Shimano BB-UN300 Bottom Bracket 68x110mm w/o Fixing Bolts (Square Taper) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button... Shimano BB-UN300 Bottom Bracket 68x110mm w/o Fixing Bolts (Square Taper) Ships within Australia In stock. Available via Click and Collect or Buy Online Share Loading Facebook Like button...