Specifications of the rear hub:
Brand: Union
Model: steel chrome
Color: Silver
Number of spoke holes: 36GTS
Type of brake: Rim brake
Number of gears: Freewheel 5-7S
Type of axle: Fixed axle 170 MM
Axle included: Yes, with nuts
Type of bearings: Ball bearings
Average weight (GR): 259
Intended use: MTB - Tour

Data for spoke length calculations using the Sapim spoke size calculator:
Total length of the hub (MM): 130
Non-gear side (MM): 30
Gear side (MM): 45
Hub diameter non-gear side (MM): 45
Hub diameter gear side (MM): 45

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