Specialized 6903/19-2RS 19mm Bore Sealed Bearings for High-End MTB Hubs
| Item No : | 6903/19-2RS (Non-Standard Custom Bore) |
| Size (d*D*B) : | 19x30x7mm |
| Material : | Chrome Steel GCr15 |
| Lead Time : | 3-5 days |
| Weight : | 0.0155KG |
| MOQ : | 100 pcs |
| Service : | Support Sample Testing |
⚙️Product Description:
The 6903/19-2RS (19x30x7mm) is a highly specialized, non-standard thin-section ball bearing. While standard 6903 bearings feature a 17mm bore, this customized 6903/19 version boasts an enlarged 19mm inner diameter while maintaining the compact 30mm outer diameter. This unique geometry allows engineers to use thicker, stiffer 19mm axles within constrained 30mm housings, entirely eliminating the need for complex stepped shafts or adapter sleeves. Built for precision and durability, we supply these hard-to-find custom bearings under our reliable RMO brand, offering flexible multi-brand OEM solutions tailored for the global cycling and specialized machinery sectors.
⚙️Product Features:
- Custom 19mm Bore Design: Perfectly fits 19mm shafts directly, increasing axle stiffness and torque transmission capacity without increasing the housing footprint.
- All-Weather 2RS Sealing: Equipped with premium dual-lip rubber seals to block mud, water, and trail dust, significantly prolonging lifespan in outdoor environments.
- Optimized Internal Clearance: Engineered with precise radial clearance to prevent bearing bind when pressed into tight alloy hubs or motor casings.
- Premium GCr15 Steel: Forged from high-grade chrome steel, delivering exceptional resistance to point-loading and fatigue typical in axle pivot points.
⚙️Product Application:
Driven by its specific 19mm inner diameter, the 6903/19-2RS is an irreplaceable component for:
- High-end mountain bike (MTB) wheel hubs and custom rear suspension pivots.
- BMX and road bike lightweight bottom brackets designed for 19mm spindles.
- Specialized brushless DC motors requiring oversized rotor shafts.
- Custom robotics joints and non-standard industrial gearboxes.
⚙️Precautions:
| 1. Keep clean | 2. Use with caution | 3. appropriate tool | 4. Hot-loading | 5. Be careful of rust |
| Dust will have a bad effect on the bearing, so keep the surrounding clean. | Strong impact during use can easily cause scratches and indentations. | Avoid replacing existing tools, and use appropriate tools. | Bearings are precision parts, so hot installation is recommended. | Sweat on your hands during operation will cause rust, so it is best to wear gloves. |
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⚙️Obtain Certificate:
About Rimao
Since its establishment in 2011, Rimao Bearing has combined international vision with local wisdom and injected innovative ideas into every bearing and pulley with its profound industry accumulation and unremitting pursuit of technology. We have not only passed CE and ROHS certification, but also set a new benchmark in the industry and led the development trend of the bearing industry.
We are not just a ball bearing and roller bearing importer and wholesaler. We provide real solutions to help you achieve the product and design goals set by your customers. With more than 20 years of production and sales experience, tens of thousands of models and specifications, we look forward to cooperating with you!
⚙️Technical Parameters:
| Model / Industry No. | 6903/19-2RS (Non-Standard Custom Bore) |
| Metric Dimensions | 19x30x7mm (Inner d x Outer D x Total Width/Height H) |
| Bearing Type | Thin Section Deep Groove Ball Bearing |
| Special Feature | Enlarged 19mm Inner Ring |
| Material | Chrome Bearing Steel GCr15 |
| Seal Type | 2RS Dual Contact Rubber Seals |
| Lubrication | Pre-filled Water-Resistant Grease |
| Target Machinery | Bike Hubs, Bottom Brackets |
| Brand | RMO (Own Brand) / Neutral / OEM Custom / Other Global Brands |
| Package | Individual plastic bag, plastic tube or original RMO brand box |
| Lead Time | 3-5 days for stock; 7-15 days for bulk orders |
| Shipping | Express (DHL/FedEx/UPS), Air Freight, Sea Freight |
| Payment | 100% TT, or 30% TT In Advance, 70% TT After Finished Production |
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