Hub roller brake that eliminates the need for exposed cantilevers Braking power modulator (built into hub shell) prevents wheel lock-up.
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122mm cooling FINS for use with Roller Brake compatible hubs only includes cable adjust unit and cable fixing unitShimano NEXUS Roller Brakes use a precision cam-and-roller design that delivers strong yet easily controllable braking power. Sealing channels keep out dirt and water to assure safe and dependable braking performance in wet or dry conditions.