The only bottom bracket designed for the Patterson Transmission Crankset.
- —Die-cast then CNC machined alloy external non-drive side cup
- —Forged steel and CNC machined drive-side cup for better shifting mechanism support
- —Composite center sleeve w/ double o-ring seals
- —Finish: black cups
- — Sizes: English threading – 68 mm width (BC-1.37in x 24T)
- — Weight: 108g