Traxxas Ball Bearings Black Rubber Sealed 15x21x4mm Pair TRX5102A

Overview

The Traxxas Ball Bearings, Black Rubber Sealed (15x21x4mm) (2 pcs) TRX5102A are essential replacement parts for maintaining peak performance in your RC crawler or off-road vehicle. These precision-engineered bearings are designed to deliver smooth, long-lasting and precise driving characteristics that serious RC enthusiasts demand. Whether you're running a Traxxas TRX-4, TRX-6 or other compatible RC model, these rubber-sealed ball bearings provide the durability and reliability needed for consistent performance across all terrain types.

Rubber-sealed ball bearings offer superior protection compared to open bearings, making them the ultimate choice for off-road RC driving in dirt environments. The sealed design keeps contaminants, mud and moisture away from the bearing races, ensuring your RC car maintains smooth operation even after challenging adventures in woodland trails, muddy terrain or dusty conditions. For RC car UK enthusiasts who demand reliability from their vehicles, sealed bearings are a critical maintenance item that extends the lifespan of your drivetrain components and preserves that premium handling feel that makes RC driving so rewarding.

This pack contains two bearings, which is the standard configuration for many RC applications. If you're building, maintaining or repairing your ready to run RC crawler or custom-built machine, having quality replacement bearings on hand is essential. Traxxas is recognised as a leader in RC manufacturing, and their genuine replacement parts ensure compatibility and performance that matches the original specifications of your vehicle.

Key Features

• Rubber-sealed design — The dual rubber seals protect the bearing races from dirt, dust, mud and moisture that accumulate during off-road driving, which means your bearings will spin freely for longer and resist rust and corrosion that can compromise performance.
• Precision ball bearing construction — These are genuine Traxxas precision bearings with high-quality ball races that maintain smooth, low-friction rotation, delivering the kind of responsive handling that makes RC driving enjoyable on every run.
• 15x21x4mm specification — These bearings are engineered to precise dimensions that fit specific RC models without modification, ensuring they perform exactly as the manufacturer intended without compromise.
• Pair pack (2 pcs) — This pack includes two bearings, which is the standard replacement quantity for most RC applications, allowing you to service both sides of an axle or suspension component in one purchase.
• Long-lasting durability — Rubber-sealed bearings provide exceptional protection in dirt environments, making them ideal for serious RC hobbyists who run their vehicles in challenging outdoor conditions rather than on smooth indoor tracks.
• Genuine Traxxas part — As an official Traxxas replacement component, these bearings are manufactured to exact OEM specifications and are fully compatible with Traxxas RC models including the TRX-4 and TRX-6 ranges.

Technical Performance

The Traxxas Ball Bearings TRX5102A are engineered with precision ball bearing races that minimise friction and maximise rotational efficiency. The rubber seals provide a critical barrier against the ingress of dirt and moisture that would otherwise degrade bearing performance over time. These 15x21x4mm bearings are suitable for multiple Traxxas RC crawler and trail truck applications, making them a versatile spare part for any RC enthusiast's workshop. The construction quality reflects Traxxas's commitment to durability and performance—these are not budget alternatives but genuine components engineered to last through countless hours of RC driving. The sealed design is particularly important for off-road use where exposure to mud, water and dust is inevitable. Unlike open bearings that require frequent cleaning and re-greasing, sealed bearings maintain their performance characteristics with minimal maintenance, making them practical and cost-effective for regular RC use.

What's in the Box

• Traxxas Ball Bearings, Black Rubber Sealed (15x21x4mm) — 2 pieces

Compatibility

These bearings are compatible with a wide range of Traxxas RC models, including:

• Traxxas TRX-4 Chevrolet K10 Cheyenne High Trail Edition (all colour variants)
• Traxxas TRX-4 Ford F-150 Ranger XLT High Trail Edition
• Traxxas TRX-4 1972 Chevrolet K5 Blazer High Trail Edition
• Traxxas TRX-4 1979 Chevy Blazer (Clipless Body)
• Traxxas TRX-4 Sport and TRX-4 Sport High Trail Edition
• Traxxas TRX-4 Unassembled Chassis Kit
• Traxxas 1/10 TRX-4 Nissan Pathfinder SE-V6 3S
• Traxxas TRX-6 Mercedes-Benz G 63 AMG XL-5
• Traxxas TRX-6 Ultimate RC Hauler with Winch
• Traxxas UDR Unlimited Desert Racer Pro-Scale 4WD RTR Short Course Truck

Frequently Asked Questions

• Why are rubber-sealed bearings better for off-road RC cars? — Rubber seals create a protective barrier that prevents dirt, mud and moisture from entering the bearing races. This is critical for RC vehicles driven in challenging terrain because without seals, contaminants would cause friction and corrosion that destroys bearing performance. Sealed bearings maintain smooth operation in conditions that would quickly ruin open bearings, making them essential for serious off-road RC driving.
• How often should I replace my RC bearings? — With rubber-sealed bearings, replacement frequency depends on usage conditions. Bearings used primarily indoors may last many months or even years, but bearings exposed to muddy or wet conditions may need replacement every few months. Signs that replacement is needed include grinding sounds, rough rotation or visible damage to the seals. These TRX5102A bearings are affordable to replace and are worth keeping in stock for regular maintenance.
• Are these bearings suitable for high-speed RC vehicles? — Yes, these are precision ball bearings designed for smooth, efficient rotation. However, they are specification-matched to specific RC models—check your vehicle's manual to confirm these dimensions (15x21x4mm) are correct for your application before purchasing. Using the correct bearing specification ensures optimal performance and reliability.
• What is the difference between sealed and open bearings for RC cars? — Open bearings offer slightly less friction but require frequent cleaning and re-greasing, especially in dirty conditions. Sealed bearings sacrifice minimal performance while gaining substantial protection and reduced maintenance. For off-road RC use, sealed bearings are the clear choice because they maintain consistent performance without constant service.
• Can I use these bearings on any RC vehicle? — No, bearing compatibility depends on exact dimensions and internal specifications. These TRX5102A bearings are engineered for specific Traxxas models as listed in the compatibility section. Before purchasing, verify that your RC vehicle requires 15x21x4mm bearings by checking your user manual or consulting with an RC specialist.
• Do these bearings require any special installation? — These are standard ball bearings that install using normal RC tools and techniques. They press-fit into bearing blocks using standard bearing pullers and installers. If you're unfamiliar with bearing replacement, consult your vehicle's assembly manual or ask the team at your local RC shop for guidance.

Why Buy from RC Model Shop?

RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the Traxxas Ball Bearings, Black Rubber Sealed (15x21x4mm) (2 pcs) TRX5102A today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or contact us — we look forward to helping you get the most out of your RC experience.