S and S Machine
Bicycle Torque Couplings (BTCs)
Your Travel Bike........Your Only Bike!

Bicycle Torque Coupling Deflection Test

These tests demonstrate that in torsion, tension and bending, a tube that has an S and S Bicycle Torque Coupling installed will be stiffer than a plain section of Reynolds 531 bicycle tube. The details of how the fixtures work are included. For a quick review of the results, see the photos with the purple dots. The dots show how much flexing takes place. In each test there is more flex in the plain tube than in the tube section with the coupling. The results and conclusions for each demonstration are also included.

Combination torsion, tension and bending test fixture.
Front view

Back view

The combination test fixture

Standard test criteria

Torsion test fixture

     Tube only           Tube with coupling

Torsion test

Tension test fixture

         Tube only            Tube with coupling 

Tension test

Bend test fixture

Tube only                 Tube with coupling

Bend test

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