The Birzman Chain Keeper (New) is a dummy hub that fits both QR and 12mm thru-axle dropouts without swapping parts, keeping the chain in place and the derailleur shiftable during cleaning and maintenance.

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.

Specifications

• Material: CNC machined aluminium / Alloy steel / High polymer
• Size: 140 x 110 x 50 mm

Note

• Pulley wheel is compatible with single-13 speed chains
• If the handle comes loose, clamp on to the tool with a 14 mm wrench, then tighten the handle
• All tools should be stored in a dry environment

Sizing Information

• Size - 140 x 110 x 50 mm
• Country of Origin - Taiwan