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Shimano BB-UN300

Shimano BB-UN300
$23.99 - $24.99
Square Taper
Please select options
This product is not available for online purchase. Please call us for availability.


- 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 Store SKU
Silver / 115mm / English / Square Taper / 68mm 192790619187 EBBUN300B15B SHI51133370R
Silver / 122.5mm / English / Square Taper / 73mm 192790622194 EBBUN300C23X SHI55928772R
Silver / 122.5mm / English/BB-UN300-LL123 / Square Taper / 68mm 192790619255 EBBUN300B23X SHI55892155R