Please Find a True 225/45/17 Tire to Spec for C-Spec
#36085 from Mike Ogren · Not recommended · Minutes (2024-07 Fastrack)
Thank you for your letter. While C-Spec will likely have a spec tire at some point in the future, the committee will not
be specifying a tire for a regional class that has just begun its development.
While the Hoosier 225/45/17 is certainly wide for its stated size, there are examples of the first generation Mazda 3
racing in T4 with 245 Hoosiers at all four corners. Further, specifying the Toyo RR for the class would not be a wise
due to the fact that this tire is going to be phased out and replaced by Toyo at the end of this year.
Many of these vehicles came from the factory with optional 17-inch wheels. The reason that this diameter was
selected was because while some cars use a 4x100 bolt pattern, many of them utilize a 5x114 or similar bolt pattern.
Competition-grade 15-inch wheels are difficult to find in this bolt pattern, and 16-inch race tires are not commonly
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available. The committee was also informed that there was a Mazda 3 that recently ran at Palmer in C-Spec trim with
the specified tires and had no clearance issues.