1.) MUST BE COMMERCIALLY AVAILABLE APPROVED CHASSIS.

2.) MUST BE STAMPED AND FORMED METAL. THE PORTIONS TO WHICH THE MOTOR IS ATTACHED MUST BE STEEL, FLOATING PANS MAY BE STEEL, ALUMINUM OR BRASS.

3.) MAY UPDATE CHASSIS TO RTR SPECS. MAY USE LIGHTWEIGHT REPLACEMENT PANS AND CENTER SECTIONS.

4.) MAY INTERCHANGE PARTS FROM A SINGLE MANUFACTURER SUCH AS FLEXI AND FLEXI-2 PARTS, SLOTWORKS LONG OR SHORT PANS ON SLOTWORKS CHASSIS, JK LONG OR SHORT CENTER SECTIONS AND HEAVY OR LIGHT PANS ON JK CHASSIS.

5.) NO MODIFICATIONS EXCEPT FOR THE FOLLOWING;

A. MAY SOLDER OR GLUE MOTOR, AXLE OILITES AND FRONT WHEEL RETAINERS.

B. MAY ADD LEAD WEIGHT AND TAPE CHASSIS.

C. MAY FILE HOLES IN MOTOR BRACKET TO ALLOW BETTER GEAR MESH, BUT MUST RETAIN A PORTION OF MOTOR BRACKET.

D. NO OILITE MODIFICATIONS ALLOWED. MAY USE OFFSET OILITES.

E. MAY ADD SPACERS BETWEEN PAN AND CENTER SECTION.

F. MAY ADD A 1 INCH LONG MOTOR BRACE AND A UPRIGHT BRACE.

G. THE ORIGINAL MFG’S PLATING MAY BE REMOVED IN THE AREAS TO BE SOLDERED ONLY.

H. MAY ADD PIN TUBES. PIN TUBES MAY BE SOLID OR FLOATING. MAY ADD LEAD WIRE RETAINER.

I. MAY SOLDER ON STEEL GUIDE TONGUE REINFORCEMENT SUCH AS SLICK 7 BUT THE ORIGINAL TONGUE MAY NOT BE REMOVED, MODIFIED OR MOVED.

J. NO OTHER MODIFICATIONS, SOLDERING, CUTTING, GRINDING OR BRACING ALLOWED.

K. MAY USE ANY GUIDE, NUT, SPACERS LEAD WIRES AND CLIPS.

MOTOR SET-UPS

MUST BE COMMERCIALLY AVAILABLE, MEET ALL USRA MANUFACTURING SPECS AND BE APPROVED FOR USE IN THIS CLASS BY THE USRA. THE MINIMUM PIECES REQUIRED FOR APPROVAL IS 500 PIECES AND AVAILABLE 90 DAYS PRIOR TO THE NATIONAL EVENT THROUGH DISTRIBUTORS.

STOCK 16-D

1.) STOCK 16-D STYLE SET-UPS ONLY. APPROVAL IS BASED ON PRODUCTION SET-UP ONLY. SET-UP MUST BE COMMERCIALLY AVAILABLE WITH PART NUMBER AND RETAIL PRICE NOT TO EXCEED $ 9.00 U.S.

2.) NO MODIFICATIONS EXCEPT FOR;

A.) MAY ADD OR CHANGE CAN SCREWS.

B.) MAY ADD SPACERS TO LIMIT END PLAY.

C.) MAY DYE ARMATURE.

D.) MAY RETRUE COMMUTATOR.

E.) MAY ZAP MAGNETS.

F.) MAY SUPER GLUE MAGNETS IN PLACE.

G.) MAY CHANGE BRUSHES AND USE ANY REPLACEMENT 16-D MOTOR SPRINGS.

H.) NO POLISHING OF MAGNETS ALLOWED.

I.) NO SHIMMING OR HONING OF MAGNETS.

J.) BALANCING ALLOWED.

K.) MIN. DIAMETER OF ARMATURE .513".

L.) MIN. AIR GAP .575"

M.) MAY NOT INTERCHANGE PARTS BETWEEN MFG’S SET-UPS.

N.) CAN OILITE MAY BE SOLDERED IN PLACE.

O.) MAY USE MURA ENDBELL HARDWARE AS REPLACEMENT HARDWARE.

P.) MAY SOLDER HOODS TO BRUSH PLATES.

CANS ( D-CANS)

A.) MUST BE MADE FROM METAL AND HAVE NO CUT OUTS OR METAL REMOVED FROM SIDES OF CAN. THE ONLY ALLOWABLE CUT OUTS ARE THE AXLE NOTCHES. ONLY ONE HOLE IS ALLOWED ON THE TOP AND BOTTOM OF CAN. NO STRAP TYPE CANS ALLOWED. CANS MUST HAVE A FULL TOP AND BOTTOM. NO CHEATER TABS ALLOWED.

