DMR Chain TugsSuitable for use with single-speed rear mountain bike (MTB) wheels, these Chain Tugs from DMR are the ideal tool for anyone who misaligns their rear-wheel or stretches out their chain. Features:Use: Mountain Bike (MTB)CNC machined to fit 10mm axles14mm version includes reducers for 10mm axle in 14mm framesMade in the UKWeight: 18gBuy DMR Frames & Forks from Chain Reaction Cycles, the World’s Largest Online Bike Store.