I found this information for the 1966 Chevrolet C10-C30 trucks. It probably is the same for the 1965 models as well.

All solid color and the Black/Off-White 2-tone combinations have black rims. All other 2-tones have rims painted the main body color.

Doug 57
1966 Chevrolet Suburban
"Bilko
All original
In the DITY Gallery
In the Gallery Forum
1966 Chevrolet C-10 LWB Fleetside
1966 Chevrolet C-30 Stepside Pick-up