Tire Policies and Procedures


Just so we are all on the same page

  As stated on the rules page, we follow UMA’s rules as much as we can. Just because we are running a different tire, does not mean all the UMA rules on tires are tossed out the window as well.

UMA strictly prohibits any altering of tires physically and/or Chemical treatment of tires (softening) not permitted. UMA Officials may impound tires to check for altering and/or chemical treatment of tires. Drivers and in some cases, Owners and Crew Members, will be severely penalized if they are suspected of altering and/or Chemical treatment of tires.


No Tire Impound

CWRA has no mandatory tire impound. Racers can unload their car with the tires they plan on racing with. CWRA believes that its participants will appreciate this gesture of trust, and in return, not attempt to exploit this entrusted flexibility.

CWRA’s Tire Tech Process

Establishing the Dynamic Durometer Number (Cold)

CWRA primarily uses a dynamic durometer number, to keep an eye on its tires. The softness number is established at the first race, from tires that have not been driven on. New tires are checked for their softness, and CWRA establishes an average reading from tires that were tested. the softest 5 tires will also be checked and pulled from being purchased if they fall out of a 5 point acceptance range of the average.

  The Softest tire for sale will be used as the starting baseline for the year. There will be -1 point allowance on the baseline to accommodate for variance in the checking process. This will be the number that CWRA expects its used tires to durometer above when they are cold


CWRA’s Procedure for Soft Tire “Anomalies”

CWRA understands that Durometer numbers can vary throughout the racing season, and since CWRA does not impound tires, has to consider storage conditions as a factor in the Durometer numbers. This is why the Durometer number is “Dynamic” and not a “Hard Set” number. “Used Tires” are expected to Durometer higher than the Durometer number that was established on the “New Tires”.

Dealing With Really Soft Tire.

  When or If a “Used Tire or Tires” is found to be significantly lower than the Established Durometer Number, We ask the team or driver to replace the tire with either a new tire, or a used tire that is not below the Established Durometer Number.

CWRA Tech officials will document the Serial Number of the tire, and will follow up with the team after the features to verify that the tire was not used that night.

    The tire or tires in question are not confiscated from the team or driver, so they could potentially hotlap the tires during a private practice session, or during a different event.  Once the tires durometer above the Established Durometer Number, they can be used at a CWRA event.

Dealing With Slightly Soft Tires

  When or If a “Used Tire or Tires” is found to be slightly lower than the Established Durometer Number, it challenges the Dynamic Durometer rule. This does not imply that the team or driver is cheating, it implies that the durometer number is too high and may need to be changed.

  The team or driver is allowed (if they choose) to race the tire, but will be required to report to the scales after qualifying and main events, regardless of finishing order (unless they wreck to the point that its not important anymore).

CWRA Tech officials will document the Serial Number of the tire, and paint the Hoosier label on the side of the tire white.

  CWRA Tech officials will report that the Durometer number has been challenged by {Count Of} tires between {Distinct Count Of} Teams in the drivers meeting

These tires are allowed 1 event under the Established Durometer Number. Anymore than that and we ask the team or driver to replace the tire with either a new tire, or a used tire that is not below the Established Durometer Number.

When does the Established Durometer Number Change?

When the number of tires from completely different teams or drivers are being found to be under the existing Durometer Number is significant enough to justify it.