Transmaster 4.80-12 6 Ply Tire and 12" 4 Lug White Spoke Wheel Transmaster 4.80-12 6ply tire and wheel combination. 4 lug white wheel with high pressure valve stem. Load capacity 990 lbs. @ 90 psi. O.D. 20.6" S.W. 4.7" Always follow trailer manufacturers placarded PSI limitations prior to use.