Shimano "BB-UN300" BMX Race Bottom Bracket - Square Taper
- Weight : 0.29kg / 0.64lbs
- Packaging Unit: 1 Set
- Product ID (PID): 45883
- Product safety
Weight
The heaviness of a BMX part, measured by weighing. It's worth noting that weight specifications for BMX parts can vary and may not always be precise. Several factors contribute to this:Manufacturer's weight specifications may be inaccurate or incomplete.The weight of two identical parts can also differ.We cannot weigh every individual part.For example, if there are handlebars in different heights, the manufacturer usually provides just one weight specification for all heights. When weighing two identical tires, you might get two different results.
Source: BMX Glossary
Found an error? Report it. 5 EUR voucher if confirmed.
Online: https://www.kunstform.org/en/shimano-bb-un300-bmx-race-bottom-bracket-square-taper-p-45883
Printed: 10/29/2026
Printed: 10/29/2026
The Shimano "BB-UN300" BMX Race Bottom Bracket - Square Taper is a cartridge bottom bracket for frames with a Euro BSA/BSC thread and a 68mm shell. The steel axle has a JIS square taper and fits square taper cranks of the same standard, the sealed bearings run smoothly and keep dirt out. US Pro recommends it mainly for young riders with square taper cranks. Axle bolts are not included.
Facts: Shimano "BB-UN300" BMX Race Bottom Bracket - Square Taper
- Style: BSA (Euro, cartridge)
- Thread: BSA/BSC
- Shell Width: 68mm
- Outside diameter: 34.5mm
- Axle Diameter: Square taper (JIS)
- Axle Length: 113mm or 118mm
- Bearings: 2 x sealed bearings
- Material: steel axle
- Content: 1 cartridge bottom bracket, without axle bolts
- Extras: only for JIS square taper cranks
These details come from manufacturer and supplier data. Found an error? Report it, there is a 5 EUR voucher for every confirmed error.
