Rochester Rough Riders / Austin Stump Jumpers
2018 Class Specific Rules


A Class - Sportsman
1. 36” Maximum Tire Size.
2. Must be 4 or 6 cylinder engine.
3. Single carburetor, OEM injection only or CARB approved replacement fuel injection.
4. Single fuel of Gasoline, E85, Diesel or Propane only no exotic fuels or injections.
5. May modify body but must be of recognizable production style.
6. DOT tires only, cutting allowed.
7. Must use factory style transfer case.
8. Must pull 15 inches of vacuum measured at the manifold, 1000 RPM maximum.
9. Must follow all GENERAL RULES.


B Class – Street Stock
1. Must be DOT Street Legal. (functional headlights, functional taillights, functional brake lights, mirrors, any items to make DOT compliant)
2. Must pull 18 inches of vacuum, measured at the manifold 1000 RPM maximum.
3. Single carburetor, OEM fuel injection, or CARB approved replacement fuel injection.
4. Single fuel of Gasoline, E85, Diesel or Propane only no exotic fuels or injections.
5. Headers allowed must have street legal muffled exhaust. No higher than 99 decibels.
6. Must have complete factory body, no cutting on body or firewall except trimming fenders to clear larger tires.
7. Must have full dash with working speedometer, After-market gauges ok.
8. No gutting of drivers compartment or doors.
9. Must use factory style suspensions, lift kits allowed.
10. DOT UNCUT tires only, 35” or smaller, tire size will be determined by measuring.
11. Must use factory style transfer case.
12. 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 only. 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 the same size factory frame, no cutting on body or firewall except trimming fenders to clear larger tires.
a. Useable flatbeds allowed must be cab width and frame length.
b. Interior removable panels can be eliminated but all interior sheet metal must remain.
c. Glass & 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 suspension 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 offroad event with documentation to support such claim
4. Any Tire type.
5. Single fuel of Gasoline, E85, Diesel or Propane only no exotic fuels or NOS injection.
6. Must follow all GENERAL RULES.


E Class – Pro Stock
1. 54” maximum tire size.
2. All tires allowed except no paddle or bar tires
3. Engine swaps allowed.
4. Vehicle must have a factory frame with a full covered body silhouette, no tube chassis allowed
5. U-joint shields & driveshaft loops are required unless they race in previous classes
6. If there is any structural interior body panel removal will require that a full roll cage be installed with it being frame mounted
7. Must follow all GENERAL RULES.


F Class – Open
1. Any frame and motor combination.
2. Driveshaft safety loops and or u-joint shields required unless running in classes prior to E.
3. Vehicles are required to have full roll cage with it being frame mounted unless running in classes prior to E.
4. Any Tire type.
5. Any fuel combinations allowed
6. Must follow all GENERAL RULES.