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Shimano SM-RT30 203mm Center Lock Disc Brake Rotor. This entry-level mountain and road bike rotor is part of the Altus/Tourney component tier.
Diameter: 203 mm (represented by the "L" and "2" in the part code).Mounting Type: Center Lock, allowing for rapid installation and removal.Pad Compatibility: Resin pads only. Do not use metal or sintered pads, as they will cause premature wear.Lockring Interface: Double-serrated design (features both internal and external splines). It can be tightened with a standard cassette tool or a bottom bracket tool.Material: Stainless steel rotor blade attached to a dual-piece aluminum carrier spider.