Tamiya TT-02 Chassis Bearing Sizes and Placement Guide

The Tamiya TT-02 is one of the most popular 1/10-scale touring car chassis ever produced. Its simple design, affordability, and wide range of available upgrades make it a favorite among beginners and experienced RC enthusiasts.

Whether you are assembling a new TT-02, refreshing a used chassis, or preparing for club racing, replacing the stock bushings with quality ball bearings is one of the best upgrades you can make.

At FastEddy Bearings, we supply complete model-specific TT-02 bearing kits with every chassis bearing required—no measuring or guesswork needed.

Why Upgrade the TT-02 to Ball Bearings?

Many standard TT-02 kits are supplied with plastic or metal bushings instead of precision ball bearings. Bushings are inexpensive and functional, but they create more friction and wear than quality bearings.

Upgrading to a complete FastEddy Bearings kit can provide:

• Smoother drivetrain operation
• Reduced rolling resistance
• Improved acceleration
• Longer battery runtime
• More consistent power delivery
• Less wear on gears and drivetrain parts
• Longer component life

How Many Bearings Does the TT-02 Use?

The standard Tamiya TT-02 touring-car chassis uses 16 chassis bearings:

• 8 × 5x10x4 mm
• 4 × 5x11x4 mm
• 4 × 8x12x3.5 mm

This bearing configuration applies to the standard TT-02 touring-car chassis. The TT-02B buggy and some specialized or modified versions may use different bearings.

Front Wheel Hubs

Each front steering upright uses two 5x10x4 mm bearings:

• One inner bearing
• One outer bearing
• Two bearings per front wheel
• Four front-wheel bearings total

These bearings support the front axles while handling steering loads, braking forces, cornering, and impacts.

Rear Wheel Hubs

Each rear hub carrier also uses two 5x10x4 mm bearings:

• One inner bearing
• One outer bearing
• Two bearings per rear wheel
• Four rear-wheel bearings total

These bearings support the rear axles while carrying acceleration and cornering loads.

Spur-Gear Assembly

The spur-gear assembly uses:

• 2 × 5x11x4 mm bearings

These bearings support the spur-gear shaft and help the center drivetrain rotate smoothly with less friction.

Propeller-Shaft Bevel-Pinion Supports

The front and rear bevel-pinion ends of the center propeller shaft use:

• 2 × 5x11x4 mm bearings

These bearings support the center drivetrain as power is transferred to the front and rear gearboxes.

Front Differential

The front differential uses:

• 2 × 8x12x3.5 mm bearings

These bearings support the front differential outdrives and allow the differential assembly to rotate smoothly under load.

Rear Differential

The rear differential also uses:

• 2 × 8x12x3.5 mm bearings

These bearings support the rear differential while handling acceleration and drivetrain loads.

Tamiya TT-02 Bearing Placement Chart

Location	Bearing Size	Quantity
Front wheel hubs	5x10x4 mm	4
Rear wheel hubs	5x10x4 mm	4
Spur-gear assembly	5x11x4 mm	2
Propeller-shaft bevel-pinion supports	5x11x4 mm	2
Front differential	8x12x3.5 mm	2
Rear differential	8x12x3.5 mm	2
Total		16

Why Choose a FastEddy Bearings TT-02 Kit?

A complete FastEddy Bearings kit includes all 16 chassis bearings needed for the standard TT-02 in one convenient package.

Benefits include:

• Complete model-specific bearing selection
• Correct sizes and quantities
• No measuring individual bearings
• No searching for several part numbers
• No guesswork required
• Consistent quality throughout the chassis
• Fast order processing and shipping

Whether you are assembling a brand-new TT-02 or rebuilding a well-used chassis, a FastEddy Bearings kit makes the upgrade simple.

When Should TT-02 Bearings Be Replaced?

Inspect or replace the bearings if you notice:

• Grinding or roughness
• Increased drivetrain noise
• Excessive wheel play
• Reduced acceleration
• Shorter battery runtime
• Loss of top speed
• Rust or corrosion
• Drivetrain vibration

Replacing worn bearings early can help protect gears, axles, differentials, and other drivetrain components.

TT-02 Bearing Maintenance Tips

• Blow dirt and dust off the chassis after every run.
• Avoid spraying bearings directly with high-pressure water.
• Inspect wheel bearings regularly.
• Clean and lubricate bearings after wet or dirty runs.
• Check differential bearings during routine maintenance.
• Replace bearings that remain rough after cleaning.

Frequently Asked Questions

Does every TT-02 use the same bearing kit?

No. This guide applies to the standard TT-02 touring-car chassis. The TT-02B buggy and some specialty versions or aftermarket conversions may use different bearings.

Is upgrading from bushings to bearings worth it?

Yes. Replacing the stock bushings with quality ball bearings is one of the most noticeable and useful upgrades available for the TT-02.

Should all 16 bearings be installed at once?

For a new build or complete rebuild, installing the full FastEddy Bearings kit at one time provides consistent performance throughout the drivetrain.

Final Thoughts

The Tamiya TT-02 is an affordable, versatile, and highly upgradeable touring-car chassis.

Installing a complete FastEddy Bearings kit replaces the stock bushings with precision ball bearings, reducing friction and helping improve drivetrain smoothness, acceleration, runtime, and reliability.

With every required chassis bearing included and no guesswork needed, FastEddy Bearings makes upgrading your TT-02 simple.