A completely enclosed spring in an automatic chain-tensioning device does not deteriorate through dirt ingress and requires neither adjustment nor maintenance.

The new Zetasassi automatic chain-tensioning device from R A Rodriguez is characterised by its completely enclosed spring. Unlike its competitors whose springs are exposed to the rigors of the manufacturing environment, the patented Zetasassi product does not deteriorate through dirt ingress. It therefore promises a much longer service life and requires neither adjustment nor maintenance.

Twelve models complete this new range.

Each device comprises an aluminium body into which run two galvanised steel rods.

Attached to these rods is the tensioning head made from high-density polyethylene.