Traxxas Ball Bearings Black Rubber Sealed 12x18x4mm Pair TRX5120A

Overview

The Traxxas Ball Bearings, Black Rubber Sealed (12x18x4mm) (2 pcs) TRX5120A are premium replacement bearings designed for RC enthusiasts who demand smooth, precise and reliable performance from their models. Whether you're a competitive racer pushing your RC car UK to its limits, or a weekend basher enjoying off-road adventures, these sealed ball bearings deliver the durability and low-friction rotation that keeps your RC truck or crawler running at peak efficiency. Traxxas has engineered these black-seal bearings as a step above their standard blue-seal counterparts, offering an even tighter seal that provides ultimate protection against dirt, moisture and contamination — essential when running your brushless RC short course truck or trail crawler in challenging outdoor conditions.

Black rubber-sealed ball bearings are the choice of serious RC hobbyists who refuse to compromise on component quality. They provide smooth, long-lasting and precise driving performance that translates directly into faster lap times, smoother handling and extended bearing life between maintenance intervals. The black-seal design creates a more aggressive barrier against environmental contaminants than blue seals, making these bearings the perfect upgrade for those running their ready to run RC models in dusty, muddy or wet environments. If you own a Traxxas Maxx Slash, Mini Maxx, Mini Rally, Mini Slash, Stampede, TRX-4 crawler series, XRT, WideMaxx, or X-Monster, these TRX5120A bearings are engineered to fit perfectly and restore your model to factory specifications or upgrade worn originals.

RC Model Shop stocks genuine Traxxas spare parts and upgrade components for all the major RC brands in the UK market. These ball bearings represent an essential maintenance item for any serious RC enthusiast, offering the kind of engineering precision that Traxxas is renowned for throughout the competitive RC hobby community.

Key Features

• Black Rubber Seal Design — The black rubber seal provides an even tighter barrier than standard blue seals, offering superior protection in dirty and muddy environments where your RC model encounters sand, dirt and moisture that can degrade bearing performance over time.
• Pair of Precision Ball Bearings — You receive two complete bearings in this pack, allowing you to replace both sides of an axle or suspension component in a single purchase, maintaining balanced performance across your RC car UK.
• 12x18x4mm Dimensions — These bearings are precisely engineered to fit the specific suspension and drivetrain locations on compatible Traxxas models, ensuring a perfect fit without modification or adjustment.
• Smooth and Low-Friction Rotation — Ball bearing construction ensures smooth, consistent rotation with minimal drag, translating to better handling response, improved acceleration and more predictable braking characteristics in your brushless RC truck or short course truck.
• Extended Bearing Life in Harsh Conditions — The sealed design dramatically reduces maintenance requirements compared to unsealed bearings, allowing you to spend more time driving and less time cleaning and servicing your RC model.
• OEM Traxxas Quality — As official Traxxas spare parts, these bearings meet the same stringent engineering and quality standards as components used in factory-built models, guaranteeing compatibility and performance.
• Wide Model Compatibility — These bearings fit numerous Traxxas platforms including the high-performance Maxx Slash 1/8 4WD 6S brushless short course truck in all colour variants, the Mini series including Mini Maxx BL-2S, Mini Rally VXL and Mini Slash BL-2S 4x4, plus larger models like the Stampede 4X4 HD VXL, TRX-4 trail crawler series, XRT VXL-8S, WideMaxx monster truck, and X-Monster chassis platforms.

Technical Performance

These 12x18x4mm ball bearings represent precision engineering at the component level, utilising hardened steel balls mounted within robust races and sealed with black rubber covers that create a protective barrier against the elements. The bearing construction eliminates play and wobbling in suspension and drivetrain components, which is critical for maintaining the tight tolerances necessary in high-performance RC short course trucks and crawlers. In the context of a complete Traxxas model — whether it's a 1/10 scale Stampede brushless monster truck, a 1/8 Maxx Slash 6S brushless short course truck, or a 1/10 TRX-4 trail crawler — these bearings contribute significantly to overall performance by reducing rotational friction and heat generation. The black rubber seal design extends bearing life in harsh RC environments where dust, sand and moisture would otherwise degrade unsealed bearings within a few hours of driving. Traxxas engineers specify these bearings for high-demand locations on their vehicles because the tight seal means less frequent maintenance, lower ownership costs, and more consistent performance session after session. The precision manufacturing tolerances ensure that these bearings maintain their performance characteristics whether installed on a fast-paced 4WD short course truck doing high-speed runs across rough terrain, or a technical trail crawler navigating rocky obstacles in ultra-low speed crawling conditions.

What's in the Box

• 2 x 12x18x4mm Black Rubber Sealed Ball Bearings

Frequently Asked Questions

• What is the difference between black-seal and blue-seal bearings for RC cars? — Black-seal bearings offer a tighter, more aggressive seal compared to blue-seal bearings, providing superior protection against dirt, dust and moisture contamination. This makes black-seal bearings the preferred choice for running in harsh environments, muddy tracks and sandy terrain. Whilst blue-seal bearings are suitable for normal conditions, black-seal bearings are specifically engineered for those pushing their RC models hard in demanding outdoor environments where extra protection against contaminants is essential.
• Are these bearings compatible with my Traxxas model? — The TRX5120A 12x18x4mm bearings are compatible with a comprehensive range of Traxxas models including the Maxx Slash 1/8 4WD 6S brushless short course truck, Mini Maxx BL-2S, Mini Rally VXL, Mini Slash BL-2S 4x4, Slash Ultimate 4x4 VXL, Stampede 4X4 HD VXL, entire TRX-4 trail crawler series, XRT VXL-8S and Ultimate, WideMaxx monster truck, and X-Monster chassis. Check your model documentation or contact RC Model Shop to confirm fitment if you're unsure.
• How often should I replace these bearings? — With proper maintenance including occasional cleaning and bearing oil application, black-seal bearings will provide thousands of miles of reliable service. However, if you notice grinding sounds, loose play in suspension components, or performance deterioration, it's time to replace them. The sealed design means they require far less frequent maintenance than unsealed bearings, making them more cost-effective over time.
• Can I use these bearings in a wet environment? — Yes, the black rubber seal design specifically provides enhanced protection in wet and muddy conditions. Whilst you should rinse your entire RC model with fresh water after running in wet conditions, the sealed bearing design significantly reduces water ingress compared to unsealed bearings, making black-seal bearings the smart choice for UK weather conditions and wet-weather running.
• What tools do I need to install these bearings? — Most Traxxas bearing locations can be accessed with basic RC tools including a screwdriver set and potentially a small hex key set depending on which suspension component you're servicing. A bearing press tool is useful but not always necessary for these smaller bearings, as they can often be carefully installed by hand with gentle pressure. Consult your Traxxas model manual for specific installation guidance.
• Are these genuine Traxxas parts? — Yes, the TRX5120A is an official Traxxas OEM spare part manufactured to the same specifications as original equipment. RC Model Shop is an authorised Traxxas retailer, guaranteeing that all parts you purchase are genuine, not counterfeit or imitation products.

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. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. 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 (12x18x4mm) (2 pcs) TRX5120A 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 visit us in Walsall — we look forward to helping you get the most out of your RC experience.