One side for single freewheel and one side for fixed gear.

Specifications of the rear hub:
Brand: Miche
Model: Primato Flip-Flop
Color: Silver
Number of spoke holes: 32GTS
Type of brake: Rim brake
Number of gears: 1S
Type of axle: Fixed axle 163 MM
Axle included: Yes, with nuts
Type of bearings: Ball bearings
Average weight (GR): 285
Intended use: Fixy - Singlespeed

Data for spoke length calculations using the Sapim spoke size calculator:
Total length of the hub (MM): 130 - 120 MM
Non-gear side (MM): 27
Gear side (MM): 27
Hub diameter non-gear side (MM): 60
Hub diameter gear side (MM): 60

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