Zenith Gradua

Framed picture from Road Bike published by Marshall Cavendish in 1979

The text below the pictures reads:- 

Before gearboxes were invented, hill climbing was usually an exhausting business for motorcyclists, involving either furious pedalling or pushing. In 1909 Zenith developed a system of expanding pulleys to vary gearing from 3:1 to approximately 8:1 in which the rider energetically wound the long "coffeegrinder" handle standing beside the tank to change the ratios. This device was so effective that the ACU banned all Gradua models from competing In speed trials with single-speed machines. This is a 1920 model fitted with a 750cc JAP side valve engine.

Super picture framed in an A4 (29.7 x 21 cm, 12 x 8.3 inch) size clipframe.

The picture offered does NOT have the "SAMPLE" watermark!!