Elliptical Bike Crank

The idea was that the large radius of the chainwheel would drive the chain when the cranks are horizontal and the small radius would pull the chain when the cranks are vertical.

Elliptical bike crank.

Elliptical rings for everybody depending on bolt circle or mounting type wolf tooth s pte ring is available in tooth counts from 28 to 42 teeth in designs to fit most modern cranks including. To clear up any confusion the chainring does not produce more power. With its combination of quality and performance at a great price the elliptigo arc 8 quickly became the top selling stand up bike in the world. Around the turn of the century shortly after the development of the chain driven bicycle someone came up with the bright idea of elliptical chainwheels.

Simply put the oval or elliptical chainring helps maximize the power you personally put out when you are at an optimal part of your pedal stroke to lay it down and allow the bike to be a little easier to pedal when you are in the non optimal part of your pedal stroke. That shimano manufactured an elliptical chainring in the 1980s called the biopace and aside from a few love letters the component was generally panned for causing undue stress on the knees.