PRO EXTREME MOTORCYCLE Class Rules
(1) Turbos will be allowed in PXM in
2018 along with our Nitrous Entries
(2) Turbos allowed with mechanical
injection may not be larger than 65 mm
(3) EFI Turbos may not be larger
(4) Any Turbos running alcohol can
not run an intercooler
(5) Any Turbos running gas may run
(6) Only 1 power adder allowed
(7) V-Twin Turbo Harleys allowed and
may also use nitrous
(8) V-Twin Turbo Harleys may not
exceed 122cc with 2 power adders
(9) V- Twin Turbo Harleys may not
exceed 160cc with 1 power adder
(10) All Turbo bikes must weigh 700
lbs after run with rider
(11) All Turbo bikes will run no
larger than a 11 inch tire, same as
(12) All other rules listed under
PDRA PXM apply
(13) Race Director has the option to
change or modify rules at any time to
maintain parity in the class
Pro Extreme Motorcycle or PXM followed by bike number. Numbers
must be at least 3 tall and on both
sides of body or wheelie bars panels.
FIELD: 16 bike qualified field.
PDRA Logo Decal and Class Sponsor
Decal Required on both sides of
vehicle where they are visible.
Alternates receive ONLY 25 entry
Minimum weight at conclusion of run,
including rider 625 lbs (595 lbs for
any late model Hayabusa or ZX-14
Motorcycle entries with 50 inches or
less from centerline of crankshaft to
centerline of rear wheel, must be
stock stroke weight 595 lbs.
All rules subject to change at the
sole discretion of the PDRA Technical
REQUIREMENTS AND SPECIFICATIONS BODY
APPEARANCE: All bikes must be
professionally finished, painted,
lettered, numbered and decaled.
BODY: One piece body representing
original manufacturers design. Full
fairing, half fairing, headlight
BATTERY: Must be securely fastened
within the frame parameter.
BRAKES: Front single 10 rotor or dual
8 rotors. Rear single 10 rotor. Must
be fully operational when applied.
FRAME: All Frame components except
bracing and brackets should be
constructed using a minimum of 1.00 x
.058 4130 chromemoly tubing unless
the design has been submitted to the
PDRA technical services department for
approval prior to construction. This
includes both upper and lower
framerails back to the axle block as
well as the box between the engine and
the rear tire.
GROUND CLEARANCE: Minimum 2 ground
clearance with rider seated on the
bike and no more than 10 lbs rear tire
TIRES: Maximum tire width, regardless
of temperature or wear, not to exceed
11 as measured with motorcycle off of
the ground at 8 lbs of air pressure.
Manufacturer, model and size
information must be clearly
WHEEL BASE: Maximum wheelbase of 90,
Minimum wheelbase of 50.
WHEELIE BARS: Required. Non-metallic
WHEELS: Beadlock style rear wheel
required. A flat shield must be
incorporated into the front wheel and
painted flat black. This shield should
extend to at least 5 ½ above the
DRIVELINE AND ENGINE
CHAIN GUARD: Must cover entire length
and width of drive chain. Extended
chain guard recommended.
FUEL: Gasoline allowed. Nitromethane is
INDUCTION: Mechanical fuel injection,
electronic fuel injection or
MAXIMUM ENGINE DISPLACEMENT: 1850 cc
for inline 4 cylinders, 2640 cc
maximum for V-Twins.
Shifters Are Allowed.
All removable multi-piece exhaust
collectors/stacks must be securely
fastened with either an NHRA-accepted
header tether, a minimum ½
(half-inch) stitch weld located on
each primary tube or be permanently
attached to the vehicle body or frame
with positive fasteners (i.e. exhaust
hangers, support brackets, bolts/nuts,
etc.) such that they require tools for
CREDENTIALS: A valid competition
license is required.
A valid NHRA or IHRA competition
license will be accepted and may be
transferred when presented with a
When an event is contest at an NHRA
Member track only PDRA or NHRA
competition licenses will be accepted.
DATA AND ELECTRONICS ACQUISITION:
PUSH VEHICLES: Allowed. A valid
drivers license is required to
operate any type of push vehicle.
Posted pit speeds must be obeyed at
all times. If pit speed is not posted,
maximum pit speed will be 5 mph.
CARBURETORS AND THROTTLE BODIES:
Carburetor restraint / backfire strap
ENGINE CONTAINMENT SYSTEM: PDRA
accepted engine containment system
FIRE SYSTEM: Minimum .5 lb PDRA
accepted fire suppression system
FUEL LINES: Must use AN fitting or be
fastened using metal clamp or tie
HELMET: SN-2010 or newer, SFI 31.2 or
41.2 required. Use
of open face helmet prohibited. Eject
Helmet Removal System (Part # SDR
890-01-30) or equivalent required.
KILL SWITCH: Required. Must be
installed so that the rider can
activate with both hands on the handle
bars. Must use ignition cut-off switch
securely attached to rider. Ignition,
fuel pump and solenoids must
deactivate. Lanyards must be
constructed of leather, metal or
nylon. Plastic lanyards prohibited.
OIL CATCH CAN: Required.
PROTECTIVE CLOTHING: Full leather suit
required. If suit is two-piece it must
attach using a full circumference
zipper. The use of Synthetic suits are
strictly prohibited. Full leather
motorcycle boots required. Driving
shoes prohibited. Boots must cover
entire ankle. Full leather gloves
STEERING DAMPER: Required.
BE SURE TO ALSO VIEW OUR "OVERALL / GENERAL SERIES RULES"