USAP Classes

Super Farm Stock

1. Super Farm Stock will run any gear. (3 MPH Max)
2. Tires sizes 15.5 x 38 max, or 14.9 x 30, 16.9 x 28. (16" rim max.). 
   18.4 x 38 7000#-8500# (16" rim max.) Front tires must be at least 14" and AG tires (3 Rib or Multi-Rib allowed)
3. Top cut tires allowed — No front edge cut allowed
4. Stock sheet metal and hoods. Stock wheel base.
5. 1959 and older.

Modified Stock

1. Modified Stock will run any gear (4 MPH Max)
2. Tire size will be 18.4 x 38. Cut tires allowed.
3. Stock sheet metal and hoods. Stock wheel base!
4. 1959 and older.

Pro Stock

1. Pro Stock will run any gear (6 MPH Max)
2. Tire size will be 18.4 x 38. Cut tires allowed.
3. Stock sheet metal and hoods. Stock wheel base!!
4. Dead man throttles, except hand clutch tractors (hand must be on the clutch while pulling) are recommended.
5. 1959 and older.

Super Pro Stock

1. Super Pro Stock will run any gear (8 MPH Max)
2. Tire size will be 18.4 x 38. Cut tires allowed.
3. Must run side shields 1/16" steel OR 1/8" aluminum.
4. Stock sheet metal and hoods. Stock wheel base!!
5. Dead man throttles, except hand clutch tractors (hand must be on the clutch while pulling) are recommended.
6. 1959 and older.

Open Pro Stock

1. Open Pro Stock will run any gear (12 MPH Max)
2. Tire size will be 18.4 x 38. Cut tires allowed.
3. Must run side shields 1/16" steel OR 1/8" aluminum.
4. Stock sheet metal and hoods. Stock wheel base!
5. Dead man throttles, except hand clutch tractors (hand must be on the clutch while pulling) are recommended.
6. 1959 and older.