Upgrade Parts

JR Basic Tune Up Parts, for MA Chassis

This invaluable spacer set features spacers of 5 different thicknesses, allowing you to make pinpoint setup changes to your Mini 4WD machine.   Fe...

This durable FRP front stay needs no body modifications when being fitted to any fully-cowled Mini 4WD machine. This is a great upgrade part that e...

Give your Mini 4WD machine the power to adapt to a wide range of course styles and layouts! This sliding damper allows more stable running as it ab...

These lightweight yet tough 19mm aluminum rollers feature inbuilt 520 bearings to provide your machine with smooth movement. In addition, these rol...

As a part of the Grade Up Parts line-up, this tape can be used at official Mini 4WD races and events. As the name suggests, this tape can be used f...

This Brake Set designed for the AR Chassis includes a brake plate, adapters, two kinds of brake sponges, and 3 types of spacers. By using the adapt...

This set conveniently includes gears that are compatible with AR chassis Mini 4WD machines, allowing you to adjust the gear ratios of your machine ...

This FRP plate is specially designed for the Mini 4WD AR chassis and features holes to enable the installation of 9mm, 11mm, 13mm, 17mm, and 19mm r...

This basic Tune-Up parts set includes fundamental Mini 4WD tuning options that you can use for your AR Chassis. The set includes mass dampers, fron...

JR Brake Sponge Set, 3 Types

This Basic Tune-Up Set is intended for novice Mini 4WD users and conveniently includes parts for fundamental modifications which are recommended by...

This gear set provides Mini 4WD racers with another setting option. It will give your machine a gear ratio of 3.7:1, which is faster than High-Spee...

JR Super Speed Gear Set, for Super X & Super-Li Chassis

These 620 sized Fluorine Coated Steel Bearings for wheel axle use are an excellent way to upgrade your machine. They offer excellent qualities such...

JR PRO Low Friction Roller Set

Made for the advanced Mini 4WD racer, this high-performance Mini 4WD PRO motor really shines on winding, twisting circuits and features silver carb...

Set offers gold plated terminal connectors that are rust-resistant and highly conductive of electricity. These terminals stand up well to the rigor...

JR PRO Gear Bearing Set, for PRO MS Chassis

JR DR 11mm Ball Bearings (2pcs)

These high-grade ball bearings assure smoother wheel movement for overall faster performance. One side of the ball bearing hold is made of transpar...

Center race of the ball bearing is round. Used in gear box. Provides smooth motor rotation.

Includes a pair of metal poles with plastic ball heads. When a car becomes unstable during cornering, the ball heads contact a circuit wall assurin...

This is a handy set of hex shafts that are useful replacement parts to the Super X and Super XX Mini 4WD chassis.Features:2x72mm Hex Shafts x10Comp...

These are spare Mini 4WD gears. They are handy because they are useful for those who find that tuning up their Mini 4WD car takes its toll on their...

This set includes 4 shaft stoppers for use on Mini 4WD machine axles, enabling you to attach your wheels to 72mm hex shafts with precision. They ar...

This set of spare parts includes 2 types of springs which were a part of Items 15139 and 15198. This item can be used to adjust the performance of ...