The “Claw” frame mount
"Claw" Frame Mount
The Claw is one of the simplest mounting brackets you can find. One captive screw to clamp both the frame and the Quantum at the same time. What could be easier? Requires the separate purchase of the Quantum tube adapter. The tube adapter will accept a standard shifting cable end cap. Available in multiple sizes. If you have a Brompton, please verify the frame tube is 13mm, as that is standard.