Scroll down for the rules of the classes we run at Dallas Slot Cars
and in the TSRA Texas Series
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Use the following link to read the TSRA rules for all Texas Series races
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Flexi Rules
Chassis Specifications: All commercially available stamped steel 4-inch FLEXI-type chassis. Suggested retail price of $24.00 are approved.
Flexi Chassis may not be modified. No holes may be drilled in the chassis. No part of the chassis may be removed except the motor bracket.
Cars must maintain .062 ground clearance at all times.
Maximum width is 3 1/4" wide Minimum 3" wide. NO part of the body, chassis, tires, axles or any other part of the car may be wider than 3 1/4" wide.
Can use body clips or pins
Front bumper must be 1/8"
May solder or glue oilites.
May solder motor in place.
May add static weight to chassis.
May add tape to chassis.
May use Commercially available Lightweight Replacement Pan.
May add spacers between pan and center section.
May remove plating on areas to be soldered.
May only reposition front wheel mounts and body mounts location on any chassis.
No ball, roller, needle, or polymer bearings.
Flexi Motor Specifications: Motors for the Flexi classes must be the JK Falcon 7. Motors are factory sealed and should remain sealed. Motors may not be open or tampered. (Wing flexi is the exception to this motor rule)
Flexi Gear Specifications: Any pitch plastic spur gears allowed.
Flexi Axle/Tires Specifications: 1. Any axle size allowed. 2. All 4" type FLEXI type chassis must have o-ring type 2 piece front tires. 3. Front axles may be soldered solid, but front wheels must rotate. Flexi Indy is the exception to this rule. Front tires on flexi Indy must be 3/4" or 5/8" minimum and 1/8" minimum width.
GTP Body Specifications: May use any GTP type or Group 10 body. Body must have 3 numbers and have a 3 dimensional driver.
Nascar Body Specification: May use any Nascar body. COT (Car of Tomorrow) bodies are allowed. Body must have 3 numbers and a 3 dimensional driver.
Can Am Body Specifications: May use any Retro can Am body. 1/2" rear spoiler may be added. Body must have 3 numbers and a 3 dimensional driver.
Indy Body Specifications: May use any Indy Car body. Body must have 3 numbers and a 3 dimensional driver.
No air control can be added to any body. (Can Am is the exception to this rule)
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Wing Flexi Rules
Official TSRA Texas Series Rules
Chassis Specifications: All commercially available stamped steel 4-inch FLEXI-type chassis, with a maximum suggested retail price of $23.00 are approved.
Accepted Modifications: 1. May solder or glue oilites in place. 2. May solder motor in place. 3. May add static weight to chassis. 4. May file holes in motor bracket. 5. May add tape to chassis. 6. May use the same manufacturer's Lightweight Replacement Pan. 7. May add spacers between pan and center section.
Prohibited Modifications: 1. No ball, roller, needle, or polymer bearings. 2. Bat pans and/or center section may not be modified for use of Parma's motor bracket.
Wing Flexi Motor Specifications: Motors are to be racer built SPEED F/X 16D with Balanced armatures. 1. Motor can grinding to remove plating for soldering purposes only is allowed. 2. An axle notch may be cut into the motor can and magnet. 3. Magnets may not be epoxied. Magnets may be glued. 4. Motor can bushing may be soldered or glued in place 5. Balanced American armatures allowed
Wing Flexi Body Specifications: Any 4 inch commercially available 1/24th air controlled body allowed. Bodies must be fully painted including sides, and all window areas left clear. Body must have interior installed in the correct position... Rear wheels wells must be cut out. No cutting into top of body or fenders allowed. May reinforce body. Bodies must have 3 scale-sized numbers. Check body and Air Control Devices guidelines in General Rules.
Wing Flexi Gear Specifications: 1. Any plastic 48/64 pitch spur gear allowed with a 1/8" or 3/32" axle bore is allowed.
Axle/Tires Specifications: 1 . Must have o-ring type 2 piece front tires mounted on a single, solid axle with a minimum diameter of .060. Rear tires have no color requirements. 2. Front axles may be soldered solid, but front wheels must rotate and maintain the original tech functionality of grounding the track prior to the chassis grounding the track.
