The Wheel and cycling trade review . ment with the balls rotates freely withoutmoving the chain when the wheel is coasting,and when the chain is drawn forward one ofthe balls drops against a square shoulder(which prevents wedging), and causes thetwo segments of the sprocket to work to-gether as firmly as if they were one piece ofsolid steel. By making the interior spaces.

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcyclist, bookyear1888