SHIMANO BB-UN300 bottom bracket British thread, 68-122.5 mm (LL123), silver, One Size, EBBUN300B23X

Replaced a bb badly rusted. No problem with this one, time will tell but looks solid and smooth. Make sure you measure the old one before ordering.

montado, y unos 300km cn él y 0 problemas, los retenes hace que no entre suciedad dentro.

This bottom bracket is for my e bike which I use pedal assist on extensively. As it's a legal 250W motor I have to put in a bit of personal oomph, especially on hills so the mechanics of the bike are very important. The bracket on the bike in comparison (Chinese bike) was a loud mess although it's rotation was adequate and would have lasted longer, however eyeing the corrosion evident on it, decided to replace the bracket and I'm so glad I did. The Shimano one is silent and very smooth with excellent build quality. I've been gradually replacing the original parts on the bike with more upmarket replacements as time goes on and it'll last for many years as a result. This bottom bracket is very good value for money and raises the bar quite a bit compared to the lousy original part. It didn't last for many years as hoped, just a little under two years. Bearings corroded on chainring side. Disintegrated with complete collapse on one side. Having said that, I've replaced with this item again. It did run well up until the failure point, it's reasonable price for two years of constant use won't break the bank.

Movimento centrale acquistato assieme a guarnitura Shimano FC-M311 48/38/28T 175mm Adatto unicamente per telai con scatola a filettatura inglese 68mm e passo 1.37x24, da verificare prima dell'acquisto

Lo utilice para cambiar el buje de una bicicleta Ghost Suárez y me funciona perfecto. Tiene buen aspecto y parecía mejor que el original. Habrá que ver la durabilidad.