The majority of commercial dealer sales in 2010 was in the medium truck (sizes 19.5-24.5) and commercial light truck tire segments, 33.1% and 28.9%, respectively.
Following behind those categories were heavy truck, at 11.7%, ag tires, at 8.8%, and specialty/industrial and OTR, at 6.9% and 6.6%, respectively
Data from Tire Review 2011 Tire Market Profile.