GT Radial USA is supporting  North East, SoCal and NorCal 86CUP in 2018 with a Tire Contingency Program as well as cash Championship Prizes for drivers competing with GT Radial Champiro SX2 (220 UTQG) or Champiro HPY (UTQG 300):

See GT Radial 86CUP contingency programs in 2018.

If you run in other series, check out SCCA and NASA GT Radial USA contingency programs

GT RADIAL CUP CHALLENGE REGISTRATION FORM AND TIRE REQUEST FORM