![Shimano Bb-un26 68mm X 117.5mm Sealed Square Hole Bottom Bracket With Crankscrews Es25 Un55 Un100 Bb 68/73 110/113/118mm - Bicycle Bottom Brackets - AliExpress Shimano Bb-un26 68mm X 117.5mm Sealed Square Hole Bottom Bracket With Crankscrews Es25 Un55 Un100 Bb 68/73 110/113/118mm - Bicycle Bottom Brackets - AliExpress](https://ae01.alicdn.com/kf/H874f1f18e55848c4bb4c83960ac29d9eN.jpg)
Shimano Bb-un26 68mm X 117.5mm Sealed Square Hole Bottom Bracket With Crankscrews Es25 Un55 Un100 Bb 68/73 110/113/118mm - Bicycle Bottom Brackets - AliExpress
![BB-UN55 square shell width 68mm (BSA) shaft length 118mm SHIMANO SHIMANO Genuine Parts / Part No. starting from: EB | MonotaRO Singapore BB-UN55 square shell width 68mm (BSA) shaft length 118mm SHIMANO SHIMANO Genuine Parts / Part No. starting from: EB | MonotaRO Singapore](https://jp.images-monotaro.com/Monotaro3/pi/full/mono24970225-180131-02.jpg)
BB-UN55 square shell width 68mm (BSA) shaft length 118mm SHIMANO SHIMANO Genuine Parts / Part No. starting from: EB | MonotaRO Singapore
![What is the difference between this Shimano BB-UN50 and the BB-UN55 ? The former is hard to find for sale, the latter seems to be found everywhere : r/bikewrench What is the difference between this Shimano BB-UN50 and the BB-UN55 ? The former is hard to find for sale, the latter seems to be found everywhere : r/bikewrench](https://preview.redd.it/0rebayvg94851.jpg?auto=webp&s=5cabea6a07e4c4b0e4ea6dbb792f11daeee464c0)