Official Platform of the China National Intellectual Property Administration (CNIPA)

Visit the China Patent Publication Announcement Network (http://epub.cnipa.gov.cn/).

Enter the patent number CN202421206159.4 in the search box to query. （Utility Model Patent）

See It In Action: Watch Our Demo on YouTube ：

LUNJE XT-A828 / XT-A829 | Precision Suspension Stem  
Key Technical Features  
1. Advanced Pivot-Link Suspension (Not a Simple Telescopic Design) Engineered with a high-precision pivot mechanism rather than a basic telescopic slide, the XT-A828/A829 utilizes its 100/140mm leverage to deliver linear, progressive damping. This design effectively neutralizes high-frequency chatter from gravel and sharp square-edge hits, drastically reducing wrist fatigue and "arm pump" during extended rides.

2. Dual-Spring Tunable Damping (Customized Soft & Hard Rates) We’ve eliminated the "one-size-fits-all" compromise. Each unit includes interchangeable Soft and Hard high-rebound springs. This allows riders to fine-tune their suspension based on body weight (lightweight vs. heavy-duty) or riding style (aggressive racing vs. plush touring), ensuring a truly personalized tactile response.

3. Massive ±60° Adjustable Geometry Specifically optimized for the larger European physique and long-distance trekking, the ultra-long 140mm reach combined with a 60-degree rise allows for an instantaneous transition to an upright, ergonomic "comfort-first" position. It is the ultimate solution for E-bike commuters and long-range touring enthusiasts looking to eliminate lower back strain.

4. Performance 3D-Forged Construction Moving beyond cheap, brittle casting, the XT-A828/A829 is 3D-Forged from high-grade aluminum alloy. This process ensures continuous grain flow within the metal, providing superior structural integrity, exceptional torsional stiffness, and a lightweight profile that survives the most rigorous stress cycles.

5. Patented Design & Global Inventory Readiness Backed by a comprehensive design and structural patent (No. ZL202330816459.9), this stem offers cross-border sellers full protection against IP infringement and "copycat" listings. Both 100mm and 140mm specs are in stock in Anodized Black and Purple, ready for immediate dispatch to capture the 2026 Spring-Summer peak season..

🏭 LUNJE® – The Preferred Hardware Factory for Global E-commerce & Top Brands

Since 2012, LUNJE® has been a specialized manufacturer providing high-strength, high-aesthetic, and compliant OEM/ODM solutions for world-renowned bicycle brands, large-scale wholesalers, and top-tier sellers on Amazon, Shopee, and Lazada. As a leading Chinese component manufacturer, our production processes strictly align with the technical standards of global tier-1 brands, ensuring you receive world-class performance at Factory-Direct Pricing.

✅ Certified Excellence & Industry Standards

As a full-category supplier of handlebars, stems, and seatposts, our products pass rigorous SGS Fatigue and Strength Testing and fully comply with the ISO 4210 Safety Standard. By utilizing aerospace-grade AL6061-T6 and 7075 alloys, we guarantee maximum safety and durability, protecting your brand's reputation in extreme riding conditions.

🚀 Extreme Efficiency & E-commerce Empowerment

We understand the "Need for Speed" in cross-border e-commerce. For our best-selling series and colorful anodized components, we maintain massive ready-to-ship inventory. We support small-batch trial orders with same-day dispatch. Whether you are building a private label or sourcing wholesale, LUNJE is your most stable supply chain partner in the cycling industry.

🌟 B2B Core Advantages:

Original Patent Protection: With the latest Utility Model Patent, we ensure your distribution business is free from copyright risks. 🛡️

EU Market Access: Registered with ADEME (EPR) in France (since 2023) and compliant with LUCID in Germany. Fully meets EU AGEC act requirements for barrier-free cross-border trade. 🇪🇺

Deep Customization (OEM/ODM): Supporting Logo Customization, specification development, and tailored packaging to boost your brand premium. 🎨

📞 Take Action Now – Get Your Exclusive Profit-Driven Quote!

LUNJE is committed to supporting bike shops, e-bike modifiers, and international distributors with factory-direct pricing and reliable lead times.

Connect with Our Factory Representative:  
For bulk pricing, technical drawings, or OEM collaboration, reach out to us directly:

📱 WeChat / WhatsApp: +86 13798419681

📧 Email: lunje.bicycle@gmail.com

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