2025 Winter Rules
Any 4″ stamped steel 2 or 3 piece chassis readily available at least 30 days before season start.
specifically for the 2025 season, the chassis and it’s components must be commercially available by December 1st, 2024
The chassis may have a minimum of two and maximum of three chassis parts. All chassis will consist of one solid center section and a maximum of two separate pans. Two piece center sections are not allowed. The portion of the center section to which the motor is attached must be steel. The pans may be steel or aluminum. No Home Made/Carbon Fiber/Plastic/Molded/Printed parts allowed.
The chassis blanks may be cut with a Laser, EDM, Water Jet, Mill, or Die Stamp. All axle uprights, motor brackets, guide tongues, body clip mounting holes, etc must be formed by stamping of the center section and pan(s). Spring steel solder together type chassis are not allowed. Chassis may not exceed 83 MM width at any point on the chassis.
A) May use lightweight replacement pans and center sections.
B) May interchange parts from a single manufacturer; such as Flexi and Flexi–‐2 parts, JK long or short center sections, and heavy or light pans on JK, Champion, Parma, Mossetti chassis.
C) No modifications except for the following:
D) May solder or glue motor, axle oilites/bushings, and front wheel retainers.
E) May add lead weight and/or strapping tape to chassis.
F) May file holes in motor bracket to allow better gear mesh, but must retain a portion of motor bracket.
G) No oilite/bushing modifications allowed. May use offset oilites/bushings. No Ball Bearings.
H) May add spacers between pan and center section.
I) May add a 1–‐inch (25.4 mm) long motor brace and a maximum of two upright braces (one for each upright).
J) The original manufacturer’s plating may be removed only in areas to be soldered.
K) May add pin tubes. Pin tubes must be in stock holes/location. Pin tubes may be either solid or floating. May add lead wire retainer.
L) May change stock bite bar diameter supplied by the MFG to a bar that is .062 maximum and .039 minimum diameter. The bar must be steel, straight, round, no bends, no flats and does not deviate from stock. May not solder bite bar to center section and/or pans.
M) Overall width maximum 83mm (3.268”)
N) May solder on steel guide tongue reinforcement but the original tongue may not be removed, modified, or moved.
O) No other–‐modifications, soldering, cutting grinding or bracing allowed.
P) May use any guide, nut, spacers, lead wire and clips. Only one guide flag per car. No Magnet Wire Allowed.
Q) May perform reasonable filing of rear oilite/bushing chassis holes to allow for axle alignment.
R) On the Mossetti chassis…Must use either unmodified .062” dia brass tube or the M-1052 .064” stainless tube only. Must use push/body pins to retain the bar in the chassis. The MR-1051 Chassis Retaining Clip may be used and can not be modified or soldered to the chassis.
S) Front axles and front wheels are not required. If racer chooses to use front wheels the min. diameter is .675″ o.d. Front axle minimum/maximum dia is .093/3/32″. Front axle may be soldered to center section uprights.
Note the following specs for each type of motor. Allowed modifications, trim the pinion shaft. Can may be “notched” on the axle side of the motor for slight axle clearance only. No other modifications of/to motor allowed.
May use clip on type heat sinks or screw on type heat sinks that screw to the can on the pinion side of the motor. Comm coolers allowed.
MOTOR SPECIFICATIONS for Pro Slot Speedball
No modifications except for the following: Motors must be factory sealed and using the unmodified factory seal only. Seals may have clear “finger nail polish” added to extend life of seal. NO other modifications to the seals allowed.
Racers may change brushes and springs on the Speedball motor only. Only 3 coil replacement springs are allowed. Any 36-D sized motor brushes may be used. Brushes may not be cut, slotted or modified on the surface touching the commutator. Brushes may be radiused prior to break in.
No spring insulation or shunt wires are allowed.
Super Glue may be added to the endbell bushing. Can oilite bushing may be soldered in place. Armature Shafts may be cut on both sides of the motor.
Motors may NOT be rebuilt.
May use clip on type heat sinks or screw on type heat sinks that screw to the can on the pinion side of the motor. Comm coolers allowed.
GEARS All classes will be 64 pitch only of any brand.
.
Any size/brand 64 pitch PLASTIC ONLY spur gear may be used and gear must clear track by .047″. No Metal Spur Gears Allowed.
REAR WHEELS/TIRES/AXLES
Black rear tires/rubber only. No dyed tires allowed. No Speed Rubber allowed.
Wheels/tires/rubber may not be wider than .815″ max width. Max hub dia is .625″.
