Shimano BB-UN300 Bottom Bracket - English, 73 x 123mm Spindle, Square Taper JIS Apparel Brand_45NRTH ESSENTIAL STORAGEEasily accessible rear envelope

ESSENTIAL STORAGEEasily accessible rear envelope pockets provide adequate secure storage for your race-day essentials

Compatibly - 1-1/8" Steerer tube Diameter

Six Bolt or Centerlock rotor mount

especially when you’re planning on riding a fast and familiar route

it is perfect for domestic and international flights

Shimano BB-UN300 Bottom Bracket - English, 73 x 123mm Spindle, Square Taper JIS Apparel Brand_45NRTH ESSENTIAL STORAGEEasily accessible rear envelopeShimano BB UN300 Square Spindle Bottom Brackets Fits JIS square taper cranksets Crankarm fixing bolts sold separately Hollow spindle Spindle Interface Type: Square Taper JIS BB Shell Width (mm): 73 Bottom Bracket Shell I. D.: 1. 37 Spindle Length: 123 Defined Color: Black BB Frame Interface: English