2019 IHRA Rulebook

IHRA 49 Metal screw-in valve stems mandatory in tubeless tires front and rear of all entries running 11.99 and quicker 1/4 mile or 7.49 and quicker 1/8 mile. All cars running in altered cars, and all Dragster Divisions must use an approved racing tire on front as well as rear of car. WINDOW NET: If class mandates a roll cage the entry must have an SFI 27.1 safety net properly attached. Net must be secured on inside of roll cage at the bottom. The bottom can be attached with a 7/16” rod through the net, hose clamped to cage. The top may be clipped to eye bolts installed to roll bar. Net must fasten at the top and be permanently mounted to bottom. Net must extend forward to within two inches of the farthest back portion of the steering wheel. WINDSHIELD/WINDOWS: A windscreen is required in place of windshield on open bodied cars. Minimum size of windscreen: 5” x 12”. Window openings in all coupes and sedans must maintain a 5” minimum height, measured vertically. Full bodied cars must have windshield. WINDSCREENS: On open-bodied cars, or any other class car permitted to enter competition without a windshield, a metal, or other fireproof deflector must be installed. Minimum size on Street Roadster & Altered class cars is 5” x 12”. The deflector should be so constructed that it will divert wind, liquids, foreign matter, etc., over the driver’s head, be securely mounted, and installed in such a manner that it does not in any way obstruct the driver’s frontal view. WINDSHIELD & WINDOWS: Windshields, and/or windows on all competition vehicles, when listed under Class Requirements, must be OEM or of IHRA approved material. Figure 15: Wheel mounting