507AMG

Stock rear rotor with 9800 miles of wear weighing in at 23.5 lbs. New RB rotor weighing in at 15.4 lbs. Just shaved 8.1lbs of unsprung weight per side!

Klinh

Wrong forum.

507AMG

You are basing that on my user name? This is for a 2017 W205 c63s. Correct forum indeed.

tobeit

cool, what brand and are these direct replacements?

///Bruce

Racing Brake is the name of the company. I used them for 2-pc rotors on my former 09 ML63 AMG tuned to 550HP. Very very good product.

Klinh

Yeah .... lol

Davedg

Steel or carbon?
direct rotor only replacement or does it need new pads and other parts to convert?

AMGMD

iTrader: (1)

Do you know how much lighter the RB front rotors are compared to C63S stock rotors?

507AMG

Racing Brake. These are %100 direct replacement. No special pads or anything are needed. I have the Carbon front rotors so I cannot do a weight comparison for the group but these on the rear are a ridiculous weight saving. Extremely high quality product.

Schulminator

Pretty sure the RB fronts were around +/- 15lbs lighter per side.

tobeit

$1500 for just rear is pretty steep, how much are the OEM anyway? Probably makes sense if you have to replace OEM.

untamedd

OEM rear rotors from the dealer were approx $900 CAD. I got the Brembo ones which is what OEM is for $500 CAD.

RB rotors are good and lightweight but probably more suited for a car that visits the track often

507AMG

Unsprung weight is about acceleration as much as anything. The less weight in the wheels/brakes, the easier it is for the engine to spin it. If this is solely a cost conversation then it becomes to subjective as value is perceived. I'm happy to sell my mint OEM rear rotors if anyone is interested. I really never thought about it. They show almost zero wear.

Amme

I also have the carbon front rotors and was looking for carbon for the rear as the brakes dust a lot (and front nothing)
I believe the SL65 and SLS rotors fits directly also and they are two piece rotors with weight saving. But these are much better, and of course more expensive

507AMG

Couldn't agree on the front carbon brake more. Love them and no dust. Sadly, since carbon on the rear is to much $$$, I've conceded to the dust of the OEM pads (have tried many aftermarket "low dust" pads). A friend told me that more dust usually means better stopping power and I'm inclined to believe that might be true. I'm not knocking the low dust pads but I can say I believe the OEM pads stop better (yes I know, with less dust). I'm sure the flaming will begin so I'll say again, this is just my opinion. Stopping is my first priority.

Amme

Agreed. Never mind the flaming they dont know what they're talking about
How is the dusting with these rotors? Is it the same? How about wear? Maybe too soon