Movimento centrale SHIMANO BB-UN55 perno quadro - Biciclette In vendita a Milano
Shimano BB-UN300 Movimento Perno Quadro BSA 68mm
SHIMANO BB-UN55, Movimento Centrale, Argento, 70-107 mm : Amazon.it: Sport e tempo libero
Shimano movimento centrale BB-UN300 118mm - Bikeservice
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