Main Axle Nut
The main axle nut uses a Shimano BB tool interface, the one that’s been around for ages, the one that is in your toolbox. If you own a Madonna with the 44 mm hexagon nut, you can retrofit this one. Sorry we didn’t use this tool interface from the start.
- Shimano BB tool interface
- Fits Madonna V1 and Madonna V2 main axles