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

Specifications of the front hub:
Brand: Sturmey Archer
Model: HBT30
Color: Black
Number of spoke holes: 32GTS
Type of brake: Rim brake
Type of axle: Fixed axle 145 MM
Axle included: Yes, with nuts
Type of bearings: Industrial bearings
Average weight (GR): 235
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