Shimano BB-UN300 Bottom Bracket Sealed Bearing BB Kit
$ 34.95$ 0.00
Shimano BB-UN300 Square Spindle Bottom Brackets, perfect for the Speedline Square Taper Mini Cranks.
- Fits JIS square-taper cranksets
- Crankarm fixing bolts sold separately
- Hollow spindle
- Spindle Interface Type: Square Taper JIS
- BB Shell Width (mm): 68mm
- Bottom Bracket Shell I.D.: 1.37
Race calendar
Never miss a USABMX national
Add the 2026 USABMX national race schedule to your calendar with one click. Built by Supercross BMX so racers, parents, and fans can keep every national weekend in one place.
Dates are based on the official USABMX national schedule and may be updated if changes are announced. This calendar is a fan/racer convenience tool from Supercross BMX and is not an official USABMX calendar.