Rim Specifications:
Brand: Rigida - Ryde
Model: Big Bull
Color: Silver
Size (Inch/MM): 26" / 559
External width (MM): 31
Internal width (MM): 25
Weight (GR): 702
Material: Aluminium
Single-walled / Double-walled: Double-walled
Single eyelets / Double eyelets: Double eyelets
Number of spoke holes: 36
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*): 528

Rim thickness (MM): 3

Number of spokes in the wheel: 36

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