Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 138,170 pages of information and 223,198 images on early companies, their products and the people who designed and built them.

Trebloc Manufacturing Co

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Trebloc Manufacturing Co of Bath, Somerset

Trebloc was a motorcycle attachment produced between 1923 and 1924. This was a 67cc two-stroke auxiliary engine attachment that fitted into the frame of a gents' safety cycle. It could be purchased either as a unit alone or complete and ready-to-ride. The engine was tiny and clamped in the frame. Ignition was by magneto and drive by a sprocket on the crankshaft matching with another on the pedalling bracket, with bicycle chain drive to the rear wheel. The complete machine weighed just 60lb. It was simple, unsprung and intended for use on short journeys, but as it made little impact on the market, the company moved on to pursue other interests.


Sources of Information

  • The British Motorcycle Directory - Over 1,100 Marques from 1888 - by Roy Bacon and Ken Hallworth. Pub: The Crowood Press 2004 ISBN 1 86126 674 X
  • The Encyclopedia of the Motorcycle by Peter Henshaw. Published 2007. ISBN 978 1 8401 3967 9