The Sturmey Archer SLS-30 Thumb Shifter is a fantastic upgrade for your Brompton Folding Bicycle. While the standard Brompton 3 speed shifter works great and honestly never breaks , it does look a bit flimsy and feels a bit clunky.

Enter the Sturmey Archer SLS30. This little work horse made from Aluminum with an engineered polymer thumb grip shifts reasuringly and smoothly every time. 

• Constructed from Aluminum with Stainless steel bolts with a polymer thumb grip
• 22.2mm Clamp
• Weight - 87g  
• Model Number HSJ962