US Patent 7013753 Bicycle crank and method for manufacturing said crank

A bicycle crank is provided comprising an elongated core with a first and second end, a first and second insert are arranged at the ends of the core and a high-resistance coating of fibers incorporated in a plastic matrix material forms a coating for the core and inserts. The core is a preformed element and each insert is connected to the respective end of the core by a union element having recesses to establish a shape coupling with an insert and the respective end portion of the core.