Specifications of the rear hub: 
Brand: BQ
Model: BQ-RH30016
Color: Black
Number of spoke holes: 32GTS
Type of brake: Disc (Centerlock)
Number of gears: HG Body 36.85 MM (HG 11) = suitable for all cassettes (possibly with the use of spacer(s))
Freewheel system:    Pawls (6)
Points of engagement:    60
Type of axle: Thru axle Ø 12 MM
Axle included: No
Type of bearings: Sealed bearings
Average weight (GR): 310
Intended use: Race / Gravel
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 142
Non-gear side (MM): 36
Gear side (MM): 51
Hub diameter non-gear side (MM): 58
Hub diameter gear side (MM): 58
 
Link to spoke calculator: www.sapim.be/spoke-calculator