Why use a disc brake? Why would you need a brake at all?

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Two questions I get asked a lot. Until recently the larger unicycles came with the option of running a hydraulic rim brake, it was attached via a braze-on mount on the upper section of the frame. However thanks to the brilliance of pioneers such as Kris Holm we now have the introduction of a

Hang on what the hell is a Schlumpf?!!

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A Schlumpf is an internally geared planetary drive hub made by hand by the genius at Schlumpf Innovations. No it doesn’t free wheel and yes some unicycles have gears. It has a shifting shaft running through the axle with a shift knob on each end where the crank bolt would normally be. To shift