Even though the times have changed and the standards have changed, there are always parts that are needed.
One of them is the square tapered bottom bracket, SHIMANO'sThe BB-UN55 is one of the widest, most popular and long-used square taper bottom brackets to date.
Please carefully check the size and standard you need before selecting.
Type: BSA, ITA
Shell width: 68 mm, 70 mm, 73 mm
Shaft length: 107 mm, 110 mm, 113 mm, 115 mm, 118 mm, 122.5 mm, 127.5 mm
Axis type: Square taper (JIS)
E type compatibility: None
Chain case compatibility: None