3. 1/8" or 3/32" solid steel axle is allowed.
Axle/Tires Specifications: 1. 1/8"or 3/32" are solid steel axle allowed. 2. Must have o-ring type 2 piece front tires. Rear tires have no color requirements. 3. Front axles may be soldered solid, but front wheels must rotate and maintain the original tech functionality of grounding the track prior to the chassis grounding the track.
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USRA BOXSTOCK
(these rules are from the USRA rulebook)
A. Motors
Refer to C-Can specifications.
B. Armature
Refer to page 40( from the USRA rulebook) for armature specifications. X-12 or GP-15 armatures may be used.
C. Chassis
1. Chassis for the GP-12 class must be commercially-available and be specifically approved on an "as-submitted" basis, in accordance with the following parameters:
a) Any chassis, which has been submitted and approved, that retails for US $42.89 or less in completed form and which meets all current USRA GP-12 specs, may be used.
b) Chassis must be commercially-available separately, and may also be available in an assembled ready-to-run car.
c) See the GP-12 Approved Components for the list of approved chassis.
2. Chassis may be made of any material.
3. Chassis containing steel components, except steel wire, pillow blocks, motor brace, and lead wire retainer:
a) Must have a guide mount which is integral.
b) Must be made of a continuous piece of steel extending from the guide mount to the rear axle line, to which the pillow blocks are attached.
c) The bottom of the guide mount must be level with the bottom of the chassis with no offset.
d) Steel chassis may be sold as kits, but must be commercially-available in an assembled form. Kits must be assembled in a manner identical to the assembled production chassis except as noted.
4. Front body mounting tubes must be rigidly attached to the chassis (no shakers or floating mounts).
5. Rear body mount may be floated on any steel chassis, but must remain in original location as on the RTR car. Steel pin tubes may be used.
6. May only reposition front wheel mount location on any chassis but wheels must be able to be seen through body wheel well opening. No other component may be altered or repositioned from its original location in RTR car.
7. Minimum weight of a completed, RTR car will be 72 grams at all times during a race.
D. Modifications
Pre-assembled chassis may be re-soldered, but components may not be altered or repositioned, chassis kits must be assembled the same manner as production chassis. Anything not listed here is illegal.
1. Static bracing, consisting of straight piano wire may be added to solder joints only. Wire may not be bent at any angle so as to constitute a brace. Wire may not be soldered to anything else other than the component it is parallel to.
2. No floating pans.
3. On steel chassis, brass and lead may be used for weight.
a) Weights must be solid, rigidly-attached, and not used as a brace. All weight may only be attached to the front and/or to any existing weights. Weight may not be soldered to the center rail or to the side rails.
b) Weights may extend no more than one (1) inch (25.3 mm) back from the center of the guide hole.
c) No modifying or bracing of chassis will be considered to be legal weight.
d) Weights may be soldered to the bottom of the chassis so long as the chassis and attached weight clear the track by 1/16 inch (13.05 mm) at all times.
4. A lead wire retainer may be added.
5. A motor support tube or wire may be added, not to exceed 1-1/2 inches (38.1 mm) in total length behind the motor. Motor must be soldered to this brace or it will be considered an illegal chassis brace. Chassis may have steel pillow blocks and motor brace.
6. May solder or glue oilites in place.
E. Prohibited Modifications:
1. Tie wire.
2. Changes in size, dimension, shape, or location of any component.
F. Lightweight Components
Since the GP-12 class is intended to be an entry-level class, many of the rules are designed to discourage the use of complicated, state of the art, or expensive components. Therefore, special lightweight components are specifically prohibited, including:
1. Magnet wire or magnet type wire as a substitute lead wire.
2. Hollow or special lightweight axles.
J. Bearings
Ball, roller, or other frictionless bearings are allowed in the CAN ONLY. Not allowed on any other part of the car.
K. Weight
Minimum weight for GP-12 cars is 72 grams at all times while racing.
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Motor parts
may be interchanged between different mfg .
