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Shimano BB-UN300 MTB bottom bracket, square taper, 122.5mm
Voir les avis clients(2 reviews)
Square taper, 122.5mm length
Notre avis
Need to replace your Shimano bottom bracket? This model is suitable for a generation of cranksets with a square axle. The length of this model is 122.5 mm.
Sylvain C.
Mechanical expert
A bottom bracket ensures power transfer and a smooth pedalling action. This BB-UN300 version is often found on mountain bikes with a square-axle crankset. The length of this model is 122.5mm with a bottom bracket shell width of 68mm. The threading is BSA 1.37x24.
Technical specifications
- BSA 1.37x24 compatible- Axle length: 122.5mm
- Axle type: square taper
- Shimano part number EBBUN300B22X
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Juan D. 
Published May 18, 2026 at 04:07 pm (Order date: Apr 27, 2026)Super well packaged (Translated review)
- Philippe C.
Published Mar 11, 2022 at 12:57 pmas a replacement for the casing of my Rockrider ST 530..the original part did not last 2 rides. Despite being 2 mm wider, this casing fits perfectly. (Translated review)
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