SM-RT64 Disc Brake Rotor Options:SM-RT64-M Disc Brake Rotor with External Lockring - 180mm, Center Lock, Silver the T-Type derailleur mounts around

the T-Type derailleur mounts around the wheel axle itself

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SM-RT64 Disc Brake Rotor Options:SM-RT64-M Disc Brake Rotor with External Lockring - 180mm, Center Lock, Silver the T-Type derailleur mounts aroundThe Shimano SM RT64 disc brake rotor delivers powerful and consistent braking performance in all riding conditions. The Center Lock mounting system makes installing and removing rotors quick and easy, thanks to the spine mount and lock ring design. Compatible with both resin or metal pads Includes external type rotor lockring