SHIMANO BB-UN300-E E-Type Bottom Bracket - 68 x 122.5mm - BSA - Square Taper Compatio_Enriched The welded construction of the

The welded construction of the XR 391 and the bead blasted

antibacterial

The new shape of the end caps facilitates disassembly and thus speeds up handling requiring disassembly

Tubelss 2PLY Casing

Weather-resistant softshell fabric on the outside defends against wind and water

SHIMANO BB-UN300-E E-Type Bottom Bracket - 68 x 122.5mm - BSA - Square Taper Compatio_Enriched The welded construction of theSHIMANO Square Type Bottom Bracket MTB Standard Structure Square Type Bottom Bracket SHIMANO quality performance cartridge bearing square bottom bracket Better chainline stability with chain line stabilizer 3 structures available Standard, E type, chain case options Adapter material: Aluminum