If you're interested in American Vintage Motocross in all it's glory, with riders sporting Joffa masks and Authentic Retro gear, or if you're looking for some hard to find parts for a vintage motocross bike you're building from the frame up, you don't want to miss the racing and endless swap meet vendors that gather at the Vintage Motorcycle Days held annually at the Mid-Ohio Motorsports facility in Lexington, Ohio.
What Defines a Vintage Motocross Bike?
Per the AMA rule book, A vintage class bike is defined as a machine originally sold as a pre-1975 (and like design) model with no more than 7 inches of front wheel travel, and a maximum of 4 inches rear wheel travel.
What's ”and like design” all about?
According to the AMA rule book for a vintage machine "Like Design" refers to the frame, swingarm and forks being of a period design and materials.
Note: If you should need to change the frame, swingarm or forks to a different configuration than the way they were designed during the period of time of which the motorcycle was manufactured, or if these parts have been changed / modified before your ownership, be sure to file a written request for approval with the AMA a minimum of 30 days prior to an AMA sanctioned event by emailing your request to: MXRacing@AMACycle.org
What Exactly is an “Evolution” or “Evo” class bike?
Evo bikes are classified in 3 different ways:
- Evolution 1which are machines that were originally sold as pre-1978 (and like design) models with no more than 9 inches of front, or rear suspension travel, and of which the engine is air cooled, forbidding liquid cooling.
Note: "Like Design" in Evolution 1 Classes has the same meaning as for the Vintage Classes but is applicable to all bikes built prior to 1978.
- Evolution 2 classes refer to dirt bikes with air-cooled motors, drum brakes front and rear, and linkage-less rear suspensions.
- Evolution 3 classes refer to dirt bikes with drum-style brakes front and rear, forbidding disc brakes but the engine may be liquid cooled, and / or have linkage style rear suspension.
More info on this and other classes and rules can be found by referring to the AMA Rule book on the AMA Vintage Motorcycle Days Web Site