Specifications of the front hub:
Brand: Sturmey Archer
Model: HBT30-F
Color: Silver (Polished)
Number of spoke holes: 36
Type of brake: Rim brake
Type of axle: Fixed axle 145 MM
Axle included: Yes, with nuts
Type of bearings: Industrial bearings
Weight (GR): 237
Intended use: Fixy - Singlespeed

Data for spoke length calculations using the Sapim spoke size calculator:
Total length of the hub (MM): 100
Non-gear side (MM): 15
Gear side (MM): 15
Hub diameter non-gear side (MM): 61
Hub diameter gear side (MM): 61

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

  http://www.sturmey-archer.com/en/products/detail/hbt30-f-silver