Shimano BB-UN300 British Thread Bottom Bracket Made with Shimano’s usual exacting standards, the BB-UN300 Bottom Bracket is an excellent option for bikes that have British threaded bottom bracket shells and chainsets with a traditional square tapered spindle fitting. Made into a one-piece unit, this bottom bracket keeps dirt, mud and water away from the sealed bearings to offer durability, corrosion resistance and low friction operation. The threaded construction installs easily without the need for any fiddly adjustments, and the narrow body of this unit means that it won't hinder gear and brake cables that are being routed internally through the frame's bottom bracket shell.
Shimano BB-UN300 British Thread Bottom Bracket Made with Shimano’s usual exacting standards, the BB-UN300 Bottom Bracket is an excellent option for bikes that have British threaded bottom bracket shells and chainsets with a traditional square tapered spindle fitting. Made into a one-piece unit, this bottom bracket keeps dirt, mud and water away from the sealed bearings to offer durability, corrosion resistance and low friction operation. The threaded construction installs easily without the need for any fiddly adjustments, and the narrow body of this unit means that it won't hinder gear and brake cables that are being routed internally through the frame's bottom bracket shell.
in 74 offers
Shimano BB-UN300 British Thread Bottom Bracket Made with Shimano’s usual exacting standards, the BB-UN300 Bottom Bracket is an excellent option for bikes that have British threaded bottom bracket shells and chainsets with a traditional square tapered spindle fitting. Made into a one-piece unit, this bottom bracket keeps dirt, mud and water away from the sealed bearings to offer durability, corrosion resistance and low friction operation. The threaded construction installs easily without the need for any fiddly adjustments, and the narrow body of this unit means that it won't hinder gear and brake cables that are being routed internally through the frame's bottom bracket shell.
Shimano BB-UN300 British Thread Bottom Bracket Made with Shimano’s usual exacting standards, the BB-UN300 Bottom Bracket is an excellent option for bikes that have British threaded bottom bracket shells and chainsets with a traditional square tapered spindle fitting. Made into a one-piece unit, this bottom bracket keeps dirt, mud and water away from the sealed bearings to offer durability, corrosion resistance and low friction operation. The threaded construction installs easily without the need for any fiddly adjustments, and the narrow body of this unit means that it won't hinder gear and brake cables that are being routed internally through the frame's bottom bracket shell.
Size
Last updated at 06/11/2025 02:29:55
Shimano Square Type Bottom Bracket 68 x 122.5mm w-o Bolts - BB - UN300
Delivery between 8–18 Nov $12.94
Shimano BB-UN300 Bottom Bracket 68 x 107mm without Fixing Bolt
Delivery between 11–13 Nov $9.90
Shimano UN300 Square Taper Bottom Bracket 68 x 122.5mm
Delivery between 11–13 Nov $9.90
Shimano BB-UN300 BSA square bottom bracket Version 68 x 122.5 mm
Delivery between Fri – Mon $42.63
Shimano Bb-Un300 Bottom Bracket 73x122mm w/Fixing Bolt
Delivery between 6–13 Nov $9.99
Shimano BB-UN300 Taper MTB Bottom Bracket British Thread 68mm / 113mm
Free delivery
Shimano BB-UN300 Taper MTB Bottom Bracket British Thread 68mm / 110mm
Delivery $10
Shimano Bottom Bracket, BB-UN300, Square Taper, BSA Threaded - 68x107mm
Delivery between 11–17 Nov $10
See 28 historical offers
Shimano Euro BB Square Taper (115mm)
Delivery between Wed – Mon $10
Shimano BB-UN300 Bottom Bracket - English, 68 x 122.5mm Spindle [MPN: EBBUN300B22X]
Shimano BSA 127.5/68mm BB-UN300 Square Chaincase Bottom Bracket
Delivery $70.99
Shimano UN300 Bottom Bracket w/out Fixing Bolts 68x107mm
Delivery between Tue – Fri $9.90
SHIMANO Bottom Bracket BB-UN300 Square Type
Delivery between 30 Oct – 4 Nov $32.39
SHIMANO Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 127.5MM (D-EL) - EBBUN300B27B
Delivery between 28 Oct – 6 Nov $30.26
Shimano BB-UN300 Bottom Bracket | 68mm BSA Thread | 110mm Spindle | Sealed Cartridge
Delivery between Fri – Sat $15.08
Shimano Bb-UN300 Taper Mtb Bottom Bracket British Thread 68mm / 113mm 68mm Bottom Brackets
Free delivery
SHIMANO Bottom Bracket 68BSA EBBUN300B23X BB-UN300 122.5mm (LL123)
Free delivery
| Included Components | Transmissions |
Shimano BB-UN300 Vierkant-Innenlager // BSA 73x123 mm (Alivio)
Shimano Square Type Bottom Bracket 68 x 122.5mm w-o Bolts - BB - UN300
Delivery between 8–18 Nov $12.94
Shimano BB-UN300 Standard Bottom Bracket in Grey
Delivery $15
Shimano BB-UN300 Bottom Bracket 68 x 107mm without Fixing Bolt
Delivery between 11–13 Nov $9.90
Shimano UN300 Square Taper Bottom Bracket 68 x 122.5mm
Delivery between 11–13 Nov $9.90
See 28 historical offers
Shimano Euro BB Square Taper (115mm)
Delivery between Wed – Mon $10
Shimano BB-UN300 Bottom Bracket - English, 68 x 122.5mm Spindle [MPN: EBBUN300B22X]
Shimano BB-UN300 Bottom Bracket
Free delivery between 5–11 Nov
Shimano BSA 127.5/68mm BB-UN300 Square Chaincase Bottom Bracket
Delivery $70.99
BB-UN300 BOTTOM BRACKET 68X118MM W/O FIXING BOLTS
Delivery $14.95
Shimano UN300 Square Taper Bottom Bracket
Delivery $15
Shimano Bb-un300 Square Taper Bottom Bracket
Delivery $15
Shimano UN300 Bottom Bracket w/out Fixing Bolts 68x107mm
Delivery between Tue – Fri $9.90
Bottom Bracket Shimano BB-UN300 BSA 68mm 117.5mm/68mm
Delivery $30.22
Miniklio velenas Shimano BB-UN300 BSA 68mm 110 mm
SHIMANO Bottom Bracket BB-UN300 Square Type
Delivery between 30 Oct – 4 Nov $32.39
SHIMANO Square Type Bicycle Bottom Bracket - BSA 68MM, Spindle: 127.5MM (D-EL) - EBBUN300B27B
Delivery between 28 Oct – 6 Nov $30.26
Shimano BB-UN300 Bottom Bracket | 68mm BSA Thread | 110mm Spindle | Sealed Cartridge
Delivery between Fri – Sat $15.08
Square bottom bracket Shimano BB-UN300 68mm / 110mm
Delivery $53.71
Shimano Bb-UN300 Taper Mtb Bottom Bracket British Thread 68mm / 113mm 68mm Bottom Brackets
Free delivery
SHIMANO Bottom Bracket 68BSA EBBUN300B23X BB-UN300 122.5mm (LL123)
Free delivery
| Included Components | Transmissions |
