Compatible RC Parts for: Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)

Fits the Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221).

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Compatibility is verified using the exact model information shown here.

Verified Model Information

Brand
Kyosho
Exact model
Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)
OEM model
31221
Scale
1:8
Power/fuel type
Nitro & Glow Fuel
Vehicle type
1/8 Nitro GP 4WD Monster Truck
Chassis/platform
Kyosho Mad Force ladder-frame chassis (31221)
Terrain
Off-Road: Dirt, Grass & Rough Terrain
Production era
Modern Transition (2000-2009)

Pick Your Compatible Kit

Choose from the verified kit options available for this exact model:

Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)OEM model: 31221

STAINLESS RCScrewZ Stainless Steel Screw Kit kyo005 for Kyosho Mad Force 1/8 Nitro GP 4WD Monster Truck (31221) | SET

Stainless Screw Kit

RCScrewZ Stainless Screw Kit

SKU: kyo005

Corrosion-resistant model-specific replacement hardware.

Choose this kit when you want stainless replacement screws for this exact model.

Pieces in kit: 280+ Pieces

Verified fit for:

Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)

OEM model: 31221

$43.95$38.94

Available

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RUBBER RCScrewZ Rubber Shielded Bearing Kit kyo005r for Kyosho Mad Force 1/8 Nitro GP 4WD Monster Truck (31221) | SET

Rubber-Sealed Bearing Kit

RCScrewZ Rubber-Sealed Bearing Kit

SKU: kyo005r

Preferred for off-road, dusty, wet, and sealed-use conditions.

Choose this kit for rougher running conditions where sealed bearings are the priority.

Verified fit for:

Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)

OEM model: 31221

$59.95$53.67

Available

View Kit Details
METAL RCScrewZ Metal Shielded Bearing Kit kyo005b for Kyosho Mad Force 1/8 Nitro GP 4WD Monster Truck (31221) | SET

Metal-Shielded Bearing Kit

RCScrewZ Metal-Shielded Bearing Kit

SKU: kyo005b

Preferred for cleaner conditions and lower-drag priorities.

Choose this kit for cleaner running conditions and lower-drag priorities.

Verified fit for:

Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)

OEM model: 31221

$59.95$53.67

Available

View Kit Details

All Compatible Products

The listings below show the same verified kit roles with current pricing and links to full product details.

Explore Other Kyosho Models

These links open other exact Kyosho Model Collections. Confirm your vehicle’s model or OEM number before choosing a kit.

MODEL-SPECIFIC HELP

Questions About This RC Model?

Answers for the verified kit options available for Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221). Confirm the OEM/model number before ordering.

How do I confirm these kits fit Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221)?
Confirm the OEM/model number 31221 on your RC vehicle, box, manual, or parts diagram. This Model Collection lists the verified RCScrewZ Stainless Screw Kit, Rubber-Sealed Bearing Kit, and Metal-Shielded Bearing Kit assigned to Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221). A similar model name, body, scale, or chassis, is not enough to confirm fitment.
What is included—and not included—in the Stainless Screw Kit?
The model-specific RCScrewZ Stainless Screw Kit includes the stainless screws selected for common assembly locations on Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221), plus matching nuts and washers where required, extra common sizes, Bondhus short-arm hex wrenches, and a reusable storage case. Exact counts and sizes vary by kit. It does not include electronics, shocks, motors, engines, bearings, or molded plastic parts.
What is included in the RCScrewZ Bearing Kits?
Each model-specific bearing kit contains the bearing sizes assigned to Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221), along with spare bearings and a reusable storage case. Depending on the model, a kit may include standard, flanged, one-way, or thrust bearings.
Should I choose Rubber-Sealed or Metal-Shielded Bearings?
Choose Rubber-Sealed bearings for off-road use, dust, dirt, sand, mud, and lower-maintenance protection. Choose Metal-Shielded bearings for cleaner on-road or prepared surfaces when lower drag is the priority. Both kits are model-specific for Kyosho Mad Force 1/8 Nitro 4WD Monster Truck (31221); the difference is the shield type and intended operating environment.
How do RC Pro Club rewards work?
RC Pro Club is the J-M SUPPLIES RC Parts Store rewards program. Eligible purchases earn points that can be redeemed for available rewards under the current program terms. Rewards and redemption values can change, so review the RC Pro Club page for the latest details before ordering.

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