This Single Speed tensioner by Cyclingdeal is a product to allow single speed set up to be run on geared bikes without the expensive modification you had to do in the past. This chain tensioner mounts right onto your derailleur hanger to provide a simple, effective and adjustable way to tension a single speed system.
Fits 1/8" single speed chains ONLY. To avoid from chain drop, we recommend to use round and oval shape chains only
Material: Aluminum alloy. 11T Plastic pulley. Weight: 250g. Adjustment tensioner included