Specifications of the front hub:

https://www.sturmey-archer.com/en/products/detail/x-fd

 

Brand: Sturmey Archer

Model: X-FD

Color: Silver

Number of spoke holes: 36

Type of brake: Drum Brake 70 MM

Type of axle: Fixed axle

Axle included: Yes, with nuts

Weight (GR): 770

Intended use: City


Data for spoke length calculations using the Sapim spoke size calculator:

Total length of the hub (MM): 100

Non-gear side (MM): 21

drum brake side (MM): 21

Hub diameter non-gear side (MM): 89

Hub diameter drum brake side (MM): 89

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