I just checked their web site inflation chart and the D rated tire has the same load capacity at 50 lbs. as the C rated tire (2150 lbs.). It would seem that with that in mind the D rated tire at 50 lbs., would put no greater stress on the wheel than the C rated equivalent size. Jack Canavera STL. Mo. '04 Classic S.O. 30' WBCCI 5024