Shimano
Dura-Ace RT900S Centerlock IceTech Disc Brake Rotor

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Shimano Dura-Ace RT900 Centerlock Disc Rotors

Aluminum spider
Freeza technology, 3-layer structure with aluminum core and stainless steel outer layers and additional aluminum cooling fins reduces rotor surface temperature approximately 150 degrees Celsius compared to all-steel rotors
Includes standard type rotor lockring
Requires external-type rotor lockring when installing onto 15/20mm axle hub