Spec Miata - Class Rules

Class Rules

This section is not an exhaustive set of rules; it is intended to give the reader an idea of the preparation level of the cars in this class.

Spec Miatas use a specific Bilstein shock with an adjustable coil-over suspension with Eibach springs and adjustable front and rear sway bars, steel braided brake lines.

Depending on the region, Toyo, Kumho, or Hankook tires are specified. For National competition, the Toyo RA-1 (205/50R15) is the spec tire. Toyo RA-1 is now required in SCCA as of January 1, 2010 though the R-888 may be used until supplies are exhausted. In 2012 Hoosier Tires will provide the spec tire for all National Events. The wheel size is fixed at 15x7, with the wheels weighing no less than 13 pounds.

Cars with 1.6 liter engines have a race weight of 2300 pounds (1057 kg) and first generation cars with a 1.8 liter displacement engine have a minimum race weight of 2350 pounds. "Second generation Miatas" (1999-05) have a minimum weight of 2400 pounds. (These rules as of January 1, 2012)

The 1.8 liter displacement cars may not run an aftermarket air intake and must run a throttle restrictor, while the 1.6 liter displacement cars do not require a restrictor and may run a modified air box. The full rules for the class may be found in the current Spec Miata Category Specifications of the SCCA rule book, called the GCR (General Competition Rules & Specifications).