Single replacement shifting buttons for Schlumpf geared unicycle hubs.
The genuine article from Schlumpf Innovations in Switzerland. Available in two types - buttons to fit the original square taper Schlumpf hub (FSU hub) and buttons to fit the ISIS Schlumpf hub (KH-Schlumpf hub).
FSU hub buttons take a 1.5mm allen key while older KH-Schlumpf hub buttons take a 2.5mm allen key. Newer (2009 onwards, serial numbers greater than M0200) KH-Schlumpf hub buttons take a 2mm allen key.
Buttons sold individually.