1880 , England: Thomas Humber adapted the block chain for use with his range of bicycles.
A block Chain is a chain in which the alternate links are broad blocks connected by thin side links pivoted to the ends of the blocks, used with sprocket wheels to transmit power. Block chains had solid blocks as inner links, without rollers. It had a 1" pitch with 3/16" wide blocks, the same as the "skip link" roller chain that appeared on the market about 1930 to replace it.
The remaining stock of block chain was coveted by track riders who believed it was the only chain strong enough to withstand their imagined strength. Though the stock of block chains finally ran out in the late 1970's.
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