Axles minimum 3/32″ dia. Drill blanks allowed. No hollow, non steel or light weight axles allowed. Axle flats for gear/tire set screws allowed.
FRONT WHEELS/AXLES Front wheels and tires are optional (except for JK Indy) and not required. If using front wheels: Min dia .675″ o.d. with rubber. Fronts do not have to touch the track surface.Minimum rubber/wheel width .250″
Front axle minimum/maximum dia is .093/3/32″. Axle may be soldered to chassis front uprights. Axle must be one piece, solid and steel. Wheel retainers may be soldered.
Car Width maximum 83mm.
CLEARANCE
Rear Clearance will be .047″ minimum including the spur gear. Clearance will be measured under the rear of the car, directly under the rear axle and between the rear wheels, with the car at rest on a flat tech block with the guide in the tech block slot.
Clearance will be checked at the beginning of the race, with no check at the end. If a car is suspected to be dragging on the track during racing, the race director, at his discretion may check clearance. Any car found to be dragging the track will be repaired during green flag racing conditions.
A mid race clearance check may be carried out by the tech director/race controller at the beginning of any heat of any race. Any car found with rear clearance less than .039” inches at the beginning of any heat will have to change tires and have the clearance rechecked under green flag racing conditions.
BODIES
Bodies must be fully painted and opaque. Sides may be left clear in the body pin/clips area only. Must have three numbers. All windows must be clear.
Bodies may have tape/lexan/mylar added for reinforcement but may not extend beyond the body.
No additional air control/spoilers/diaplanes may be added.
Body must completely cover chassis/tire when looking directly down on the car at tech except for the front chassis wings.
Blade portion of guide flag may extend past the front bumper/nose of body. No braid, clips or top of guide may be visible.
No cutting into the top surface of the body. The back of the body ( rear bumper/valance portion ) may be cut out/removed.
No rear body height requirement in any class.
We reserve the right to reject any body at tech that does not meet these requirements.
Front Wheel Area: Must use sticker fronts if no front wheels are used. If front wheels are used; front wheel openings must be either clear or cut out and 50% of the front wheels must be visible in the opening or clear area. No cutting into the top surface of the body.
No lightened drive train. This includes but not limited to: drilled, hollow or light weight axles, drilled hubs, drilled gears.
No ball bearings in chassis, wheels, axles.
Black rubber tires
Stickers or stock front wheels except for
JK Wide Indy.
Stock JK fronts or reasonable equivalent in JK Wide Indy.
Min Dia .680 min width .250
All other rules will conform to FNRS basic rules
*Please note:
Chassis components must be available at least 30 days before 1st season race. Chassis available after that date will be considered for the following season.
The 2024 season starts
Jan 13th at The Raceway, Cleveland TN
Chassis deadline is Dec 1st, 2023
We reserve the right to exclude any product that may be deemed detrimental to the series and or supporters/racers.
Classes to be run.
JK Wide Indy / LMP
DTM
GTP
MOTORS:
TS Intimidator
TS Intimidator BB
RTR Raptor Pro
PS Speedball
MA Enforcer
CLASS SPECIFICS
JK Wide Indy
JK Wide Indy Chassis C35 JK 251172
Minimum front wheel .680 dia x .250 width,
stock JK or reasonable likeness
11t pinion 64p (maximum)
Any tooth spur 64p
MOTOR:
TS Intimidator, TS Intimidator BB
RTR Raptor Pro
BODY:
JK Wide Indy
Kelly Evolution KE1841
Betta Honda from Project X
RTR Indy Dallara i18
4″ LMP
Same chassis as DTM and GTP
11t pinion 64p (maximum)
Any tooth spur 64p
MOTOR:
TS Intimidator, TS Intimidator BB
RTR Raptor Pro
MAP Enforcer
PS Speedball
Bodies
Any JK LMP
RTR Orca, both versions
Kelly Eagle
MA Toyota WEC traditional wing
4″ DTM
11t pinion 64p (maximum)
Any tooth spur 64p
MOTOR:
TS Intimidator, TS Intimidator BB
RTR Raptor Pro
MAP Enforcer
PS Speedball
BODY:
Any readily available DTM body.
EXCEPT: O/S or similar lower profile bodies. It must generally look like USRA and ISRA Production bodies.
RTR & Kelley both have acceptable options.
If you have a non mainstream body
(ie not available at distributors) please contact ahead of time for approval.
GTP
Pinion any tooth 64p
Spur Any tooth 64p
BODY:
RTR; Viking, Renegade, Warrior, Revolution
Kelly: Hawk, Falcon
O/S: B3 363
MOTOR:
Any listed above
We will close tech at 9:30
and start JK Indy or DTM qualifying if Indy is not being run.
