The SHIMANO ALFINE S7001-8 hub offers a wide gear ratio range of 307% and an improved internal structure for better gear engagement. It is approved for use with and without E-BIKE

Specifications of the rear hub: 
Brand: Shimano
Model: Alfine Inter 8 SG-S7001-8
Color: Black
Number of spoke holes: 36GTS
Type of brake: Disc (Centerlock)
Number of gears: 8S
Type of axle: Fixed axle 187 MM
Axle included: Yes, without nuts
Type of bearings: Ball bearings
Average weight (GR): 1665
Intended use: City
 
Data for spoke length calculations using the Sapim spoke size calculator: 
Total length of the hub (MM): 135
Non-gear side (MM): 34
Gear side (MM): 41
Hub diameter non-gear side (MM): 93
Hub diameter gear side (MM): 93
 
Link to spoke calculator: www.sapim.be/spoke-calculator