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plural shafties
(cycling, informal) A bicycle that uses a driveshaft instead of a chain to transmit power from the pedals to the wheel. quotations examples
At the rear, you'll find a single, centrally mounted shock, the now-familiar single-sided swingarm and BMW's Paralever shaft-drive system, which does away with most of a shafty's chassis-jacking bugaboos.
1994, Cycle World Magazine, volume 33, number 1, page 49