2024 Class Rules
Classes
1050 Lb. Stock
1050 Lb. Bike (250 cc)
1150 Lb. Big Stock
1150 Lb. Pro Modified
1300 Lb. Bike (650cc & 1350 cc)
1500 Lb. Mini Rod 4-cyl
1500 Lb. Modified 4-cyl
1700 Lb. Econo Modified 8-cyl
2000 Lb. Modified 8-cyl
2050 Lb. Big Tire
1050 Lb. Stock
1.
Stock engine only not exceeding 14 HP and 32 cubic inches from the OEM, Maximum .030" over bore.
Stock engine only not exceeding 14 HP and 32 cubic inches from the OEM, Maximum .030" over bore.2.0.330 Maximum cam lift.
0.330 Maximum cam lift.3.Maximum 1" venture carburetor.
Maximum 1" venture carburetor. 4.Throttle to be run through a working governor, 4000 rpm maximum.
Throttle to be run through a working governor, 4000 rpm maximum.5.Porting and polishing is not allowed.
Porting and polishing is not allowed.6.Gasoline or diesel only.
Gasoline or diesel only.7.Maximum tractor length shall not exceed 6'6" from center of rear axle.
Maximum tractor length shall not exceed 6'6" from center of rear axle.8.Tractor must have hood and grill.
Tractor must have hood and grill.9.Maximum drive tire size: 23x10.5x12.
Maximum drive tire size: 23x10.5x12.10.Transmission gear ratio changes allowed.
Transmission gear ratio changes allowed.11.Drivers up to 17 years of age and/or High School.
Drivers up to 17 years of age and/or High School.1050 Lb. Bike 250cc
1. 250 cc stock engine only
2. Single or twin cylinder 2 or 4 stroke
3. Carburetor only, no modifications, no porting and polishing, no fuel injection, no computer engines.
4. Pump gasoline only
5. OEM lawn mower transmission - gear ratio changes allowed
6. Jackshafts allowed
7. Maximum drive tire size: 23x10.5x12. Tires may be cut.
8. 48 inch rear wheel width maximum
9. Maximum tractor length shall not exceed 6'6" from center of rear axle to furthest point forward.
10. Modified frame allowed
11. Must have hood, grill & fenders
12. Drivers in this class must be at least 12 years old.
13. All TMTPA general rules apply
1150 Lb. Big Stock
1. Single or Twin cylinder, complete stock motor only not exceeding 25 HP from the OEM.
2. 0.330 Maximum cam lift on flathead engines and no more than 10% over OEM stock V-Twin cam lift.
3. Maximum 1" venture carburetor.
4. Air cleaner and filters are optional.
5. Throttle to be run through a working governor with factory or man made positive stop mounted on engine block (no slippage), 4000 rpm maximum.
6. Stock bore and stroke, cylinder must not exceed 0.030 over the original bore diameter.
7. Stock valve diameters only for block being used.
8. Porting and polishing is not allowed.
9. Gasoline or diesel only
10. Maximum wheelbase is 52" with the front axle not to exceed the forward most part of the frame, whichever is less. Maximum tractor length is 6'6" as measured from center of rear axle to farthest most forward point.
11. Tractor must have hood and grill.
12. Maximum drive tire size 26x12x12
13. Tractor must have stock rear-end of a lawn and garden type.
14. Transmission gear ratio changes allowed.
15. Tractor must use stock garden tractor type frame, only modification for engine change allowed.
1150 Lb. Pro Modified
1.Any combination of engines allowed, excluding automotive, motorcycle, snowmobile or ATV type engines.
Any combination of engines allowed, excluding automotive, motorcycle, snowmobile or ATV type engines. 2.Gas, alcohol, or diesel only. Propane injection allowed on diesels only, see rule # 6 under "Tractor" in General Rules.
Gas, alcohol, or diesel only. Propane injection allowed on diesels only, see rule # 6 under "Tractor" in General Rules.3.Turbochargers allowed on diesels only.
