Tires
Tires are an important part of your car and have a great influence on its performance. Not only the wheels themselves, but their weight, diameter, and width should also be taken into consideration according to the type of course you are running.

See a complete list of current Mini 4WD Racing Tires and Wheels

Difference in Diameter
Small diameter: Good for a quick start, but not for top speed. Small diameter tires lower the center of gravity and help your car corner better.
Large diameter: Good top speed and suitable for long straights. Better shock absorption for bumpy course joints.

Difference in Width
Wide tires: Provides stability during cornering. Good for technical courses with up-hills, curves, and elevation changes.
Narrow tires: Good for straightway courses. Less drag on the motor and may have the advantage of longer run times. They provide less drain on the batteries.

Difference in Material
Rubber: Included in the kit. Weighs more than the sponge type, but useful for jumps and lowering the center of gravity.
Sponge: Weighs less than rubber, but with lower grip characteristics.
Reston: Lighter than the sponge type and better gripping. These can be used for all kinds of wheels.

Tire Maintenance
Use transparent tape to clean sponge type tires. Blue 3M masking tape for home painting works well too. Clean rubber type tires with an eraser and remove the eraser pieces with tape.

Wheels
Wheels, as well as tires, play an important role in tuning your car. There are various types with different diameters and structures. Select the right one for your application.
All of the different sized wheels can be used for the Super Mini 4WD series, however, if you have a Fully Cowled Mini 4WD, body modification will be required if you use anything other than the standard size wheels which fit under the body being used.

See a complete list of current Mini 4WD Racing Tires and Wheels

Types of Wheels
Small diameter type: Narrow Wheels (standard for the Fully Cowled Mini 4WD), Wide Super Low-Height Wheels, Wheels for semi-pneumatic tires.
Large diameter type: Included in a Super Mini 4WD, Pro and REV snap together kits. Lots of designs are available.
One Way type: Light One Way Wheels, Wide One Way Wheels, Low-Height One Way Wheels, Narrow One Way Wheels (exclusive for the Fully Cowled Mini 4WD).

Normal Wheels vs One-Way Wheels
Normal: The speed of the wheels at both sides of a car is the same. This is good for the straights, however the outer wheel tends to be dragged during cornering and this may slow your car down.
One Way: The outer wheel rotates faster than the inner wheel does. This ensures smooth cornering and is preferred for technical courses with many curves.

Rollers
Rollers are a must when racing on walled circuits. They help your car negotiate corners smoothly. Key points in using rollers are their size, location, and angle.

See a complete list of current Mini 4WD Racing Performance Parts

Handling Settings by Roller Size
Same size: Standard setting. Front and rear rollers have the same diameter. This makes your car easier to run straight since rollers are lined parallel when they contact a wall. Also minimizes power loss.
Bigger in front: Front roller diameter is bigger than that of rear roller. Suitable for courses with many corners since this pushes your car towards the inside of the course when rollers contact a wall.
Smaller in front: Rear roller diameter is bigger than that of front roller. This makes your car run along with a wall. Gives stability during cornering, but creates power loss.