Build your custom chopper

Custom-Built Choppers in Illinois

Below you will find some basic information about the building blocks that we use to build each and every custom chopper at Mad Fox Choppers. There are many optional components that you can select from to suit the needs of your particular custom chopper build.

Mad Fox Choppers Custom Pro-Street Chopper

Custom Built Motorcycles


  • Soft tail style frame for 300mm tire
  • 1.5 inch tubing
  • 40 degree rake
  • -2" up stretch
  • 5" back bone stretch
  • 2" down tube
  • 1.75" back bone
  • Hidden dual 4" shock system - fully adjustable for raising and lowering bike
  • Shock comes in Chrome or Black
Custom Chopper Frames


Ultima EPA Certified 107 C.I. Ultima El Bruto Series 113 C.I.
Bore: 4.000" Bore: 4.000"
Stroke: 4.250" Stroke: 4.500"
Piston: Forged Dome Piston: Forged Dome
Compression: 9.6:1 Compression: 10.2:1
Valve Spring: Ultima® Rated Output: 120 RW HP
Chrome Nose Cone/Rocker Boxes 120 LB FT Torque
Billet Oil Pump Camshaft: 0.640" Lift; 264 Duration
Chrome Tappet Blocks Valve Spring: Ultima
Single-fire Ignition Chrome Nose Cone/Rocker Boxes
Includes 45mm Mikuni Carb. Billet Oil Pump
2 Year/24,000 Mile Limited Warranty Chrome Tappet Blocks
*Included in basic build* Single Fire Ignition
Includes 45mm Mikuni Carb.
12 mo/12,000 Mile Limited Warranty
*Available at additional cost*
All engines available in Black, Natural or Polished

For more information on the Ultima Engines, click here

Custom Chopper Engines


  • 6-speed rsd transmission
  • cable operated(ultima)
  • Heavy Duty 2 Year 20,000 mile warranty

   Rims and Tires:

  • Front Wheel (you pick the style rim) 21 x 3.25 with 120 x 70 Avon Venom tire
  • Rear Wheel (you pick the style rim) 18 x 10.5 with 300 series Avon Venom tire
  • Matching pulley 65 tooth x 1.5" wide and one piece rotor

   Custom Paint/Basic Artwork:

  • Custom Paint colors, Kandy Colors and Custom Airbrushing available at additional cost.  Visit our Chopper Paint Shop to learn more
Custom Chopper Paint


  • Ultima primary belt drives polished street style
  • 3.35" Goodyear belt
  • Extra plate Barnett clutch assembly
  • Ultima thunder fire heavy duty starter (chrome or black)
  • Wild Rider 32 amp charging system
  • Chrome forward controls with matching grips and folding passenger pegs
  • Steel braided fuel and oil lines with chrome finishing caps
  • Steel braided clear coated brake lines (dot 5 fluid)
  • Custom air filter assembly (chrome)
  • Thunder Volt AGM Battery (270 cca)
  • Thunder head wiring system
  • Chrome fuel and oil filters
  • Chrome kickstand
  • 7" Stretched headlight
  • LED rear turn signals
  • LED front turn signals mounted to forks
  • Custom shift linkage
  • chrome fuel valve
  • chrome horn
  • custom chrome mirrors (you pick style)
  • 1.25" drag style handle bars (10" riser with 1" pull back)
  • head mounted digital speedometer

   Front Fender:

  • Custom round top fender for 21" wheel
Custom Motorcycle fender paint


  • Solo Shootout w/flared back (black vinyl) gel or leather extra
Custom Pro-Street Chopper

   Front End:

  • Custom Ultima 41mm chrome billet fork slider assembly +2" over stock
  • Styles are smooth, milled or bullet hidden axle
  • Custom triple tree 41mm with 6 degree rake

   Oil Tank:



  • Front and Rear calipers polished billet aluminum
  • JayBrake 4 piston calipers

   License Plate:

  • Chrome billet license plate frame w/LED Tail Light (you pick style)


  • Customer is responsible for shipping. Shipping cost is about $600 to $1300
  • Mad Fox Choppers will assist in loading the chopper with the shipping company


  • 60% is due before production on your chopper begins
  • Remaining balance is due before chopper is shipped
  • We accept Visa, Mastercard, Discover, Checks or Money Orders
  • Production on the bike will begin once funds have cleared your account
  • When bike is complete, remaining balance is due within 2 weeks. After that time, 25$/day storage fees will accrue.