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Ships within 48 hours · Estimated delivery Sep 10 - Sep 15
or out on the Sunday morning club ride
Zinc-Alloy plated outer plate
50mm ISO compliant towballs only
3 kg Fits frame dimensions All sizes down to 20” junior bikes
Weight 85g
Shimano BB-UN55 Bottom Bracket Brand_Castelli or out on the SundayShimanos BB UN55 bottom bracket carries the Shimano mark of a quality component. Its a sealed cartridge unit featuring English thread and a JIS Square Taper axle. For convenience, the BB UN55 comes assembled and greased, all ready for installation. SPECIFICATIONS Weight 313 gram Thread English thread Compatibility JIS Square Taper (shimano, sugino, truvativ, and most other cranks)