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Schlumpf Geared Unicycle Hub (Pre-Order)

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The completely newly re-designed Schlumpf geared hub for 2022, now comes in a range of options.  Call before ordering and we will give you a predicted delivery date.

Orders will take a 50% deposit and the remainder will be requested before dispatch. Discount will be automatically applied at checkout.


The new for 2022 Schlumpf geared unicycle hub.

So what is a Schlumpf Geared Unicycle hub?

As standard unicycles have what we call direct drive, so that is a gear ratio of 1:1. So for every 1 revolution of the pedals, the wheel does 1 complete turn. This hub has a gear inside which means for every 1 pedal revolution the wheel will have rotated 1.5 times. Because of this gearing the rider can travel faster without having to pedal faster, thus maintaining a higher speed and helping to travel further with less fatigue. This means: a 24" is like a 36", a 29" will run like a 44" and a 36" like a 54"! You change gear by knocking a shift botton located where your crank bolts are, this is done with the inside of your heel when the crank is pointing forward (it takes a bit of practice to get this smooth).

The new hub is available in 2 bearing widths so it will now fit a wider range of unicycles, including but not limited to, Kris Holm 100mm and Nimbus (32”, 36” & Hatchet) 125mm.

This latest hub has a couple of great new features. The first feature of the new hub is that it is disc brake ready. The disc rotor mounts directly to the outer hub body, so rather than having to mount the rotor to the cranks (external of the frame, like on the older version) it is now inside the frame. With the rotor now being mounted to the hub outer shell the brake forces don’t go through the hubs gear box. This removes the risk of damage being caused by braking forces going through the gear mechanism. Due to the size of the hub casing, you will need to get the Schlumpf specific disc rotor (select size in the drop down) A standard bike disc rotor will NOT fit.

What size rotor to go for?

Schlumpf is producing 3 different sizes of rotor, 160mm, 180mm & 203mm. Smaller rotors are good for lighter riders and riders that don’t drag their brakes for long periods of time (on descents for example). While the larger rotors are better for riders that use their brake alot, the additional size helps with heat dissipation and reduces brake fade.The second new feature is an additional option, should you want it. The new hubs can come with a freewheel function, which means you can have the wheel spin freely without you having to pedal (just like a freewheel on a bicycle). This option is available either after going into high gear or when in Low gear. Select No Freewheel Function if you don’t want this

What hub do I need for my Frame and rim setup? below are a few popular combinations.

        • Kris Holm 24”,26”, 27.5”, 29” & 36” with Kris Holm 36-hole rim you need: - Schlumpf Geared Unicycle Hub (100mm -36 Hole)
        • Nimbus Hatchet 26", 27.5" & 29" with Nimbus 36-hole rim you need: - Schlumpf Geared Unicycle Hub (125mm -36 Hole)
        • 32 & 36” Nimbus Oracle with 32/36” Dominator rim 36-hole you need: - Schlumpf Geared Unicycle Hub (125mm -36 Hole)
        • 24”- 29” Nimbus Oracle with 24” - 29” Dominator rim 36-hole you need: - Schlumpf Geared Unicycle Hub (100mm -36 Hole)
        • Qu-Ax RGB all sizes with standard 36-hole rim you need: - Schlumpf Geared Unicycle Hub (100mm -36 Hole)

How do I know which hub I require? What to check to make sure you order the correct hub.

        • Your frame needs to be designed to take 42mm bearings
        • You need to know whether your fame has 100mm or 125mm Bearing spacing (Generally kris Holms are 100mm, Qu-Ax RGB's are 100mm, Nimbus 24” – 29” are 100mm and Nimbus 32", 36” & Hatchet are 125mm) always check if you are not sure.
        • How many spoke holes your rim has, either 32 or 36.
        • And if you are wanting to have a disc brake, then ideally you will have a disc brake Caliper tab at the bottom of the left-hand fork leg.
        • If your frame does not have a disc tab on the left-hand leg of your frame you have a couple of options.

          Use a Nimbus D'brake mount or get the Brakefast Tab kit and weld the Brake Caliper mount to your Aluminium frame.

Hub Specification

        • Axle System: ISIS
        • Color: Black
        • Diameter Axle: 22mm
        • Bearing width: 12mm
        • Bearing Diameter outside: 42mm
        • Bearing Diameter inside: 22mm
        • Gear Ratios: 1:1 and 1:1.5
        • Crank bolts: M12 incl. hole for the shifting shaft (6mm Allen key)
        • All hubs are supplied with 8mm drill jig for anti-twist frame hole.
        • For spoke lengths please check our spoke calculator.

Schlumpf Geared Unicycle Hub (100mm - 36 Hole)

        • Bearing pitch: 100mm (center - center)
        • Spoke holes: 36
        • Weight: 1650g (incl. bolts/Shift Button)

Schlumpf Geared Unicycle Hub (100mm - 32 Hole)

        • Bearing pitch: 100mm (center - center)
        • Spoke holes: 32
        • Weight: 1650g (incl. bolts/Shift Button)

Schlumpf Geared Unicycle Hub (125mm - 36 Hole)

        • Bearing pitch: 125mm (center - center)
        • Spoke holes: 36
        • Weight: 1750g (incl. bolts/Shift Button)
More Information
Bearing Size
Crank Type
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