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 2025 Chill Challenge spec wet tire will be open to all brands. 

Starting with the 2026 race season the Vega W6 wet tire will be the only spec rain tire.

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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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Chill Challenge at Adams Motorsports Park

Arco (AM/PM Market)

2985 Rubidoux Blvd.

Riverside, CA 92509​​​​​