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have smaller frames
with channels on the top and bottom
39/53 Primary Color Grey
*Not applicable to France
Shimano Chaincase BB-UN300-K Square Taper Bottom Bracket Horst Engineering have smaller framesThe Shimano BB UN300 K is a square taper JIS bottom bracket specifically designed for use with a chaincase. This reliable component ensures smooth rotation and a stable drivetrain interface for MTB configurations. Precision Fitment: This 68x122. 5mm MTB Double option includes a 0. 7mm spacer to ensure proper alignment and clearance within the bottom bracket shell. Chaincase Compatibility: Specifically engineered as a "K" type model, making it the
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