Rim Specifications:
Brand: Rigida - Ryde
Model: DP18 Speed Disc
Color: Zwart
Size (Inch/MM): 28" / 622
External width (MM): 23
Internal width (MM): 18
Weight (GR): 618
Material: Aluminium
Single-walled / Double-walled: Double-walled
Single eyelets / Double eyelets: No Eyelets
Number of spoke holes: 24
Spoke nipple size: 14
Brake surface present: No

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

Internal diameter of the rim (MM *Not ERD*): 563

Rim thickness (MM): 2

Number of spokes in the wheel: 24

Number of crossings gear side: of your choice

Number of crossing non-gear side: of your choice

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