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The Mad4One unicycle hubs

cotterless CrMo-4130, standard ISIS CrMo-4130,

standard ISIS AL-7075-T6, 6-Pin and  6-Pin short AL-7075-T6



The hubs differ first of all in the shape of the interface between hub and crank. We have the following interfaces:

  • Standard cotterless
  • Standard ISIS
  • NON Standard (or proprietary).


What is meant by non standard or proprietary interlocking shape?

It is similar to the ISIS ones, but different in size, so that cranks and hubs have to be of the same manufacturer and must have the same design. With the definition "proprietary" we understand that the system is used only by a producer. It is the contrary of "standard", which means that the product is "open" and can be used also with elements from third parties.

Among the "proprietary" ones we have:

  • QX Q-Axle
  • Mad4One 6-Pin
  • Mad4One 6-Pin Short


The Mad4One 6-Pin Short

The Mad4one's track racing unicycle RACE REVOLUTION, developed in 2011 (5 gold medals at the World Championship 2012 in Bressanone - UNICON XVI), and further improved in 2018 (8 gold medals with Niklas Wojtek and Alina Czimek at the World Championship 2018 in South Korea - UNICON XIX), has a specifically designed interface.

Why have we moved away in this case from the ISIS concept and therefore from a standard approach?
To increase the effectiveness of the force we apply when we push on the pedals, it was necessary to reduce the distance of the feet from the center. To achieve this, we developed a hub-crank interface that is less bulky than the ISIS one. Click HERE to read more.


We have to consider the following aspects:

1. the distance of the flanges

The more the flanges from which the spokes start are distant from each other, the more the spokes will be inclined and the more resistant the wheel will be. On the contrary, the wider the flanges, the less space will be available for the frame and bearing holder. To ensure total compatibility of our hubs with all frames available on the market, the distance between the flanges of our hubs is approx. 68mm (100mm hub).
The wheel of the unicycle undergoes great lateral stress, much greater than the one a bicycle is usually subject to.


2. the Q-factor

The Q-factor is basically the distance between the pedals. We have:

  • the Q-factor induced by the hub, which is the distance between the crank arm inserted on the hub and the center line of the wheel
  • the Q-factor of the crank arm, which is the distance that the crank arm adds to the hub Q-factor. If the crank arm is at 90 to the hub, the Q-factor of the crank arm is 0, the more the crank diverges, the more the Q-factor increases.

The closer the pedal is to the center of the wheel, (lower Q-factor) the greater the efficiency of the force we apply on the pedal (our wheel will be more responsive and faster).

With the same bearing width (the standard is 100mm) the final width will be determined by the width of the coupling (interface).


For more infos on the Q-Factor click here  Q-factor. 


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