Break your bike - so that it can travel
What is a BTC™? 
An S and S Coupling™ also known as a Bicycle Torque Coupling™ or BTC™, is a precision lug that is installed in a bicycle frame when it's manufactured to allow it to separate and pack for easy transportation. Some builders will even install or retrofit BTCs™ into an existing frame. With this system, a full size road or mountain bike will fit completely inside a single 26" x 26" x 10" case that travels as regular airline luggage. Some framebuilders manufacture full size tandems that will fit complete, including the wheels, in the same case!
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