Sumart bottom bracket BSA frame BB330 cranks

Sumart bottom bracket to use BB386 cranks with BB30 axle in threaded BSA frames. Due to the increased with is posible that you need to reduce spacers or buy a wider BB30 axle. This can affect to the chain line.

With sealed bearings to run smoother and last longer. They are suited to people who ride often in all conditions.

NOTE: Each lateral bearing adds 10mm of width, so at least add 20mm to your frame width to calculate the needed spindle width.