- Bearing Size: 5x10mm
- Pack Type: Pair of Bearings (2)
- Bearing Type: Shielded Ball Bearing
- Manufacturer: Losi
- Part Number: Z-LOSA6937
- EAN: 605482138083
- Compatible with Losi 1/4 Promoto-MX Motorcycle RTR with Battery and Charger (C-LOS06002)
- Compatible with Losi 1/4 Promoto-MX Motorcycle RTR Club MX Blue (C-LOS06000T2)
- Compatible with Losi 1/4 Promoto-MX Motorcycle RTR FXR Red (C-LOS06000T1)
Overview
The Losi 5x10mm Shielded Ball Bearings (2) Z-LOSA6937 are precision replacement bearings designed for RC enthusiasts who demand reliability and smooth performance from their vehicles. Whether you're maintaining your Losi 1/4 Promoto-MX motorcycle or upgrading another RC model, these genuine OEM bearings offer the exact fit and quality you need to keep your RC car UK-legal and competition-ready. Shielded ball bearings are essential components in modern RC vehicles, providing low-friction rotation for wheels, transmissions, and drive systems whilst protecting internal components from dirt, dust and moisture.
As a critical wear item in any RC model, ball bearings require periodic replacement to maintain peak performance and prevent mechanical failure. The shielded design of these Losi bearings offers superior protection compared to unsealed alternatives, making them ideal for outdoor bashing, track racing, and long-term reliability. If you've noticed grinding sounds, resistance during free-wheeling, or sluggish handling in your Losi RC model, worn bearings are often the culprit—and these genuine Losi replacements restore your vehicle to factory specifications instantly.
RC enthusiasts across the UK trust Losi bearing kits because they're engineered to the same tolerances and quality standards as the original bearings that came with your vehicle. These 5x10mm shielded bearings come as a pair, giving you everything needed to service both sides of an axle or suspension component. Whether you're a weekend basher pushing your RC through rough terrain, a competitor preparing for the next event, or simply someone who wants to maintain their RC hobby investment, quality replacement bearings are non-negotiable.
Key Features
- Shielded Design — The protective shields on these bearings help keep contamination such as dirt, sand and water away from the bearing races and ball elements, extending bearing life and maintaining smooth rotation even in harsh outdoor RC conditions.
- 5x10mm Size — This specific dimension makes these bearings compatible with Losi 1/4 Promoto-MX motorcycles and other Losi RC models, ensuring a perfect fit without modification or adaptation.
- Supplied as a Pair — Two bearings are included in each pack, allowing you to service one complete axle or suspension assembly, saving you from multiple purchases.
- Genuine Losi OEM Component — These are authentic original equipment manufacturer (OEM) bearings manufactured to Losi's exact specifications, guaranteeing compatibility and performance consistency with your RC model.
- Precision Ball Bearing Construction — High-quality steel ball elements race within hardened steel rings, providing low-friction performance that translates to faster acceleration, better efficiency, and improved handling characteristics.
Technical Performance
Precision ball bearings are the backbone of modern RC vehicle performance, and understanding their importance helps explain why replacement bearings are worth investing in. The 5x10mm size specification refers to the inner diameter (5mm), outer diameter (10mm), and width dimensions of the bearing, which determine compatibility and load capacity. Shielded bearings like these feature two metal shields that sit flush against the outer races, creating a sealed environment whilst still allowing the bearing to rotate freely. Unlike sealed or rubber-coated bearings, shields provide excellent protection without adding significant rotational resistance, making them ideal for high-speed applications where minimal friction loss is critical. The shielded construction helps repel water and dust that would otherwise contaminate the bearing races and cause premature wear, rust, and noise. Steel ball elements within the bearing races create multiple contact points that distribute loads evenly, reducing stress concentration and extending service life. When bearings in your RC car become worn, you'll experience increased friction that manifests as sluggish wheel rotation, grinding noises, or uneven handling. Replacing worn bearings with these genuine Losi components restores factory performance immediately. The engineering behind these small components is sophisticated—tolerances are measured in hundredths of millimetres, and materials are selected for hardness, durability, and resistance to corrosion.
What's in the Box
- Losi 5x10mm Shielded Ball Bearings × 2
Frequently Asked Questions
- Which Losi RC models use 5x10mm shielded ball bearings? — These bearings are compatible with the Losi 1/4 Promoto-MX Motorcycle RTR models, including the C-LOS06002 Promoto-MX with Battery and Charger, C-LOS06000T2 Club MX variant in blue, and C-LOS06000T1 FXR variant in red. Check your vehicle's parts diagram or manual to confirm bearing locations and quantity needed.
- How often should I replace bearings in my RC model? — Bearing replacement frequency depends on usage intensity, driving environment, and maintenance practices. Frequent outdoor use in dusty or wet conditions requires more regular replacement than occasional indoor track use. If you notice grinding sounds, resistance during free-wheeling, or sluggish performance, it's time to replace bearings immediately to prevent secondary damage to suspension and drive components.
- What's the difference between shielded, sealed, and rubber-coated bearings? — Shielded bearings feature metal shields that deflect contaminants whilst maintaining minimal rotational resistance, making them ideal for most RC applications. Sealed bearings use rubber or plastic seals for maximum protection but create slightly more friction. Rubber-coated bearings offer moderate protection with low friction loss. Shielded bearings like these Z-LOSA6937 offer the best balance of protection and performance for standard RC use.
- Can I use these bearings as direct replacements for other brands? — These are Losi genuine OEM bearings sized 5x10mm. Whilst they'll physically fit any RC component with a 5x10mm bearing cavity, using them in non-Losi vehicles may affect warranty coverage or performance tuning. Always use brand-specific bearings for your particular RC model to maintain compatibility and performance characteristics.
- How do I install replacement ball bearings? — Bearing installation requires removing the axle, wheel, or suspension component containing the old bearing, pressing or carefully extracting the worn bearing from its housing, and then pressing the new bearing in using appropriate tools or a bearing puller. Most RC builders use a bearing press to avoid damage. If you're unfamiliar with this process, your local RC hobby shop can assist with installation.
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 LOS 5x10mm Shielded Ball Bearing (2) Z-LOSA6937 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.
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