2021 Race Class Rules

​A Class- Sportsman
  1. Must be 4 or 6 cylinder
  2. Single carburetor, OEM injection, or CARB approved fuel injection
  3. Single fuel of Gasoline, E85, Diesel, or Propane only, No exotic fuels or NOS injection
  4. May modify body but must be of recognizable production style
  5. DOT tires only, cutting allowed
  6. Must use factory style transfer case
  7. Must pull 15 inches of vacuum measured at the manifold, 1000 RPM maximum
  8. Must follow all General Rules
 
B Class-Street Stock
  1. Uncut DOT tires only, 35” or smaller
  2. Must be DOT street legal
    1. Functional headlights
    2. Functional taillights
    3. Functional brake lights
    4. Mirrors
    5. Must have street legal muffled exhaust, no higher than 99 decibels.  Headers allowed
    6. Any items to make it DOT Compliant
  3. Must pull 18 inches of vacuum, measured at manifold at 1000 RPM maximum
  4. Single carburetor, OEM fuel injection, or CARB approved fuel injection.
  5. Single fuel of Gasoline, E85, Diesel, or Propane.  No exotic fuels or NOS injection
  6. Must have complete factory body, no cutting of body or firewall except trimming fenders to clear larger tires
  7. Must have full dash with working speedometer, after market gauges allowed
  8. No gutting of drivers compartment or doors
  9. Must use factory style suspension, lift kits allowed
  10. Must use factory style transfer case
  11. Must follow all general rules
 
C Class-Super Stock
  1. 36” maximum tire size
  2. DOT tires only, cutting allowed
  3. Engine swaps allowed
  4. Single fuel of Gasoline, E85, Diesel, or Propane. No exotic fuels or NOS injection
  5. Single carburetor, OEM fuel injection, or CARB approved replacement fuel injection
  6. Must pull 15 inches of vacuum, measured at the manifold, 1000 RPM Maximum
  7. Must have complete factory body matching same size factory frame
    1. No cutting of body or except trimming fenders to allow larger tires
    2. Must have factory radiator support and tie bar panel(aka header panel, panel that headlights and grill mount to)
    3. If applicable, box may be replaced by a useable flatbed that is cab width and frame length
    4. Interior removable panels can be eliminated but all interior sheet metal must remain unless a frame mounted full roll cage is installed
    5. Glass and bumpers can be removed
  8. Open headers allowed
  9. Transmission brake not allowed. Vehicle may have the system but must have a disarm switch
  10. Factory style suspension required, no additional traction link from frame to axle allowed
  11. Must follow all general rules
 
D Class- Trail
  1. Any frame and motor combination
  2. Must meet all Rochester Rough Rider trail vehicle safety rules​
  3. Must have previously attended and participated in a club or state sponsored off road event with documentation to support such claim
  4. Any tire type and size
  5. Exhaust must meet the DNR maximum decibel reading of 99 decibels
  6. Vehicle must have current OHV sticker
  7. Single fuel of Gasoline, E85, Diesel, or Propane.  No exotic fuels or NOS injections
  8. Must follow all general rules
 
E Class- Pro Stock
  1. Any tire type
  2. Engine swaps allowed
  3. Any frame and motor combination
  4. Any fuel combination
  5. U Joint shields and driveshaft loops required unless the truck qualifies for a lower class
  6. A Frame mounted full roll cage is required if any interior structural body panel is removed
  7. 4 point racing harness required unless vehicle qualifies for lower class
  8. NOS and forced induction allowed
  9. Must follow all general rules
 
F Class- Open
  1. Any frame and motor combination
  2. U Joint shields and driveshaft safety loops required unless vehicle qualifies for a lower class
  3. Vehicle are required to have a frame mounted full roll cage unless vehicle qualifies for a lower class
  4. Any tire type
  5. Any fuel combination allowed
  6. NOS and forced induction allowed
  7. 4 point racing harness required
  8. Must follow all general rules