Square Cotterless BB
PT-6621A
BC1.37" * 24T frame
Width: 68mm
Bearings: Sealed cartridge bearings 31 * 10 (R403)
Material: Cold-forged & CNC machined AL6061 cups
Water seal AL6061 shell
10B21 CNC machined square taper axle
Finish: Anodized color available
PT-6621A Drawing download