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Attention Wheel Away Customers: Please note that Wheel Away does not service E-Bikes that are not Specialized brand.

Shimano BB-UN300

Shimano BB-UN300
Square Taper
Please select options
Please note: Due to Covid-19 and higher than normal demand, not all in-store inventory may be current. Please call for confirmation on your order. Also, please allow for a few extra days for items ordered from warehouses. Thank you for your understanding.


- Simple and reliable square taper bottom bracket
- Replaces both BB-UN26 and BB-UN55
- Sealed cartridge bearings
- Cr-Mo axle
- For bicycles equipped with a chain case, select BB-UN300-K
- For E-type front derailleur compatibility, choose BB-UN300-E
- Fixing bolts not included; Shimano FC-E6000 bolts suggested

Part Numbers

Option UPC MPN
Silver / 110mm / English / Square Taper / 68mm 192790619200 EBBUN300B10X
Silver / 115mm / English / Square Taper / 68mm 192790619187 EBBUN300B15B
Silver / 117.5mm / English / Square Taper / 68mm 192790619224 EBBUN300B17X
Silver / 118mm / English / Square Taper / 68mm 192790619231 EBBUN300B18X
Silver / 122.5mm / English / Square Taper / 73mm 192790622194 EBBUN300C23X
Silver / 127.5mm / English / Square Taper / 68mm 192790619316 EBBUN300B27B
Silver / 122.5mm / English/BB-UN300 D-NL / Square Taper / 68mm 192790619156 EBBUN300B22X