R500: Modified 4500 - 4599
Modified
Modified
GENERAL REGULATIONS
Entrants in this class shall comply with all applicable general regulations.
TECHNICAL REGULATIONS
This class is an open class and all components will be considered open unless restricted herein.
NOTE: The TR abbreviations listed under this class (I.E. TR1 HELMETS) refer to TR cross reference listings in the front of this book. These TR cross-referenced listings are part of the class rules. Where a conflict occurs between the TR cross-referenced listing and a rule contained under this class, the rule contained under this class takes priority.
SAFETY EQUIPMENT
TR1 HELMETS
TR2 PROTECTIVE CLOTHING
TR3 EYE PROTECTION and DENTURES
TR4 HEAD AND NECK RESTRAINTS
TR5 FIRST AID KIT
TR6 EMERGENCY SIGNALING DEVICES
TR7 HORNS
TR8 REFLECTORS
TR9 FIRE SUPPRESSION EQUIPMENT
TR10 SURVIVAL SUPPLIES
SUSPENSION COMPONENTS
Independent Suspended vehicles must use OEM Factory Frame and OEM Factory Body Style for that make/model year and the vehicle must have been Independent for that make/model year.
Pivot points are open.
TR11 SHOCK ABSORBERS and BUMP STOPS
Maximum Two (2) shocks per corner.
Maximum shock body outside diameter 2.65 inches (67mm).
Maximum shock stroke is fourteen (14) inches.
Shocks must mount to chassis and axle only, no linkage mounted shocks allowed.
TR12 SECONDARY SUSPENSION
TR13 WHEELS and TIRES
Maximum tire diameter is 37 inches.
Must be DOT.
TR14 FASTENERS
STEERING and BRAKE COMPONENTS
TR15 STEERING
Mechanical steering is required.
Hydraulic and electric power assist is allowed.
No full hydraulic steering allowed.
No rear steer allowed.
Steering must turn wheels lock to lock if the hydraulics are removed.
TR16 BRAKES
ELECTRICAL SYSTEM
TR17 IGNITION
TR18 BATTERIES
TR19 BATTERIES
TR20 STARTERS
FUEL SYSTEM
TR21 FUEL
TR22 FUEL TANKS
TR23 FUEL FILLERS LINES, VENTS, and CAPS
ENGINE, TRANSMISSION and DRIVELINES
TR24 ENGINE and ENGINE DISPLACEMENT
Front engine only.
TR25 ENGINE REPLACEMENT
TR26 TRANSMISSION
TR27 THROTTLES
TR28 EXHAUST
TR29 DRIVE SHAFTS
TR30 FLYWHEEL SHIELDS
TR31 FLUID COOLERS
TR32 AUXILIARY EQUIPMENT
TR33 SUPERCHARGERS and TURBOCHARGERS
VEHICLE SAFETY EQUIPMENT
TR34 ROLL CAGES
TR35 SAFETY HARNESS
TR36 SAFETY NETS
TR37 SEATING
GENERAL VEHICLE COMPONENTS
TR38 DRIVERS COMPARTMENT
TR39 DOORS AND LATCHES
TR40 FIREWALLS
TR41 BALLAST
TR42 WEIGHT
TR43 FLOORBOARDS
TR44 BUMPERS and HAZARDOUS PROTRUSIONS
TR45 MIRRORS
TR46 SKID PLATES
TR47 STORAGE
TR48 CHASSIS and BODY
Must maintain a production appearing utility or sports utility body.
Stock appearing grill and headlight opening must be retained.
Body subject to Unlimited Off-Road Racing approval.
Stock frame, or boxed frame must run from the OEM motor mount location to behind the rearmost portion of the driver's seat seats.
Fabricated frames must be minimum 1.5” (38mm) x 3” (75mm) x 0.120” (3.0mm).
Fabricated frame rails must have an inside minimum measurement of sixteen (16) inches.
Independent Suspended vehicles must use OEM Factory Frame and OEM Factory Body Style for that make/model year and the vehicle must have been Independent for that make/model year.
Frame requirements will exceed class rules to include suspension mounting points for the independent portion of the suspension.
TR49 HOSES
TR50 IDENTIFICATION MARKINGS
Unlimited Off-Road Racing will assign race numbers.