• The NT555R is a D.O.T.-compliant competition drag radial designed with additional flexibility for the weekend drag racer. The NT555R combines a high-grip compound and semi-racing construction to provide increased traction at the starting line. The tire comes molded at 6/32 of an inch and features a unique reinforced belt package to provide improved traction and high-speed stability. The NT555R is the performance radial for the street or strip.