Bob, Drop rims are needed when mounting tubeless tires, because of the wire ring in the bead. Without the drop, you'd never get the tire mounted on the rim. I doubt that you'd easily find rims without the drop nowadays. Roger Hightower, N7KT WBCCI 4165, VAC, TCT 1975 31' Sovereign, '02 F-250 PSD Mesa, AZ mailto:n7kt@att.net