Bicycle Torque Coupling

A BTC in the down tube of a touring bicycle
An S and S coupling equipped Burley packed in its cases

An S and S Coupling also known as a Bicycle Torque Coupling or BTC is a coupling which enables bicycle frames to be separated into smaller pieces, usually to facilitate packing and transporting. Couplings can be built into the frame by the frame manufacturer when the frame is made or can be added to a frame after it is finished. A special spanner is available for tightening and loosening the couplings.[1]

  1. ^ "S and S Machine". Archived from the original on 2007-10-20. Retrieved 2007-10-19.{{cite web}}: CS1 maint: bot: original URL status unknown (link)