Bottom Bracket – Cartridge
Old, but good - so you could describe a square axle. It is somewhat out of fashion, but many older bikes and especially children's bikes are still on the road with it. However, bottom brackets, just like most other moving bike parts, are wear parts. If your bottom bracket creaks, squeaks or cracks, you need a new one. Here you will find all possible square bottom bracket, and we tell you why they run round despite their four edges.
.