Turbochargers allowed on diesels only.4.Maximum tractor length shall not exceed 6'6" from center of rear axle to the furthest most point.
Maximum tractor length shall not exceed 6'6" from center of rear axle to the furthest most point. 5.Maximum tire size: 26x12x12.
Maximum tire size: 26x12x12.6.All other modifications allowed.
All other modifications allowed.7. 3/8 safety cable on hitch
1300 Lb. Motorcycle (Small Bike and Super Bike)
Small Bike maximum 650 CC OEM, Super Bike maximum 1350 CC OEM.
1.Gas or alcohol only.
Gas or alcohol only.2.Hood and grill optional.
Hood and grill optional.3.Naturally aspirated motorcycle engines only.
Naturally aspirated motorcycle engines only. 4.Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point.
Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point. 5.Maximum drive tire size: 26x12x12.
Maximum drive tire size: 26x12x12.1500 Lb. Mini Rod 4-cyl
1.Engine must be OEM block not to exceed 4 cylinders.
Engine must be OEM block not to exceed 4 cylinders.2.Gas, alcohol or diesel fuel only.
Gas, alcohol or diesel fuel only. 3.Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8’ from center of rear axle to the furthest most point.
Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8’ from center of rear axle to the furthest most point. 4.Maximum drive tire size: 26x12x12.
Maximum drive tire size: 26x12x12.5.Drivers in this class must be at least 14 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials.
Drivers in this class must be at least 14 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials. 1500 Lb. Modified 4-cyl
1.Engine must be OEM block not to exceed 4 cylinders.
Engine must be OEM block not to exceed 4 cylinders.2.Gas, alcohol or diesel fuel only, turbochargers and superchargers allowed.
Gas, alcohol or diesel fuel only, turbochargers and superchargers allowed. Superchargers must have adequate restraint to prevent blower lift off.
3.Diesel engine tractors only may run any combination of propane injection, methanol/water injection or nitrous oxide injection as power adders only. For propane injection, see rule # 6 under "Tractor" in General Rules.
Diesel engine tractors only may run any combination of propane injection, methanol/water injection or nitrous oxide injection as power adders only. For propane injection, see rule # 6 under "Tractor" in General Rules.4.Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8’ from center of rear axle to the furthest most point.
Tractor width shall not exceed 60". Maximum tractor length shall not exceed 8’ from center of rear axle to the furthest most point.5.Maximum drive tire size: 26x12x12.
Maximum drive tire size: 26x12x12.6.Drivers in this class must be at least 14 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials.
Drivers in this class must be at least 14 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials.1700 Lb. Econo Modified 8-cyl
1.Engine must be OEM block not to exceed 8 cylinders.
Engine must be OEM block not to exceed 8 cylinders.2.Naturally aspirated engine only.
Naturally aspirated engine only.3.Gas or alcohol fuel only.
Gas or alcohol fuel only. 4.Single carburetor only.
Single carburetor only.5.No aluminum heads.
No aluminum heads.6.Tractor width shall not exceed 60”. Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point.
Tractor width shall not exceed 60”. Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point. 7. Maximum drive tire size: 26x12x12.
8.Drivers in this class must be at least 16 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials.
Drivers in this class must be at least 16 years old or driver must be old enough to handle the tractor. To be determined by TMTPA officials.2000 Lb. Modified 8- cyl
1.Naturally aspirated engine only.
Naturally aspirated engine only.2.Gas or alcohol fuel only.
Gas or alcohol fuel only.3.Maximum drive tire size: 31x15.50x15.
Maximum drive tire size: 31x15.50x15.4.A 4 point frame mount roll cage of round or square tubing with .090 wall thickness and 1 ½" minimum o.d. recommended. Cage must enclose the driver and be capable of supporting the completion weight of the tractor. Minimum 4 pt. safety harness recommended. Minimum requirement will be a roll bar at least .125 thick X 2" o.d., and of adequate height and placement to protect driver in event of a rollover. Lap belt also required.
