Design Objectives


The Velotegra Hub design has the following objectives:

Low internal friction: The hub uses sprockets meshing with roller teeth, rather than conventional gears. This reduces friction and wear by replacing sliding friction with rolling friction.

High torque capacity: The sprocket teeth and roller teeth are larger than conventional gear teeth. This increases the torque capacity of the hub. The torque limitation of conventional hubs can prevent use in tandem bicycles, where the applied torque is higher.

Direct-drive option: The higher torque capacity and higher gearing of the hub are well suited to direct-drive, where the pedals drive the hub directly with no intermediate chain. To take advantage of this, the hub is designed to be adaptable between direct-drive (below, right) and conventional chain-drive (below, left). Direct-drive has many benefits, particularly in the front-wheel-drive recumbent format – see the direct-drive recumbent section. Conventional hub transmissions are incompatible with direct-drive.

Mono-blade mounting option: The hub can be mounted to the bike on one side only (mono-blade mounting) as well as conventionally. Mono-blade mounting has several advantages: tire change without wheel removal; simplified frame design; and a more compact fold for folding bikes. Conventional hub transmissions are incompatible with mono-blade mounting.

Direct drive monoblade bike 4Chain drive standard bike 4