Order for day
9:30 JK Indy
race immediately after.
DTM to follow
GTP to follow DTM.
OR
9:30 DTM
LMP
GTP
We will break for lunch as close to noon as makes sense between racing.
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OUR RULES ARE BASED ON THE FNRS
These are only here for reference
These are the FNRS rules as of the 2022 Flexi Palooza race at Pit Pass in Newport TN
STAMPED STEEL CHASSIS REGULATIONS
The FNRS requires all chassis and it’s components to be commercially available.
The chassis may have a minimum of two and maximum of three chassis parts. All chassis will consist of one solid center section and a maximum of two separate pans. Two piece center sections are not allowed. The portion of the center section to which the motor is attached must be steel. The pans may be steel or aluminum. No Home Made/Carbon Fiber/Plastic/Molded/Printed parts allowed.
The chassis blanks may be cut with a Laser, EDM, Water Jet, Mill, or Die Stamp. All axle uprights, motor brackets, guide tongues, body clip mounting holes, etc must be formed by stamping of the center section and pan(s). Spring steel solder together type chassis are not allowed. Chassis may not exceed 83 MM width at any point on the chassis.
The FNRS will approve chassis and chassis components for FNRS competition on a individual and yearly basis. Decisions will be made and announced by no later than July 1st for the upcoming calendar year. All chassis and chassis components will be approved at the discretion of the FNRS.
If any manufacturer who produces a current FNRS approved chassis or chassis components are found to be altering the chassis after the FNRS approval and/or found to not be supplying sufficient inventory.will be subject to removal off of the approved list.
*Please Note At this time no new chassis or components can be made legal until January 2022. Any new chassis manufactured between July 12, 2020 and July 1, 2021 will be reviewed for legality for the 2022 FNRS Series.If approved, they will become FNRS approved on Jan 1, 2022.
A) May use lightweight replacement pans and center sections.
B) May interchange parts from a single manufacturer; such as Flexi and Flexi–‐2 parts, JK long or short center sections, and heavy or light pans on JK, Champion, Parma, Mossetti chassis.
C) No modifications except for the following:
D) May solder or glue motor, axle oilites/bushings, and front wheel retainers.
E) May add lead weight and/or strapping tape to chassis.
F) May file holes in motor bracket to allow better gear mesh, but must retain a portion of motor bracket.
G) No oilite/bushing modifications allowed. May use offset oilites/bushings. No Ball Bearings.
H) May add spacers between pan and center section.
I) May add a 1–‐inch (25.4 mm) long motor brace and a maximum of two upright braces (one for each upright).
J) The original manufacturer’s plating may be removed only in areas to be soldered.
K) May add pin tubes. Pin tubes must be in stock holes/location. Pin tubes may be either solid or floating. May add lead wire retainer.
L) May change stock bite bar diameter supplied by the MFG to a bar that is .062 maximum and .039 minimum diameter. The bar must be steel, straight, round, no bends, no flats and does not deviate from stock. May not solder bite bar to center section and/or pans.
M) Overall width maximum 83mm (3.268”)
N) May solder on steel guide tongue reinforcement but the original tongue may not be removed, modified, or moved.
O) No other–‐modifications, soldering, cutting grinding or bracing allowed.
P) May use any guide, nut, spacers, lead wire and clips. Only one guide flag per car. No Magnet Wire Allowed.
Q) May perform reasonable filing of rear oilite/bushing chassis holes to allow for axle alignment.
R) On the Mossetti chassis…Must use either unmodified .062” dia brass tube or the M-1052 .064” stainless tube only. Must use push/body pins to retain the bar in the chassis. The MR-1051 Chassis Retaining Clip may be used and can not be modified or soldered to the chassis.
S) Front axles and front wheels are not required. If racer chooses to use front wheels the min. diameter is .675″ o.d. Front axle minimum/maximum dia is .093/3/32″. Front axle may be soldered to center section uprights.
STOCK CAR/DIRT LATE MODEL MOTOR SPECIFICATIONS
Optional motors for Local FNRS Racing Programs Mid America Retro Eagle, Eagle, Enforcer, Phoenix, Phoenix Supra, Pro Slot 4002FK/4007 Scorpion & JK Hawk 7/Retro Hawk.
Motors for Sanctioned Regional and National Events may be “hand out” motors and the FNRS will specify the selected motor and spec pinion size for those events. Note the following specs for each type of motor.
