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Wingflex: The shell's side edges flex and adapt to a rider's inner leg movement
including reduced symptoms of
clog-inciting valve core of yesteryear
T-Type compatibility
Comfortable hood shape
Shimano BB-UN300 Square Taper Bottom Bracket 68mm Shell, 115mm (D-H) Spindle (w/ Fixing Bolt) ss24 Wingflex: The shell's side edgesThe Shimano BB UN300 is a highly reliable square taper bottom bracket designed to provide a smooth and durable interface for your crankset. As the successor to the popular BB UN26 and BB UN55 models, it offers a high quality sealed cartridge bearing system that keeps out dirt and moisture, ensuring long lasting performance with minimal maintenance. Featuring a strong Chrome moly (Cr Mo) axle, this bottom bracket is built to withstand the rigours of
