Track Cog Lockring city bike Thanks to the unique Seat-Lock

Thanks to the unique Seat-Lock attachment system

Width 17" / 43

we've obsessed and honed the details for a bag you can rely on for years

and loaded bikepacking routes where reliability matters

Track Cog Lockring city bike Thanks to the unique Seat-LockDescription Surly's Track Cog Lockring was designed in conjunction with their Track Cog, and as such, they go together like hamburgers and hot dogs. Its now a full 5mm thick, plus a lip (0. 65mm extra) to maximize thread contact on all compatible hubs. Fits English lockring threads (1. 29 x 24tpi LH) to work on almost all track hubs available today except Campagnolo (1. 32 x 24tpi LH) and French (33mm x 1mm LH). Compatible with standard ISO threaded