The JK and Mid America motors: Allowed modifications, trim the pinion shaft. No trimming of shaft on endbell side of motor. Can may be “notched” on the axle side of the motor for slight axle clearance only. No other modifications of/to motor allowed.
May use clip on type heat sinks or screw on type heat sinks that screw to the can on the pinion side of the motor. Comm coolers allowed.
MOTOR SPECIFICATIONS for Pro Slot 4002FK and 4007 Scorpion Motors
No modifications except for the following: Motors must be factory sealed and using the unmodified factory seal only. Seals may have clear “finger nail polish” added to extend life of seal. NO other modifications to the seals allowed.
Racers may change brushes and springs. Only 3 coil replacement springs are allowed. Any 36-D sized motor brushes may be used. Brushes may not be cut, slotted or modified on the surface touching the commutator. Brushes may be radiused prior to break in.
No spring insulation or shunt wires are allowed.
Super Glue may be added to the endbell bushing. Can oilite bushing may be soldered in place. Armature Shafts may be cut on both sides of the motor.
Motors may NOT be rebuilt.
May use clip on type heat sinks or screw on type heat sinks that screw to the can on the pinion side of the motor. Comm coolers allowed.
GEARS All classes will use “spec” pinion sizes and will be 64 pitch only of any brand.
Stock Cars using JK Retro Hawk/Hawk 7 or Mid America Retro Eagle/Eagle 11 tooth 64 pitch pinion only.
Pro Slot 4002FK or 4007 Scorpion 11 tooth 64 pitch pinion only.
Any size/brand 64 pitch PLASTIC ONLY spur gear may be used and gear must clear track by .047″. No Metal Spur Gears Allowed.
FNRS reserves the right to change the pinion specs based on different track size ( shorter or longer ), power/voltage, etc. If the pinion spec is to change for certain events, this will be announced in advance of the event.
REAR WHEELS/TIRES/AXLES
Black rear tires/rubber only. No dyed tires allowed. No Speed Rubber allowed.
Wheels/tires/rubber may not be wider than .815″ max width. Max wheel dia is .625″.
Axles minimum 3/32″ dia. Drill blanks allowed. No hollow, non steel or light weight axles allowed. Axle flats for gear/tire set screws allowed.
FRONT WHEELS/AXLES Front wheels and tires are optional and not required. If using front wheels: Min dia .675″ o.d. with rubber. Fronts do not have to touch the track surface.Minimum rubber/wheel width .275″
Front axle minimum/maximum dia is .093/3/32″. Axle may be soldered to chassis front uprights. Axle must be one piece, solid and steel. Wheel retainers may be soldered.
Rear Clearance will be .047″ minimum including the spur gear. Clearance will be measured under the rear of the car, directly under the rear axle and between the rear wheels, with the car at rest on a flat tech block with the guide in the tech block slot.
Clearance will be checked at the beginning of the race, with no check at the end. If a car is suspected to be dragging on the track during racing, the race director, at his discretion may check clearance. Any car found to be dragging the track will be repaired during green flag racing conditions.
A mid race clearance check may be carried out by the tech director/race controller at the beginning of any heat of any race. Any car found with rear clearance less than .039” inches at the beginning of any heat will have to change tires and have the clearance rechecked under green flag racing conditions.
BODIES
Bodies must be fully painted and opaque. Sides may be left clear in the body pin/clips area only. Must have three numbers.
Must have suitably painted 1/24 scale (with head, helmet, shoulders, torso, arms and steering wheel) 3-D, Full vacuum formed lexan driver/interior in the proper cockpit position.
Chassis or track may not be visible when looking through windows. All windows must be clear.
Bodies may have tape/lexan/mylar added for reinforcement.
No additional air control/spoilers/diaplanes may be added.
Body must completely cover chassis/tire when looking directly down on the car at tech except for the front chassis wings.
Blade portion of guide flag may extend past the front bumper/nose of body. No braid, clips or top of guide may be visible.
No cutting into the top surface of the body. The back of the body ( rear bumper/valance portion ) may be cut out/removed.
No rear body height requirement in any class.
FNRS reserves the right to reject any body at tech that does not meet these requirements.
Front Wheel Area: Must use sticker fronts if no front wheels are used. If front wheels are used; front wheel openings must be cut out and 80% of the front wheels must be visible in the opening or clear area. No cutting into the top surface of the body.
Stock Car Bodies that are commercially available and 4.5″ 1/24 scale style. COT bodies allowed. FNRS reserves the right to reject any body at tech that does not meet these requirements]