For countless R/C fans & practitioners, leaving a car or truck factory stock is simply not an option. Here we offer a collection of known hop-up parts available for the Mad Force. As the list grows, more categories will be formed. Note that this list only contains items that seem particularly useful or great-looking.
Replacement Parts List
Here's a great resource contributed by ntcmb, the complete Tower Hobbies parts listing for the Mad Force:
* Parts Listing for the Kyosho Mad Force 21 4WD on TowerHobbies.com *
This list will show you many of the Mad Force parts shared with other Kyosho vehicle platforms.
Suspension & Steering
| Pic | Part | Mfg'r | Features | Approx. Price |
Available from | Contributor |
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Aluminum steering cranks | Rix Gear | Reduces steering slop, increases smoothness with ball bearings | $26 | Rix Gear | The JANG |
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Front servo mount set w/ bumper | New Era | Another way to eliminate slop in the steering column. Moves the servo down to the axle, Clod Buster style. Includes aluminum bumper for protection, accepts dual shocks. | $70 | New Era Models | The JANG |
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Double shock stay | Kyosho | Allows mounting of dual shocks per wheel for increased dampening | $28 | Tower Hobbies | hua15 |
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Ultra soft springs | Kyosho | Helps remove bounce from the truck's ride characteristics for tackling rough terrain. | $16 | Tower Hobbies | hua15 |
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Special steering rod set | Kyosho | Increases durability, decreases steering slop | $13 | Tower Hobbies | hua15 |
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Aluminum Steering Crank | Kyosho | Decreases steering slop | $31 | Tower Hobbies, Hobby Etc. | hua15 |
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Titanium turnbuckles | Lunsford | Increased durability & reliability. Use: Two 2 1/4" X 3.5mm Super Duty (from knuckle to crank), 3 5/8" x 3.5mm Super Duty (links the 2 cranks), 4mm X 33mm for the rear knuckle | $9/pr. | Tower Hobbies | leetony |
Wheels & Tires
| Pic | Part | Mfg'r | Features | Approx. Price |
Available from | Contributor |
 |
JumboForce wheels | JPS | One-piece aluminum direct replacement rims allow you to run the amazing Imex JumboMaxx tires on your Mad Force! Click the link at right for pictures of these wheels installed on some show trucks. | $165 | RC4WD.com | hua15 |
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Aluminum wheels | JPS | CNC machined from a single block of aircraft-quality aluminum. Available in standard or 1" offsets. Eight designs available. | $149 | RC4WD.com | hua15 |
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Mega Force wheels | Kyosho | Direct replacement for stock wheels, adds ~1" to truck's width, nicer design | $15/pr | Tower Hobbies | The JANG |
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Monster Blazer wheels | OFNA | Fits Mad Force hubs, allows you to run IMEX JumboMaxx or OFNA Monster Pirate or Monster Blazer tires | $14/pr | Tower Hobbies | The JANG |
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V-Spike tires | Duratrax | Direct fit for Mad Force or Mega Force wheels. Provides increased traction. | $15/pr | Tower Hobbies | The JANG |
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Baja tires | IMEX | Direct fit for Mad Force or Mega Force wheels. | $15/pr | IMEX R/C | The JANG |
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Giant Trac tires | Pro-Line | Direct fit for Mad Force or Mega Force wheels. | $25/pr | Tower Hobbies | The JANG |
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Monster foam inserts | OFNA | Direct fit foam inserts for stock Mad Force wheels & tires | $14/pr | Tower Hobbies | The JANG |
Chassis & Structure
| Pic | Part | Mfg'r | Features | Approx. Price |
Available from | Contributor |
 |
Infinitely adjustable wheelie bar | R/C Alloys | Fully adjustable to any angle you want, rugged construction, longer than stock, with larger wheels. | $40 | R/C Alloys | R/C Alloys |
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Extended chassis kit | Kippster Racing | Improves weight distribution & balance, provides 15 shock mounting positions front & rear | $60 | Kippster Racing | The JANG |
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Center skid | New Era | Provides protection for the center drive & brake assembly | $20 | New Era Models | The JANG |
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Front bumper | New Era | Provides protection for the front axle against hard hits. | $40 | New Era Models | The JANG |
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Roll bar | New Era | Protection against damage to the engine, fuel tank & other components on bad roll-overs & upside-down landings | $45 | New Era Models | The JANG |
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Polished side plates | Kyosho | Trick look! | $37 | Tower Hobbies | hua15 |
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Polished under plate | Kyosho | Trick look! | $16 | Tower Hobbies | hua15 |
Engine, Exhaust & Drivetrain
| Pic | Part | Mfg'r | Features | Approx. Price |
Available from | Contributor |
 |
Monster Locker | Vertigo Performance |
Drop-in diff locker for maximum hill-climbing traction | $24.95 | Vertigo Performance | Vertigo |
| n/a | Joint cups, new Long version | Kyosho | Official answer to the popping driveshaft problem. | $10 ea | Tower Hobbies | n/a |
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Center shaft set | R/C Alloys | Dramatically stronger than stock units, also great looking. | $40 | R/C Alloys | The JANG |
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Special header & adapter | New Era | Improves exhaust flow dramatically, allowing increased power. Best when used with an upgraded muffler. | $40 | New Era Models | The JANG |
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TCD front gear set | Kyosho | Torsen-like diff action sends power to the wheel with traction. Note: Ineffective if your front wheels are not on the ground! TCD = Torsion Control Differential. | $125 | Tower Hobbies | hua15 |
| n/a | TCD rear gear set | Kyosho | Torsen-like diff action sends power to the wheel with traction. Note: Ineffective if your front wheels are not on the ground! TCD = Torsion Control Differential. | $125 | n/a | hua15 |
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Hardened diff gears | Kyosho | Increased durability for stock "LSD" diffs | $90 | Tower Hobbies | leetony |
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RB 063 tuned pipe | RB | Increased stock engine performance, dramatically reduced operating temperatures | $48 | Ace Hobbies | Nitromethane |
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Center universal driveshaft | Kyosho | Increased durability & reliability, shiny looks | $25 ea. | Tower Hobbies | Nitromethane |