculating which tires fit which rim widths, and I've heard of people going up to 305 on 10" wheels. Personally, I won't go above 285, as I had minor rubbing issues with 295s (when I was running an 11" rear rim). And rear traction is not a problem at all for me, so why push it?