BB-UN55 BOTTOM BRACKET 68mmx127mm
BB-5500 BOTTOM BRACKET 68mmx118mm 105
This bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely. It contains a spindle to which the crankset attaches, and the bearings that allow the spindle and cranks to rotate. The chainrings and pedals attach to the cranks.
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