Specifications of the front hub: 
Brand: Sunrace
Model: HBM93
Color: Black
Number of spoke holes: 32GTS
Type of brake: Disc (6 bolts)
Type of axle: Drop axle
Axle included: Yes, quick release
Type of bearings: Ball bearings
Average weight (GR): 238
Intended use: MTB - Tour
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 100
Non-gear side (MM): 26
Gear side (MM): 15
Hub diameter non-gear side (MM): 57
Hub diameter gear side (MM): 57
 
Link to spoke calculator: www.sapim.be/spoke-calculator