A 4 point frame mount roll cage of round or square tubing with .090 wall thickness and 1 ½" minimum o.d. recommended. Cage must enclose the driver and be capable of supporting the completion weight of the tractor. Minimum 4 pt. safety harness recommended. Minimum requirement will be a roll bar at least .125 thick X 2" o.d., and of adequate height and placement to protect driver in event of a rollover. Lap belt also required.5.Tractor width shall not exceed 72”. Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point.
Tractor width shall not exceed 72”. Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point. 6.Skid Pad/Plate requirement – minimum size will be 3” wide by 8” long with at least a 15 degree bend at the front of the skid pad, 1/8" steel or 3/16" aluminum. Skids must be attached to the frame rail on each side and as close to each front tire as possible without interfering with wheel travel or turning. Maximum ground clearance not to exceed 2” with the front tire in normal operating position. OR x .120" mild steel tubing or same material as tractor frame rails. Front axle support should connect to each frame rail inline and extend toward front of tractor. Front skid/front axle support should have radius to prevent digging into track. Front axle support frame should be strong enough to support front end weight of tractor. Support should have a maximum of 4" ground clearance. Note: Skid plate must be able to support weight of the front end when checked with a jack.
Skid Pad/Plate requirement – minimum size will be 3” wide by 8” long with at least a 15 degree bend at the front of the skid pad, 1/8" steel or 3/16" aluminum. Skids must be attached to the frame rail on each side and as close to each front tire as possible without interfering with wheel travel or turning. Maximum ground clearance not to exceed 2” with the front tire in normal operating position. OR x .120" mild steel tubing or same material as tractor frame rails. Front axle support should connect to each frame rail inline and extend toward front of tractor. Front skid/front axle support should have radius to prevent digging into track. Front axle support frame should be strong enough to support front end weight of tractor. Support should have a maximum of 4" ground clearance. Note: Skid plate must be able to support weight of the front end when checked with a jack.7.Drivers in this class must be at least 17 years old.
Drivers in this class must be at least 17 years old.2050 Lb. Big Tire
RULES BEING DEVELOPED FOR THE 2024 SEASON - CHECK BACK
1. Naturally aspirated engine only.
2. Gas or alcohol fuel only.
3. Single carburetor only.
4. Maximum drive tire size: _______________________
5. Tractor width shall not exceed _____. Maximum tractor length shall not exceed 8' from center of rear axle to the furthest most point.
6. A 4 point frame mount roll cage of round or square tubing with .090 wall thickness and 1 ½" minimum o.d. recommended. Cage must enclose the driver and be capable of supporting the completion weight of the tractor. Minimum 4 pt. safety harness recommended. Minimum requirement will be a roll bar at least .125 thick X 2" o.d., and of adequate height and placement to protect driver in event of a rollover. Lap belt also required.
7. Skid Pad/Plate requirement – minimum size will be 3” wide by 8” long with at least a 15 degree bend at the front of the skid pad, 1/8" steel or 3/16" aluminum. Skids must be attached to the frame rail on each side and as close to each front tire as possible without interfering with wheel travel or turning. Maximum ground clearance not to exceed 2” with the front tire in normal operating position. OR x .120" mild steel tubing or same material as tractor frame rails. Front axle support should connect to each frame rail inline and extend toward front of tractor. Front skid/front axle support should have radius to prevent digging into track. Front axle support frame should be strong enough to support front end weight of tractor. Support should have a maximum of 4" ground clearance. Note: Skid plate must be able to support weight of the front end when checked with a jack.
8. Drivers in this class must be at least 17 years old.
TMTPA OFFICIALS DECISIONS AND DIRECTIVES ARE FINAL AND TMTPA OFFICIALS RESERVE THE RIGHT TO REFUSE ENTRY TO ANY PULLER OR VEHICLE.
PULLING WITH US IS MORE THAN JUST A DRAG!
Texas Minirod Tractor Pullers Association
