What is NHRA rules on tire tubes? Do they need to have metal valve stem or not? All I can find about valve stems pertain to TUBELESS tires, nothing about the use of tubes.


5:1
Tires will be visually checked for condition, pressure, etc. and
must be considered free of defects by the technical inspector
prior to any run. All street tires must have a minimum of 1/16-
inch tread depth. Temporary spares, space saver spares, farm
implement or trailer tires prohibited. Metal, screw-in valve stems mandatory in tubeless tires, front and rear, on vehicles running 11.99 or quicker; unless OEM tire pressure monitor sensor is used. Chemically treating and physically altering (e.g. lightening, etc.) a tire in any manner is prohibited unless such treatment or alteration is performed by the original manufacturer.