Problem Solvers Single Speed Cog Carrier.
FW9907 / FW9908
Singlespeed Adapter incl. pinion for Shimano and compatible cassette hubs
to conversion to Single Speed
adapter made of aluminum, anodized
pinion made of Cr-Mo
width of Adapers incl. pinion 12mm
The Problem Solvers pinion can be screwed onto the 6x disc recording of a disc brake without adapter as fixed-gear pinion