Specifications of the front hub: 
Brand: BQ
Model: BQ-FH30515
Color: Black
Number of spoke holes: 28GTS
Type of brake: Disc (Centerlock)
Type of axle: Thru axle Ø 15 MM
Axle included: No
Type of bearings: Sealed bearings
Average weight (GR): 132
Intended use: MTB
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 110
Non-gear side (MM): 24
Gear side (MM): 14
Hub diameter non-gear side (MM): 46
Hub diameter gear side (MM): 46
 
Link to spoke calculator: www.sapim.be/spoke-calculator