The Shimano BB-UN300 is a square taper bottom bracket featuring sealed cartridge bearings and a Cr-Mo axle. It replaces both BB-UN26 and BB-UN55 models. For bicycles equipped with a chain case, select BB-UN300-K; for E-type front derailleur compatibility, choose BB-UN300-E. Fixing bolts are not included; Shimano FC-E6000 bolts are suggested.
The Shimano BB-UN300 is a square taper bottom bracket featuring sealed cartridge bearings and a Cr-Mo axle. It replaces both BB-UN26 and BB-UN55 models. For bicycles equipped with a chain case, select BB-UN300-K; for E-type front derailleur compatibility, choose BB-UN300-E. Fixing bolts are not included; Shimano FC-E6000 bolts are suggested.
There are no live offers for Shimano UN300 Square Taper English Bottom Bracket (Silver) (BSA) (68mm right now. The all-time low we recorded was $9.59 on 13 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 Bottom Bracket (Silver) (BSA) (68mm
The Shimano BB-UN300 is a square taper bottom bracket featuring sealed cartridge bearings and a Cr-Mo axle. It replaces both BB-UN26 and BB-UN55 models. For bicycles equipped with a chain case, select BB-UN300-K; for E-type front derailleur compatibility, choose BB-UN300-E. Fixing bolts are not included; Shimano FC-E6000 bolts are suggested.
The Shimano BB-UN300 is a square taper bottom bracket featuring sealed cartridge bearings and a Cr-Mo axle. It replaces both BB-UN26 and BB-UN55 models. For bicycles equipped with a chain case, select BB-UN300-K; for E-type front derailleur compatibility, choose BB-UN300-E. Fixing bolts are not included; Shimano FC-E6000 bolts are suggested.
Last updated at 21/03/2026 01:44:47
Shimano Bb-un300 Bottom Bracket - English, 68 X 122.5mm Spindle,
Delivery by Mar 31 $10.10
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Shimano BB-UN300 Square Taper JIS 68x122.5mm BSA Bottom Bracket 47.5mm Chainline
Delivery $8.99
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery by Apr 1 $33.73
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery between Mar 24 – 28 $8.50
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery between Mar 21 – 29 $14.99
Shimano BB-UN300 | Silver
Delivery between Mon - Tue $14.99
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery between Mar 23 – 31 $12
Shimano BB-UN300 English 68x122.5mm/47.5mm Bottom Bracket in Black/Silver
Delivery between Mar 26 – 31 $6
Shimano UN300 Square Taper Bottom Bracket Silver - Black 68 x 122.5mm
Free delivery between Mar 31 – Apr 1
Shimano BB-UN300 English 68x122.5mm/47.5mm Bottom Bracket in Black/Silver
Delivery between Mar 26 – Apr 1 $11.99
Shimano Bb-un300 Bottom Bracket - English, 68 X 122.5mm Spindle,
Delivery by Mar 31 $10.10
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 Square Taper JIS 68x122.5mm BSA Bottom Bracket 47.5mm Chainline
Delivery $8.99
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery by Apr 1 $33.73
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery between Mar 24 – 28 $8.50
Shimano BB-UN300 Bottom Bracket - English 68 x 122.5mm Spindle Square Taper JIS 47.5mm Chainline
Delivery between Mar 21 – 29 $14.99
