Unior 1644/6 Chain Wear Indicator

The Unior 1644/6 chain wear indicator tells you whether your chain needs replacing. It is for anyone maintaining bikes at home or in a workshop, with 6- to 13-speed chains.

• Check your chain in around three seconds: insert, press lightly and get a yes or no
• Works with 6- to 13-speed chains, including SRAM flat-top and AXS
• Wear thresholds already set: 0.5% for 11-, 12- and 13-speed chains, 0.75% for 6- to 10-speed chains
• Lightweight and pocket-sized, it weighs 20 g and is made from laser-cut steel
• The QR code on the body takes you to the video instructions

Technical specifications

• Item code: 629344
• MPN: 1644/6
• Material: Precision laser-cut steel
• Dimensions: 178 × 45 × 29.4 mm
• Weight: 20 g
• Compatibility: 6- to 13-speed chains, including SRAM flat-top and SRAM AXS flat-top
• Wear threshold for 11-, 12- and 13-speed chains: 0.5%
• Wear threshold for 6- to 10-speed chains: 0.75%
• Instructions: QR code on the body links to video instructions

Unior was founded in 1919 in Zreče, in present-day Slovenia, where it is still based. For bicycle care, it makes tools, repair stands and wheel equipment. Its name, adopted in the 1970s, comes from the expression “universal tools” and reflects its roots in metalworking.