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2018 Tire Rules

No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed. Tire sniffing –sample testing or confiscation of tires may happen nightly or randomly at the Race Directors discretion.

UMP Late Model:

Right Front, Left Front & Left Rear Tires: Hoosier L/M 20 ONLY! — Grooving & Siping Allowed
Right Rear Tire: Hoosier L/M 40 ONLY! — Grooving & Siping Allowed
L/M 20 – Must Durometer 40 minimum before race
L/M 40 – Must Durometer 60 minimum before race
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion.

 

UMP Modified:
Right Front, Left Front & Left Rear Tires: Hoosier E-Mod 26.5 or 27.5 “M30S” ONLY!
Right Rear Tire: Hoosier E-Mod 26.5/8.0/15 or 27.5/8.0/15  “M30S or M60 ” ONLY!
No Grooving Allowed! Siping permitted on M30S & M60 tires.
Maximum width of tire will be 9 inches.
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed. No defacing or altering any of the manufacturer’s identification markings, letters, words, numbers on any tire.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion. Officials may confiscate any tire at any time to be evaluated and analyzed including verification using a tire durometer. Tire samples may also be submitted for further chemical analysis.

Bead locks on Right Side ONLY!
Wheel discs shall be fastened to the wheel using a minimum or three (3) – 5/16 inch or three (3) 1/4 inch diameter magnetic steel hex head bolts!
As an option, a wheel cover with minimum (5) five steel Zeus fasteners mounting points may be approved.
The use of Wheel discs with any other type of fastener will not be permitted.
Only 8-inch DIRTcar approved and labeled racing wheels will be permitted. Wheels must not weigh over 30 pounds.
All wheels must be conventional one-piece magnetic steel and must be mounted with lug nuts. Aluminum, plastic, and/or carbon fiber wheels will not be permitted. All wheels must be fastened to the hub with (5) five lugnuts.

UMP Pro Modified:
Hoosier E-Mod 26.5 or 27.5 “M30S, A40S, H40 & M60” Compound ONLY!
M30S & M60 only on the rear!
M30S, M60, A40S & H40 tires may be used on the front.
M30 & M60 tires can be siped but no grooving allowed. A40S & H40 may be siped & grooved.
Maximum width of tire will be 9 inches.
E-Mod “A40S” – Must durometer 50 minimum before race
E-Mod “H40” – Must durometer 60 minimum before race
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion.

Bead locks on Right Side ONLY!
Wheel discs shall be fastened to the wheel using a minimum or three (3) – 5/16 inch or three (3) 1/4 inch diameter magnetic steel hex head bolts!
As an option, a wheel disc mounted with a minimum of five (5) Zeus fasteners may be used.
The use of Wheel discs with any other type of fastener will not be permitted.

AARA/UMP Sportsman :
Hoosier E-Mod 26.5 or 27.5 “A40, A40S, M30S, H40 & M60” Compound
Siping & Grooving Will Be Allowed on ALL tires!
E-Mod “A40” – Must durometer 45 minimum before race
E-Mod “A40S” – Must durometer 50 minimum before race
E-Mod “H40” – Must durometer 60 minimum before race
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion.

AARA PureStock/UMP Factory Stock:
OEM Passenger Car Tires only No Low Profile Tires or
Hoosier E-Mod 26.5 or 27.5 “A40 or H40” Compound
Siping & Grooving Will Be Allowed!
E-Mod “A” – Must durometer 45 minimum before race
E-Mod “A40S” – Must durometer 50 minimum before race
E-Mod “H” – Must durometer 60 minimum before race
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion.

Pro 4 Stock/ UMP Sport Compact:
OEM Passenger Car Tires only No Low Profile Tires
No Grooving or Siping Allowed
Must Maintain 30lbs Air Pressure Minimum At All Times!
No treated tires/ tire prep/soaking /solicitation of tire preps/ possession of tire preps allowed.
Tire sniffing –sample testing or confiscation of tires will be at the Race Directors discretion.

TIRES IN ALL CLASSES SUBJECT TO INSPECTION AT ANYTIME!
NO SOFTENING OR CHEMICAL ALTERING ALLOWED!

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