This information is for if you want to build a wheel and want to figure out what length spokes you need for that particular rim, using a spoke calculator.
Hub flange diameter 300mm
Paired Hole spacing 21mm
Flange width 21mm
You can plug this into any spoke calculator along with the ERD of the rim to figure out what length spokes you need
Hub flange diameter 300mm
Paired Hole spacing 21mm
Flange width 21mm
You can plug this into any spoke calculator along with the ERD of the rim to figure out what length spokes you need