Speed B.B Cartridge 122.5MM
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122.5mm Cartridge Bottom Bracket (Square Taper)
A 122.5mm cartridge bottom bracket is a durable, low-maintenance solution for a wide range of bicycles, including mountain bikes, hybrids, and commuters. Featuring a sealed cartridge design and JIS square taper spindle, it delivers smooth, consistent performance while maintaining proper chainline alignment.
Popular models such as the Shimano BB-UN300 and Kenli KL-08A are widely trusted for their reliability and ease of installation.
⚙️ Key Features
-
Sealed cartridge unit
Protects against dirt and moisture for long-lasting performance -
JIS square taper interface
Compatible with a broad range of cranksets -
Optimized chainline (122.5mm spindle)
Ideal for MTB and hybrid drivetrains requiring slightly wider spacing -
BSA threaded compatibility
Fits most standard threaded frames
???? Technical Specifications
- Spindle length: 122.5 mm
- Shell width: 68 mm (also compatible with some 73 mm setups)
- Thread standard: BSA / English
- Interface: Square taper (JIS)
- Type: Sealed cartridge bearings
???? Ideal Use
- Mountain bikes (MTB)
- Hybrid and commuter bikes
- Replacement for worn or noisy bottom brackets
???? Bottom line
A 122.5mm square taper bottom bracket is a simple, dependable upgrade or replacement that ensures proper chain alignment and smooth pedaling. With proven options like the Shimano BB-UN300 or Kenli KL-08A, it’s an easy choice for riders who value durability and fuss-free maintenance.
