To use the hub for rim brakes, a cap can optionally be mounted over the roller brake connection. See related articles below.

Specifications of the rear hub: 
Brand: Shimano
Model: Nexus Inter 7 SG-C3001-7R
Color: Black
Number of spoke holes: 36GTS
Type of brake: Rollerbrake or Rim brake
Number of gears: 
Material of the freewheel body: 
Freewheel system: 
Points of engagement: 
Type of axle: Fixed axle 180 MM
Axle included: Yes, without nuts
Type of bearings: Ball bearings
Average weight (GR): 1487
Intended use: City
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 132
Non-gear side (MM): 32
Gear side (MM): 40
Hub diameter non-gear side (MM): 88
Hub diameter gear side (MM): 88
 
Link to spoke calculator: www.sapim.be/spoke-calculator