Rim Specifications:    
Brand:    Others
Model:    V38
Color:    White
Size (Inch/MM):    635X25C
External width (MM):    38
Internal width (MM):    25
Average weight (GR):    1113
Material:    Staal
Single-walled / Double-walled:    Single-walled
Single eyelets / Double eyelets:    No eyelets
Number of spoke holes:    36GTS
Spoke nipple size:    13G
Brake surface present:    No
    
Data for spoke length calculations using the Sapim spoke size calculator:    
Internal diameter of the rim (MM *Not ERD*):    618
Rim thickness (MM):    2
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