The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55. It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. In this type, the bottom bracket axle and crank are connected by a square taper. Does not include crank bolts. About ShimanoEstablished in Japan in 1921, Shimano is the worlds largest bicycle component manufacturer. Whether it be drive systems, brakes, pedals or shoes, Shimano stands for reliable quality and performance. From Road & Gravel to Mountain, Touring & Urban use, Mechanical or Electric.
The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55. It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. In this type, the bottom bracket axle and crank are connected by a square taper. Does not include crank bolts. About ShimanoEstablished in Japan in 1921, Shimano is the worlds largest bicycle component manufacturer. Whether it be drive systems, brakes, pedals or shoes, Shimano stands for reliable quality and performance. From Road & Gravel to Mountain, Touring & Urban use, Mechanical or Electric.
The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55. It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. In this type, the bottom bracket axle and crank are connected by a square taper. Does not include crank bolts. About ShimanoEstablished in Japan in 1921, Shimano is the worlds largest bicycle component manufacturer. Whether it be drive systems, brakes, pedals or shoes, Shimano stands for reliable quality and performance. From Road & Gravel to Mountain, Touring & Urban use, Mechanical or Electric.
The BB-UN300 square taper bottom bracket was launched by Shimano as successor of the models BB-UN26 and BB-UN55. It covers a wide range of applications, from Touring and City bikes to older Road and Mountain bikes. BB-UN300 is available with BSA thread and in different axle lengths. In this type, the bottom bracket axle and crank are connected by a square taper. Does not include crank bolts. About ShimanoEstablished in Japan in 1921, Shimano is the worlds largest bicycle component manufacturer. Whether it be drive systems, brakes, pedals or shoes, Shimano stands for reliable quality and performance. From Road & Gravel to Mountain, Touring & Urban use, Mechanical or Electric.
Last updated at 06/23/2026 10:54:29
SHIMANO BB-UN300 Square Bottom Bracket // BSA 68 x 115 mm (Alivio)
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Shimano BB-UN300 Bottom Bracket 68x115mm DH w/ Fixing Bolts
Delivery $9.90
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Shimano BB-UN300 Bottom Bracket 68x115mm D-H w/ Fixing Bolts
Delivery between 25–30 June $9.90
Shimano BB-UN300 Bottom Bracket 68x115mm D-H W/ Fixing Bolts
Delivery between Thu – Mon $9.99
Shimano BB-UN300 Bottom Bracket DH w/Fixbolts 68x115mm
Delivery between 29 June – 1 July $9.90
Shimano UN300 Square Taper Bottom Bracket
Delivery $15
Shimano BB-UN300 Bottom Bracket — Square Taper / BSA / 68 x 115mm D-H
Delivery between 26 June – 6 July $8
BB-UN300 bottom bracket assorted sizes W/O fixing bolts 68x115mm
Delivery $16.95
Shimano BB-UN300 Bottom Bracket - 68 x 115mm
Delivery between 27 June – 2 July $9.50
Shimano BB-UN300 British Thread Bottom Bracket
Delivery between 29 June – 3 July $28.54
SHIMANO BB-UN300 Square Bottom Bracket // BSA 68 x 115 mm (Alivio)
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Shimano BB-UN300 Bottom Bracket 68x115mm DH w/ Fixing Bolts
Delivery $9.90
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Shimano BB-UN300 Bottom Bracket 68x115mm D-H w/ Fixing Bolts
Delivery between 25–30 June $9.90
Shimano BB-UN300 Bottom Bracket 68x115mm D-H W/ Fixing Bolts
Delivery between Thu – Mon $9.99
Shimano BB-UN300 Bottom Bracket DH w/Fixbolts 68x115mm
Delivery between 29 June – 1 July $9.90