TSRA BOX STOCK
Chassis Specifications: Chassis for the Box Stock class will be approved or rejected on an as submitted basis. See: USRA OFFICIAL RULES on approved chassis.
Boxstock Accepted Chassis Modifications: 1. May only reposition front wheel mounts and body mounts location on any chassis. 2. Chassis must be commercially available, must be available separately and may also be available in a completed car. 3. Chassis may be re-soldered. The addition of "floating" body mounts, static body mounts, or a static pan on steel chassis is permissible. 4. Steel chassis may be built from kits as offered by manufactures, but must be built to factory specifications using the same components.
Boxstock Prohibited Chassis Modifications:
1. No ball, roller, needle, or polymer bearings. 2. No other chassis material may be removed accept as defined in the Boxstock Accepted Chassis Modifications.
Motor Specifications:
Motors for the Box Stock class will be approved or rejected on an as submitted basis. Motors must be commercially available, as defined in General Rules, and must be specifically approved. Any motor retailing for $48.43 or less may be used as long as all other Boxstock motor specs are met. Approved motors: Mura M1212, M1213P, M1215P Parma 455 Champion 510X, 511X, 510HTX, 511HTX ProSlot PS728, PS723 Koford 408, M408J Camen 130.10, 130.15 Kelly Racing 1150, 1152
A. Set-up
1. Can & endbell must be mass-produced, of full dimensioned "C" can type (full top and bottom, and vertical bound without cheater tabs or other artificial attempts to meet the dimensional specifications) without modification, and must meet the requirements of USRA Box Stock 2. Inside can dimensions are defined as not less than: Length - .925 inches Width - .835 inches Height .560 inches 3. Motor parts may be interchanged between different mfg. 4. No aluminum endbells allowed. 5. Motors may be blueprinted including gluing, shimming and honing. 6. Magnet Dimensions plus or minus 10% are as follows: 7. Length; 0.500 Inches 8. Height; 0.550 Inches
9. Magnets Must Be Commercially Available Through Major distributors. 10. Quad magnets may be used in Box Stock if they are in the same price range as legal single piece Box Stock magnets. 11. Magnet clips not required 12.Can bushing or bearing may be soldered in place. 13. Diameter of bushing or bushing locator hole may be altered 14. Motor springs may be replaced and spring tension may be adjusted. 15. Magnets may not contain rare earth materials 16. Gaussing of motors/magnets may be performed at Tech in or any time at race director's discretion, suspect motors may be marked to be torn down at the end of the race. Precautions should be taken by race officials to ensure that the motor is not altered prior to teardown. 17. Bearings are allowed in the can only as per the USRA rules.
B. Armature 1. Armatures must tagged 12, X-12, or 15 and must be commercially available as defined in General Rules. approved armatures: Mura M2212, M2213, M2215 Champion 510A, 511A, 510AHT, 511AHT ProSlot 701, 702 RJR 901, 901X, 903, 903X, 931, 931X Koford M387, 468 Camen 1243.10, 1243.15 2. Must be machine wound with a minimum or 50 series wound turns of AWG #29 wire per pole. AWG #29 wire, excluding insulation, is 0.0114 inches maximum diameter. 3. All armatures must retain .513 inches minimum diameter. 4. Minimum stack length for tagged "12" or "X-12" armatures are .350", minimum stack length for tagged "15" armatures is .440". 5. There is no maximum price limit provided the arm meets all other criteria. See Armature Regulation All Classification for further clarification.
Body Specifications:
No Restrictions except for Body and Air Control Devices guidelines in General Rules
Axle/Tires Specifications:
Axles must retail for $5.99 or less. No other restrictions except for Wheels guidelines in
General Rules. Front wheels must maintain the original tech functionality of grounding on the tech block prior to the chassis or body.
Gear Specifications:
Any pitch plastic spur gear
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COBALT 12
Chassis Specifications: No restrictions Motor Specifications: A. Armature 1. Must be tagged with at least the number "12" "X-12"or "15" and be mass-produced by a USRA approved manufacturer. 2. Must be commercially available, as defined in, General Rules. 3. Must be machine wound with a minimum or 50 series wound turns of AWG #29 wire per pole. AWG #29 wire, excluding insulation, is 0.0114 inches maximum diameter. 3. Minimum stack length for tagged "12" armatures is .350", minimum stack length for tagged "15" armatures is .440". 4. There is no maximum price limit provided it meets all other criteria. See Armature Regulation All Classification for further clarification.
