Specifically designed for use with E8000 / E6000 systems for rear wheel use only, this disc rotor offers smooth and dependable performance on every ride. It uses a revolutionary stainless steel and alloy three-layer sandwich construction, which allows heat build-up to be reduced quickly through its aluminium core. This also allows it to achieve surface temperature drops of around 50 deg C. When used with Ice Tech pads surface temperatures can drop from around 400 to 300 deg C, this provides great improvements in performance all round. - FREEZA rotors allow the alloy core to extend out from the braking surface as a fin to provide added cooling - Ice Tech rotors achieve long pad life, less noise and less fade due to improved heat dispersion - Rotor houses the magnet necessary for speed sensor function on Shimano STEPS equipped E-bikes allowing frame clearance for wider tyres - Rotors are durable lightweight and rigid, using the proven Shimano Centre Lock system giving increased strength and security with an easy set-up - Precision cut and drilled braking surface improves pad clearing in muddy conditions while aiding cooling under high load