The following is an overview of the basic categories that are currently run in the AFM Championship Series. There are "General Requirements of All Motorcycles" which all bikes must meet, as well as specific requirements for different classes. Detailed information on all classes is in the AFM Rulebook. (refer to Rule Section 6.1 CLASSES)
Production (refer to Rule Section 9.1)
These motorcycles are street based models that are designed for the United States market and can be purchased through a dealership. Limited edition motorcycles intended for racing purposes are generally not allowed in Production classes. There are very limited modifications allowed to the engine and suspension. Street legal, DOT approved tires must also be used.
The Production classes are further broken down by engine size, conforming to the typical sizes offered by manufacturers; Displacement categories are:
- 600-650cc Twins, 399-450cc 4-cylinders
- 751-Open cc.
Superbike(refer to Rule Section 9.2)
These motorcycles are also street based models, but may be made for any market in the world. Limited edition models designed for racing purposes may not be allowed. "Racing Only" slick tires may be used. Unlimited modifications to the engine and suspension are allowed based on following engine displacement classes:
- 751-Open cc
- Super Dinosaur - No displacement limits; bikes must be at least 12 model years old.
Formula(refer to Rule Section 9.3)
The motorcycles in these classes can be models based on street machines, factory purpose built racing models, or customer built one-of-a-kind motorcycles. Refer to the rulebook for class specifics and formulas. Modifications are unlimited within the various classes provided they meet the engine size/type formula for the class.
- Formula AFemme is a class for female racers only. This class is a chapter optional class and is offered when the race schedule permits.
- Formula I is a class for four-stroke multi cylinder engines from 451cc to 750cc, two stroke engines from 251cc to 500cc, 450cc or larger displacement four stroke single engines, and twin cylinder engines from 651cc to 1000cc.
- Formula II is a class where the true factory built, racing-only motorcycles rule. They are almost exclusively 250cc two-strokes with water-cooled engines. Large four-stroke singles are also allowed.
- Formula III also features mostly factory built race bikes, but these are 125cc two-strokes with water cooled engines. Smaller four-stroke singles can run here.
- Formula IV allows a wide variety of bike types. Various four-cylinders, mid-size twins, singles, and two-strokes all compete against each other.
- Formula Singles are four-stroke, single cylinder engines of unlimited size surrounded by any frame, suspension, etc. the builder wants to use.
- Formula Twins are four-stroke, twin cylinder engines broken down into three categories (245-500cc, 501-650cc, 651-Open cc) surrounded by any frame, suspension, etc.
- Formula 40 Can be any machine as long as its rider is 40 years of age or older. It is separated into 3 classes, Light, Middle and Heavy Weight. The classes are based on engine displacement and type of motorcycle.(see the race day schedule or the latest news/updates page for updates).
- Formula Vintage are motorcycles meeting the AHRMA Vintage rules and AFM safety rules and are 1974 or older models. For more info on vintage stuff, you can contact the AHRMA coordinator, Dave Russel, at (650) 967-0435 in the evening (before lOpm please).
The AFM Formula Pacific Challenge
Formula Pacific the premiere racing class of the AFM is a special class in the AFM. Any motorcycle is allowed provided the expert rider can lap Infineon Raceway (Sears Point) in 1:47 or less; Thunderhill in 1:59 or less; and Buttonwillow in 1: 56 or less. These riders are racing for a cash purse and the AFM's prestigious Top 1-5 Plates for the following race season. The riders in this class are some of the fastest racers on the fastest motorcycles in the country.
The Formula Pacific Series is also one of many promotional opportunities for a company interested in being a partial or full series sponsor. Some of the advantages of being part of the Formula Pacific Challenge are name association with the series, advertising in a number of publications, multiple press releases before and after each event, numerous passes to AFM events, and other valuable exposure opportunities.