Threadless Cartridge BB
A great solution for repairs on bicycles with square-taper cranksets where the bicycle frame has damaged or stripped threads in the bottom bracket.
The patented design YST BB-993 threadless cartridge unit threads to itself and has bevelled cups for a snug fit.
Durable Steel cups, body and axle with sealed bearings.
Compatible with 68mm English type BB frames.
Use ‘UN’ type BB spline tool for fitting. e.g. Ison part number: 2FX27
Torque for tightening the bottom bracket is 400kgf-cm to 500kgf-cm (40-50Nm)
Most lengths of square taper axles are available.
Technical InformationYST Threadless Cartridge BB Instructions
Instructions for YST BB993 Threadless Bottom Bracket
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