See It In Action: Watch Our Manufacturing Process on YouTube ：

🏆 The Stem That Defined a Category        
Since 2018, this LUNJE® XT-A015 stem has set the standard for lightweight CNC construction—proven on trails worldwide and trusted by leading brands. This isn't just another stem; it's the original hollow-out design that competitors still try to replicate.

Patented Stem Series:  Our lineup includes both CNC-machined and 3D forged stems. We leverage multiple structural innovation patents (e.g., CN114228889A) to optimize the clamping force and weight ratio, ensuring maximum cockpit stability.

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 CN222728170U in the search box to query.

🌟 LUNJE® Professional CNC Bike Stem Factory 🌟 Maximize your wholesale margin with our global bestseller. As a leading Alloy bike stem manufacturer, we deliver high-demand CNC bike parts with certified safety standards.

💎 Technical Specifications:

✅ Certification: SGS Certified Bike Parts (Fatigue & Impact Tested)

✅ Material: Premium 7075/6061 Aluminum Bike Parts (T6 Heat Treated)

✅ Process: 100% Full CNC bike stem precision machining.

✅ Aesthetics: Anodized Vibration Color / Oil-Slick options.

✅ Service: OEM MTB parts specialist & Bicycle parts custom logo.

🔥 Why This Stem Dominates OEM Orders

1. ENGINEERED LIGHT, BUILT STRONG        
• True Hollow-Out CNC Design: 5-axis machining removes every possible gram without sacrificing DH-level stiffness—no fake cutouts or cosmetic gimmicks.        
• Short & Aggressive Geometry: 35mm/45mm lengths deliver instant steering response for technical trail and enduro riding.        
• Aircraft-Grade 6061-T6: Heat-treated and CNC-finished for the optimal balance of strength and fatigue resistance.

2. THE TWO-TONE ANODIZING PIONEER        
• Industry-First Finish: We developed the dual-color anodizing process that became the benchmark for premium aesthetics.        
• UV & Scratch-Resistant: Colors stay vibrant through seasons of sun, sweat, and abuse.        
• Brand-Defining Colors: From stealth black to holographic oil slick—customize your signature look.

3. SGS-CERTIFIED & MARKET-PROVEN        
• Independently Verified: Tested to exceed ISO 4210 standards for load, fatigue, and safety.        
• 5 Years of Real-World Validation: Trusted by downhill racers, enduro teams, and volume brands globally.        
• Zero Compromise Reliability: Every stem is torque-tested and inspected before shipment.

4. STRATEGIC PARTNER PROTECTION        
• Exclusive Series for Distributors: Differentiated A/B versions prevent cross-market competition and protect your margins.        
• Full EU/US Compliance: LUCID-registered (VerpackG) and EPR-ready for seamless import into regulated markets.        
• True Factory-Direct Pricing: No brokers or middlemen—work directly with our engineering team on custom solutions.

📈 Source Factory OEM ADVANTAGE

For Brands & Volume Buyers:        
✔ Low MOQ Customization: Laser etching, color matching, packaging        
✔ Tiered Pricing Scales: Competitive margins at every volume level        
✔ Technical Partnership: Co-develop exclusive stem variations        
✔ Stock & Just-in-Time Programs: Reliable supply with flexible terms

🚀 READY TO LAUNCH YOUR STEM LINE?

Contact George, OEM Manager:        
📧 Email: lunje.bicycle@gmail.com 

📱 WeChat / WhatsApp: +86 13798419681 

📧 Email: lunje.bicycle@gmail.com

🔗 Explore More Products: https://en.koofbike.com/Product/1.html

🔗  Butted Handlebars with Certificates: https://en.koofbike.com/Product/2.html

25.4mm Series Handlebar (30-190mm High Rise) : https://en.koofbike.com/Product_detail/21.html

🔗 Classic Seatposts: https://en.koofbike.com/Product/4.html

2026 New adjustable Seatpost: https://en.koofbike.com/lunje-patented-adjustable-seatpost-factory

👉 Reinforced Riser Bars for Electric Motorcycles:

https://en.koofbike.com/Product_detail/65.html

LUNJE Factory is seeking strategic partnerships with brands and distributors. Let’s build a strong brand together. Wishing our partners great success and prosperity! 🤝