Chain tensioners
I machined these chain tensioners from AISI 304 stainless steel for use on Bates B.A.R. bicycle. The Sturmey-Archer ASC rear hub is held in place using the classic wing nuts. These wing nuts do not provide sufficient torque to keep the axel properly located in the dropouts. Given the thickness of the dropouts, the standard steel frame tensioners would not work, hence the custom job.
The tension rod was machined from 3/4 in. rod with the threaded portion eccentric to the centerline such that the spacers would lie flush with the side of the dropout. The clamps were grooved to match the rear radius and thickness of the dropouts.
Photographed using a Sony NEX 5N using a Nikkor 85mm f/2 lens.
Chain tensioners
I machined these chain tensioners from AISI 304 stainless steel for use on Bates B.A.R. bicycle. The Sturmey-Archer ASC rear hub is held in place using the classic wing nuts. These wing nuts do not provide sufficient torque to keep the axel properly located in the dropouts. Given the thickness of the dropouts, the standard steel frame tensioners would not work, hence the custom job.
The tension rod was machined from 3/4 in. rod with the threaded portion eccentric to the centerline such that the spacers would lie flush with the side of the dropout. The clamps were grooved to match the rear radius and thickness of the dropouts.
Photographed using a Sony NEX 5N using a Nikkor 85mm f/2 lens.