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sands machine manufacturer

S and SCoupling™ (patented) What is a BTC ™?. AnS and SCoupling™ 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 ...

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