Rear flat...so went to 295/30/20
So I needed new tires, and I went with 265s in the front, and actually had the shop bring in both the 295s and 305s. Irrespective of the math (which was 295 is proper ratio to the 265 fronts, and that the 305 is significantly taller than the 295), when mounted on the wheel, side by side, the 295 is a much thinner tire, and it doesn't match with the beefy 265s up front. So I went 265 + 305, and they look PERFECT. Definitely fills the fender gap very very nicely. And I love the look of the beefier tires. I'm also not breaking traction from a stop (coming off the line at a light) accidentally anywhere near as much. Oh, and these tires are MUCH quieter than the PSS that the car came with originally.
About your tire choice...your post all makes sense and to each his own on how to mod their car. I personally have seen a couple of C63S coupes with the 305 on the rear (one was an Edition One just like yours) and I did not like the look of the bulge on the side of the wheel...I feel the 295 fits perfect and much better than the stretched 285 but yet not too tall. But that is just my opinion.
However, my car is now modded and when I go 1/2 mile race (on my Race Fuel tune) I may need to throw on some stickier 305's just to try and get better traction. Maybe Toyo R888R??? But for street driving and the look I want I am totally happy with the 295 PS4S.





However, my car is now modded and when I go 1/2 mile race (on my Race Fuel tune) I may need to throw on some stickier 305's just to try and get better traction. Maybe Toyo R888R??? But for street driving and the look I want I am totally happy with the 295 PS4S.
Oh I would not run the R888R all the time...either have my shop throw them on prior to 1/2 mile racing and then swap back after racing (my AMG is not my daily) or get another set of wheels. PS4S are my street tires for sure.
So I needed new tires, and I went with 265s in the front, and actually had the shop bring in both the 295s and 305s. Irrespective of the math (which was 295 is proper ratio to the 265 fronts, and that the 305 is significantly taller than the 295), when mounted on the wheel, side by side, the 295 is a much thinner tire, and it doesn't match with the beefy 265s up front. So I went 265 + 305, and they look PERFECT. Definitely fills the fender gap very very nicely. And I love the look of the beefier tires. I'm also not breaking traction from a stop (coming off the line at a light) accidentally anywhere near as much. Oh, and these tires are MUCH quieter than the PSS that the car came with originally.
So that was the good.
The bad? It's definitely not as nimble, and noticeably so. Makes sense given the heavier and larger tires up front. I also am not sure how much the tire pressures are playing a role. Sticker on the gas cap door says for the 19/20 inch wheel setup, 44 lb front, 39 lb rear (IIRC). Tire shop seems to think that's REALLY high. And I know that high tire pressures can definitely make a car handle very differently. What are you plus-size guys running your tire pressures at? I was thinking of trying 38 front and 36 in the rear.
EDIT: I finally got around to adjusting the tire pressures; brought them down to 34 front and 32 rear yesterday. Drove to work today, and it’s like a totally different car. Very light and nimble! In fact, I think she feels even better than with stock tire sizes - and now I don’t spin the tires accidentally at stoplights! The tire pressures definitely did the trick. And I’m super happy. Thanks!








Having said that, YMMV, literally, as tread wear is multifactorial. Suspension settings, mileage, and heat cycles affect it greatly. I got a lotta miles outta mine because my heat cycles were minimal. 98% of the time was highway driving for 50 miles each way to and from work (vs stop and go etc).
The Best of Mercedes & AMG


