Observed Trials

p) 70+: Riders aged 70 and older on any eligible vintage machine.

See Section 11.1.19. q) WOMEN: Female riders on any eligible vintage machine. See Section 11.1.20.

8.14 POST VINTAGE MOTOCROSS

a) HISTORIC 125: Certain 125cc and smaller motorcycles built up to and including the 1977 model year as the first-generation of long-travel machines. See

Section 12.1.2. b) HISTORIC 250: Certain 126-250cc motorcycles built up to and including the 1977 model year as the first-generation of long-travel machines.

See Section 12.1.3. c) HISTORIC 500: Certain 325-460cc two-strokes and four-strokes up to 636cc built up to and including the 1977 model year as the first-generation of long-travel machines. See Section 12.1.4. d) HISTORIC FOUR-STROKE: Certain four-stroke machines built up to and including the 1978 model year with up to 636cc. Overhead-cam machines are limited to 500cc See Section 12.1.5. e) GRAND PRIX 125: Certain post-1977 motorcycles, 88-125cc.

See Section 12.2.2. f) GRAND PRIX 250: Certain post-1977 motorcycles, 126-250cc.

See Section 12.2.3. g) GRAND PRIX 500: Certain post-1977 motorcycles, 325-500cc two-stroke and up to 580cc four-stroke. See Section 12.2.4. h) ULTIMA 125: Certain motorcycles up to 125cc that do not have disc brakes or power-valve type mechanism built directly into the engine. See Section 12.3.2. i) ULTIMA 250: Certain 126-250cc motorcycles that do not have disc brakes or power-valve type mechanism built directly into the engine. See Section 12.3.3. j) ULTIMA 500: Certain 325-580cc motorcycles that do not have disc brakes or power-valve type mechanism built directly into the engine. See Section 12.3.4. k) ULTIMA FOUR-STROKE: Certain 200cc-580cc four-stroke motorcycles produced after the Historic period, including those with single-shock rear suspension or newer engine technology. See Section 12.3.5. l) OPEN AGE: Any rider on any eligible machine. See Section 12.4.1. m) 40+: Riders aged 40 and older on any eligible machine. See Section 12.4.2. n) 50+: Riders aged 50 and older on any eligible machine. See Section 12.4.3. o) 60+: Riders aged 60 and older on any eligible machine. See Section 12.4.4. p) 70+: Riders aged 70 and older on any eligible machine. See Section 12.4.5. q) WOMEN: Female riders on any eligible machine. See Section 12.4.6.

8.15 OBSERVED TRIALS

a) PREMIER HEAVYWEIGHT: Pre-1965-era machines 350cc and larger.

See Section 13.1.1. b) PREMIER LIGHTWEIGHT: Pre-1965-era machines up to 250cc.

See Section 13.1.2. c) RIGID LIGHTWEIGHT: Any non-swingarm machine up to 300cc.

See Section 13.1.3. d) RIGID HEAVYWEIGHT: Any non-swingarm machine 301cc or larger.

See Section 13.1.4 e) GIRDER FORK: Any rigid-frame, girder-fork machine. See Section 13.1.5. f) MODERN CLASSIC: Any unit-construction machine up to model year 1979.

See Section 13.1.6.