SwissStop Catalyst Pro 6 Bolt Disc Brake Rotor

Not the lightest disc, but a few extra grams worth it for the stopping power. It lives up to its claims - I am really impressed. After the first one, I bought two more for other bikes. Great on the rear of your mtb or cx so that you can just lock it the instant you want too to swing the rear around when you want to, but despite the stopping power, feel is great. I have found though that it is slightly thicker than most discs, this can be good or bad. If you have race wheels and don't have the same disc on other wheels, then this will be hard to get in and have a lot of rub after a wheel change. However if this is you race wheels and go to another wheel that has say an xtr disc, then the wheel swap is easy as and no brake rub.