Specifications of the rear hub:
Brand: Sturmey Archer
Model: X-RD
Color: Silver
Number of spoke holes: 36GTS
Type of brake: Drum Brake 70 MM
Number of gears: Freewheel 5-7S
Type of axle: Fixed axle 180 MM
Axle included: Yes, without nuts
Type of bearings: Ball bearings
Average weight (GR): 833
Intended use: City

Data for spoke length calculations using the Sapim spoke size calculator:
Total length of the hub (MM): 135
Non-gear side (MM): 24
Gear side (MM): 47
Hub diameter non-gear side (MM): 89
Hub diameter gear side (MM): 89

Link to spoke calculator: www.sapim.be/spoke-calculator