Graduation year

2017 / 2018


Vzlt. Otto Jung



Falzberger Markus


Schwentner Georg

Supervising tutors

Kiesl Walter

Kiesl Walter

Mitgutsch Wilfried

Mitgutsch Wilfried

Project description

Racing bicycles are designed to withstand high forces, to drive at high speeds and to be as lightweight as possible.

The cyclist is a very well-trained person and able to apply high torques at the circuit for a long time. But as he pedals forward, he uses always the same muscles. There is no way to transmit torque in the backpedalling process to the rear wheel.

The objective of the project is to make a connection to the rear wheel while pedalling backwards with the bike still driving ahead.

Another goal is a very lightweight design, because the bike should weigh only a few kilograms, because of its racing purpose.

The solution should also be as small as possible. The smaller the gearbox, the easier it can be integrated in the frame of the bicycle. Another reason for a small design is the visibility of the additional feature. If possible, the whole structure should not be visible from the outside.

We made a lot of concepts and in the end we decided to choose the concept which is built up like a gearbox. It is a centrical design and everything is assembled on the shaft, where the cyclist pedals.

The whole gearbox is of course bigger than a bottom bracket of a common racing bicycle, but this is an unavoidable fact. The whole gearbox is integrated in an opening in the frame, where it is bolted together and is embedded safely.