It has a spindle length of 122.5mm and a BB shell width of 73mm, making it compatible with a wide range of bikes. The bottom bracket shell has an English interface and an inner diameter of 1.37 inches. The square taper JIS spindle interface ensures a secure and reliable connection between the crankset and the bottom bracket. Please note that crankarm fixing bolts are sold separately. The hollow spindle design helps reduce weight without compromising strength and durability.
It has a spindle length of 122.5mm and a BB shell width of 73mm, making it compatible with a wide range of bikes. The bottom bracket shell has an English interface and an inner diameter of 1.37 inches. The square taper JIS spindle interface ensures a secure and reliable connection between the crankset and the bottom bracket. Please note that crankarm fixing bolts are sold separately. The hollow spindle design helps reduce weight without compromising strength and durability.
There are no live offers for Shimano UN300 Square Taper English MTB Bottom Bracket (Silver) (BSA) ( right now. The all-time low we recorded was $9.90 on 19 Mar 2026. Set a price alert to hear when it's back in stock.
Prices last updated 21 Mar 2026.
Shimano UN300 Square Taper English MTB Bottom Bracket (Silver) (BSA) (
It has a spindle length of 122.5mm and a BB shell width of 73mm, making it compatible with a wide range of bikes. The bottom bracket shell has an English interface and an inner diameter of 1.37 inches. The square taper JIS spindle interface ensures a secure and reliable connection between the crankset and the bottom bracket. Please note that crankarm fixing bolts are sold separately. The hollow spindle design helps reduce weight without compromising strength and durability.
It has a spindle length of 122.5mm and a BB shell width of 73mm, making it compatible with a wide range of bikes. The bottom bracket shell has an English interface and an inner diameter of 1.37 inches. The square taper JIS spindle interface ensures a secure and reliable connection between the crankset and the bottom bracket. Please note that crankarm fixing bolts are sold separately. The hollow spindle design helps reduce weight without compromising strength and durability.
Last updated at 21/03/2026 01:49:34
Shimano Bb-un300 Bottom Black Bsa 73mm, Spindle: 122.5mm (ll123) -open
Delivery by Mar 27 $9.99
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 | Silver
Delivery between Mon - Tue $14.99
Shimano BB-UN300 Square Taper JIS 73x123mm Spindles BSA (English) Bottom Bracket
Delivery $8.99
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 21 – 28 $12.99
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 24 – 27 $5
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 24 – 28 $8.50
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 21 – 29 $14.99
BB-UN300 - 73mm / Square Taper
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 23 – 31 $12
Shimano BB-UN300 Bottom Bracket for MTB Cranksets in Black
Delivery between Mar 26 – 31 $6
Shimano Bb-un300 Bottom Black Bsa 73mm, Spindle: 122.5mm (ll123) -open
Delivery by Mar 27 $9.99
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 | Silver
Delivery between Mon - Tue $14.99
Shimano BB-UN300 Square Taper JIS 73x123mm Spindles BSA (English) Bottom Bracket
Delivery $8.99
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 21 – 28 $12.99
Shimano BB-UN300 Bottom Bracket - English 73 x 123mm Spindle Square Taper JIS
Delivery between Mar 24 – 27 $5
