Shimano rt99 ice tech freeza cl disc rotorshimano places a lot of thought into their disc brakes. The shimano rt99 ice tech freeza cl disc rotor provides consistent braking performance through effective energy management. By using a revolutionary 3 layer sandwich construction of stainless steel and alloy construction that manages heat while riding. The clad steel alloy steel rotor construction allows heat generated from braking to radiate quickly through the aluminium core achieving surface temperature drops of around 50degc. When used with ice tech pads surface temperatures can drop from around 400 to 300degc, this shimano disc rotor provides great improvements in braking performance.featuresfreeza rotors allow the alloy core to extend out from the braking surface as a fin to providing added coolingice tech rotors achieve long pad life, less noise and less fade due to improved heat dispersionrotors are durable lightweight and rigid, using the proven shimano centre lock system giving increased strength and security with an easy set upprecision cut and drilled braking surface improves pad clearing in muddy conditions while aiding cooling under high loadlarge alloy spider is a highly rigid and lightweight support for the rotor surfacesuper polished braking surface gives excellent braking performanceweight 126g 160mmspecificationsmaterial aluminiumcompatibility shimano centre lock hubsattachment type centre lockrecommended use mountain bikingplease note 140mm rotor is for rear brake use onlya 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.