B.) MUST MEET THE FOLLOWING INSIDE DIMENSIONS

HEIGHT .600"

WIDTH .875"

LENGTH .950"

MAGNETS 16-D

MUST BE STOCK ONE PIECE SINGLE ( NO QUADS) CERAMIC MAGNETS AS FOUND IN THE PRODUCTION MOTOR AND MEET THE FOLLOWING MINIMUM DIMENSIONS

HEIGHT .580"

LENGTH .650"

THICKNESS .150"

ARMATURES 16-D

MUST BE COMMERCIALLY AVAILABLE AND APPROVED BY THE USRA AND FOLLOW ALL COMMERCIALLY AVAILABLE GUIDELINES.

A.) MINIMUM DIAMETER OF .513"

B.) MINIMUM STACK LENGTH .600" NO SPLIT STACK/LAMINATION ARMS ALLOWED.

C.) ARM MAY BE DYED.

D.) MAY BE BALANCED

E.) MAY HAVE COMMUTATOR TIE WRAP. TIE MUST BE FACTORY DONE.

F.) MUST BE TAGGED 16-D.

G.) COMMUTATOR MAY BE TRUED.

H.) MUST BE WOUND WITH 70 SERIES WOUND TURNS OF U.S. 30 GAUGE WIRE (.0099-.0101 INCHES EXCLUDING INSULATION) PER POLE.

BODIES

MUST BE COMMERCIALLY AVAILABLE AND APPROVED FOR USE BY USRA. THE ONLY BODIES ALLOWED IS 1/24 4" STOCK CAR TYPE BODIES.

1.) NO AIR CONTROL DEVICES ALLOWED. NO ALTERNATIONS OR ADDITIONS TO THE ORIGINAL DIMENSIONS ARE PERMITTED. BODY MUST COVER THE ENTIRE CHASSIS WHEN VIEWED FROM ABOVE. FRONT WHEEL WELLS MAY BE CUT OUT OR LEFT CLEAR. NO CUTTING INTO THE TOP OF THE FENDERS. MAY REINFORCE BODY USING TAPE AND LEXAN.

2.)SEE SPEC SHEET FOR ALL BODY MEASUREMENTS.

A.) MINIMUM ROOF HEIGHT IS 1 1/2" MEASURED FROM TECH BLOCK.

B.) MIN. 1/8" FRONT AND REAR BUMPERS. MAY NOT CUT OUT REAR OF BODY.

C.) ALL WINDOWS MUST BE CLEAR.

D.) BODIES MUST HAVE FULL PAINTED 1/24 STOCK CAR INTERIOR. CHASSIS OR TRACK MUST NOT BE VISIBLE.

E.) REAR SPOILER MAXIMUM HEIGHT IS 3/8" MEASURING THE ACTUAL BLADE/CORD LENGTH. MAY ADD LEXAN TO MEET THIS MEASUREMENT. MAX WIDTH OF REAR SPOILER 3 1/4" MAY ADD LEXAN TO MEET THIS MEASUREMENT.

NO "GURNEY LIP" LIP OR ADDITIONAL BENDS IN SPOILER ALLOWED.

F.) MUST HAVE THREE DECAL OR PAINTED NUMBERS PLACED ON BODY. ONE ON EACH DOOR AND ONE ON THE ROOF. BODIES SHOULD BE PAINTED TO RESEMBLE REAL STOCK CARS.

G.) SEE APPROVED BODY LIST

GEARS

ANY GEAR RATIO ALLOWED, BUT MUST USE 48 PITCH GEARS. MAY SOLDER PINION ON MOTOR.

AXLES/WHEELS/TIRES

A.) THE CAR MUST HAVE A SINGLE ONE PIECE FRONT AXLE THAT PASSES THROUGH BOTH UPRIGHTS.

B.) FRONT AXLE MIN. DIA. .047". FRONT WHEEL MIN DIA. 1/2".

C.) MAY SOLDER FRONT RETAINERS TO FRONT AXLE. MAY SOLDER FRONT AXLE WHERE IT PASSES THROUGH CHASSIS. FRONT AXLES MAY BE BENT.

D.) ANY TYPE FRONTS ALLOWED. MUST BE MOUNTED TO FRONT AXLE ONLY.

E.) ANY BLACK REAR TIRE ONLY. MIN. DIA. .750".

F.) MUST BE 1/8" REAR AXLE ONLY. MAY USE DRILL BLANK AXLES. AXLES MUST BE STEEL. NO HOLLOW OR OTHER LIGHTWEIGHT AXLES ALLOWED.

G.) FRONTS MUST BE MOUNTED TO FRONT AXLE.

CLEARANCE

MIN. REAR CLEARANCE 1/16" INCLUDING GEAR.