Body Specifications: No Restrictions except for Body and Air Control Devices guidelines in General Rules
Gear Specifications:
Any pitch plastic spur gear
Axle/Tires Specifications: No Restrictions except for Wheels guidelines in General Rules.
Front wheels must maintain the original tech functionality of grounding on the tech block prior to the chassis or body
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RETRO CAN-AM RULES
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Rules for 1/24 Texas Can-Am class racing (version V1, 04/29/07)
1. Intent: The intention of this class is to provide a class of primarily scratch-built slot cars reflecting the spirit of the late-1960s racing era, with scale realism and low cost, to attract newcomers and experienced racers and builders.
2. Dimensional Specifications
a. Overall Width: 3.125”(3–1/8”) max (measured across chassis and front/rear wheels)
b. Rear Tire width: 0.800” maximum
c. Rear Tire diameter: 0.8125” (13/16”)minimum
d. Front Tire width: 0.225” minimum
e. Front Tire diameter: 0.625” (5/8”) minimum
f. Clearance: 0.050” minimum (measured under rear axle including gear) and 0.015” minimum (measured under front axle). Both clearances measured with car standing on a flat tech board on its wheels, without guide.
g. Weight: No minimum or maximum weight
3. Chassis construction:
a. Chassis type: Any personally-built or commercially available scratch built chassis conforming to these specifications and to the spirit of the intent statement is allowed.
b. Chassis Materials: Brass sheet, brass rod and tube, piano wire, steel pin tubing and steel guide tongues are allowed. Stamped or formed brass parts such as motor brackets and guide tongues are allowed. Stamped steel parts (other than guide tongues) and EDM or laser-cut parts of any material are not allowed.
c. Drive type: Inline drive only, with the motor shaft at 90 degrees to the rear axle.
d. Drive gears: Drive gears and ratios are free.
e. Chassis hinges: Drop arms are allowed on all chassis designs. Non-hinged chassis designs are allowed. Other than a drop arm, all hinged movements must be oriented in one direction on any chassis (i.e. either side pan hinges OR a plumber hinge, NOT BOTH). Centerline hinges (flexi hinges) are not allowed.
f. Front axle: A single front axle is required, carrying both front wheels. The axle may be fixed or in a tube. NO hinged front wheel movements are allowed (i.e. no “L” arms). Front wheels may rotate independently.
g. Guide: One guide flag (or pin) centered on the longitudinal axis of the chassis (i.e. no sideways “float” or offset) is allowed.
h. Bearings: Free.
i. Axle sizes: 3/32nd minimum
4. Other Requirements:
a. Motor type: Unopened, unmodified JK Falcon 7 motor only
b. Body style: Any body of a closed-wheel race car from 1969 or older(1969, 1968, 1967, etc). “Flattened” or “aerodynamically improved” bodies are strongly discouraged(i.e. no molded-in spoilers, wings etc that were not on the original full-size car) and will be subject to the race directors discretion. Front wheel arches do NOT have to be cut out, but may be if so desired for realism. If the wheel arches are NOT cut out, that part of the body must be left unpainted so as to display the front wheels. Rear wheel arches may be left closed if the original full-size car ran with closed wheel arches. Bodies must be presentably painted and carry at least three racing numbers, one on each side, and one on the front.
c. Spoilers and air control: A single clear plastic spoiler may be added to the rear of the body only, extending no higher than 0.5” above the rear edge of the body and no wider than the outer edges of the body. Spoilers may be painted or carry stickers. No side dams of any type are allowed. Front diaplanes are not allowed.
d. Interior: All bodies must carry a painted (at least two colors), three-dimensional interior comprising a driver (helmet, shoulders and arms) a steering wheel and a cockpit representation.
e. Protrusions: No part of the chassis, wheels, tires, guide, etc may be visible outside of, or through the body when viewed from directly above.
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