SHIMANO Smrt66 6 Bolt Slx Rotor Black, 20.3 cm

Reliable and easy anti-loosen plate Metal pad compatible Stainless steel braking surface improves pad clearing in muddy conditions while aiding cooling under high load. Fitment varies from IS (International Standard) 6 bolt to Shimano's new Centre Lock splined common for rotors to be different sizes from front to rear, with the front usually having a rotor one size up from the rear