Birzman Chain Keeper - black/silver

A Chain Keeper (dummy hub) compatible with both QR and 12 mm thru-axle dropouts without switching of parts or adapters. Featuring a free-spinning and side-shifting pulley wheel, allowing shifting of the derailleur and a high polymer spacer providing abrasion protection against dropout surfaces, this is a quick and easy tool to have on hand for routine cleaning and maintenance work. Details of the Birzman Chain Keeper Pulley wheel is compatible with single -13 speed chains. Compatible with both QR and 12 mm thru-axle dropouts without switching of parts. Features a free-spinning and side-shifting pulley wheel, allowing shifting of the derailleur. High polymer spacer provides abrasion protection against dropout surfaces. Material: CNC machined aluminium / Alloy steel / High polymer Size: 140 x 110 x 50 mm