This lightweight rear brake rotor is laser cut and precision ground from high quality 410 Stainless Steel and is more than a pound lighter than the OEM rear brake rotor. This is for closed course race use only. Yes, if you were wondering, this will actually still stop the bike just fine with the rear brake, however it does reduce braking forces, especially at higher speeds.
The OEM rotor weighs 2 lb. 4 oz. and this lightweight rotor weighs only 1 lb. 2.7 oz!