Spec Tires: The Vega tire will be the spec tire for all Tri-C Karters race series and special event races. Please see the individual class listing below for the required spec Vega tire for each class.

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Rain Tires:  The 2026 Championship Trifecta season spec wet tire will be open to all brands. 

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Spec Fuel: Sunoco Supreme 112 or pump gas (see listing below).  See individual class listings for specified fuel.

Mixing of fuel brands or types is ILLEGAL and will result in a DQ.  Any additives, whether they are performance enhancing or not, are ILLEGAL and will result in a DQ (with the exception of manufacturer additives present in pump gas from the pump).

It is advised to purchase pump fuel the day of the race.  A test sample of both fuels will be taken that day and used by Post Tech for comparison.

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Legal pump gas can be purchased at these local stations only

for races at the respective tracks:

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High Desert Championship @ Willow Springs Raceway

Arco (AM/PM Market)​​​​​

2101 W, Rosamond Blvd

Rosamond, CA 93560