LUNJE Mountain Bike Stem Extender, Fork Steerer Tube Lengthener, Head Tube Extension – Professional OEM Manufacturer of Bicycle Accessories
Product Description
Packaging Information
| Color | Length (cm) | Width (cm) | Height (cm) | Volume (cm³) | Weight (g) |
|---|---|---|---|---|---|
| 90mm Height Increaser (PE bag packaging) | 11 | 4.50 | 3.50 | 173.250 | 150 |
| 115mm Height Increaser (PE bag packaging, no box) | 13 | 4.50 | 3.50 | 204.750 | 180 |
| 135mm Height Increaser (PE bag packaging, no box) | 16 | 4.50 | 3.50 | 252 | 200 |
| 150mm Height Increaser (110mm increase) | 18 | 4.50 | 3.50 | 283.500 | 220 |
| 180mm Height Increaser (140mm increase) | 21 | 4.50 | 3.50 | 330.750 | 260 |
| 210mm Height Increaser (170mm increase) | 24 | 4.50 | 3.50 | 378 | 300 |
Kind reminder, the link to the English version image is: 💎 https://en.koofbike.com/Product_detail/29.html
Made in China, renowned worldwide. ! Click to view the product demonstration and factory processing workflow. YouTube: 
🚩 Product Features: LUNJE 28.6mm Bicycle Stem Extender
[Precise Compatibility, Wide-ranging Support]
This model LUNJE wheel tracks Bicycle handlebar stem riser, designed specifically for standard 1-1/8" (28.6mm) Fork tube design, perfectly compatible Mountain bikes (MTB), road bikes, BMX bikes, and urban commuter bikes It is the ideal choice for B2B buyers and DIY enthusiasts.
[Six specifications, with height customizable to your needs]
We offer a complete solution, ranging from lightweight designs to extreme height upgrades: 90mm / 115mm / 135mm / 150mm / 180mm / 210mm Each height‑adjusting device features laser‑etched size markings, allowing users to freely adjust the handlebar height according to their stature and riding preferences, effortlessly optimizing posture and accommodating the entire cycling lifecycle—from teenagers to adults.
[6061-T6 Forging Process, Lightweight and Durable]
The core components are of aviation-grade quality. 6061-T6 forged aluminum alloy , combining high-precision CNC machining with anodizing. It boasts excellent corrosion resistance and impact strength, with an overall weight of only 113g - 287g While ensuring resistance to DH‑level impact, it achieves an exceptionally lightweight design. The surface feels smooth and rounded, and with prolonged use, it neither fades nor damages the handlebar tape.
[Enhanced Riding Posture, Say Goodbye to Soreness]
LUNJE wheel tracks The height‑adjustment device raises the seat to a more upright position, optimizing the spine’s riding angle and significantly reducing neck, back, and lower‑back fatigue on long rides. For off‑road riders, a higher center of gravity enhances steering responsiveness downhill; for commuters, it makes navigating urban streets smoother and more comfortable.
🏭 LUNJE – The Preferred Core Factory for Global Cross-Border E‑Commerce and Top Brands
Since 2012, LUNJE wheel tracks Always focused on serving world-renowned bicycle brands, major wholesalers, and Amazon, Shopee, Lazada Top sellers offer products that are aesthetically appealing, highly durable, and compliant with regulations. OEM/ODM Solutions As a leading professional component manufacturer in China, our production processes rigorously align with the technical standards of top-tier international brands, ensuring that customers can… Factory-Direct Pricing Achieve world-class product aesthetics and industrial performance.
✅ Authoritative Certification and Outstanding Quality
As a full‑range, robust supplier of handlebars, stems, and seatposts, all our product lines have passed SGS Fatigue Testing and Strength Testing , fully compliant with ISO 4210 Safety Standard The XT series products extensively utilize aerospace-grade AL6061-T6 and 7075 aluminum alloys, ensuring safety and durability even in extreme riding conditions, thereby safeguarding your brand’s reputation.
🚀 Ultimate Efficiency and E-commerce Empowerment
We fully understand the critical need for “rapid delivery” in cross-border e‑commerce. For best‑selling items and color‑coded accessory series, we maintain a year-round inventory of… Massive in-stock inventory , we support small‑batch trial orders and ensure same‑day order response and lightning‑fast shipping. Whether you’re building your own brand or engaging in spot‑stock wholesale, LUNJE wheel tracks They are your most reliable supply-chain anchor in the bicycle parts sector.
🌟 B2B Core Advantages:
Original Patent Protection: We hold the latest utility model patents, ensuring your distribution business is free from copyright risks. 🛡️
European Access Assurance: Completed in France ADEME (EPR) Environmental Registration (certified in 2023) and Germany LUCID Compliant: the product fully complies with EU regulations. AGEC Bill: Unimpeded cross-border trade. 🇪🇺
Deep Customization (OEM/ODM): Support the brand Logo customization , Custom specification development and packaging to help your brand command a premium. 🎨
🌟 Act now and secure your personalized profit plan.
Add OEM Manager Yang Bin to obtain the following information:
Latest Wholesale Price List (Includes tiered pricing)
Product Compliance Documentation Package (SGS, LUCID, etc.)
Color swatches and physical samples (Cash on delivery or free)
Best-Selling Product Bundle Recommendations ( handlebar + stem + seatpost )
📱 Contact via WeChat/ WhatsApp: 19926456877
📧 Inquiry email: Email:
🌐 Visit our official website to explore more certified products:
SGS-certified handlebar for the sampling cart ： https://en.koofbike.com/Product/2.html
Classic Seatpost Series ： https://en.koofbike.com/Product/4.html
🏍️ 5.5mm for electric bicycles and electric motorcycles 🏍️ high-strength Thick Handlebar: https://en.koofbike.com/Product_detail/65.html
Lunji Factory is more than just a manufacturer—it’s your strategic supply-chain partner for cross-border business.
We look forward to partnering with you—pragmatic and forward-thinking—to create the next global hit!
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Contact Information
Building 3, 4th Floor, Pufite Technology Park, Dalang Street, Longhua District, Shenzhen
