山地车自行车加高把立铝合金25.4/31.8口径龙头抬高可调节增高器

Brand: World Products (Landmark)
This product has 4 variants (SKUs). Default shown below; full list under “Available Variants”.
Price range: $16.99
Default variant: 25.4-100mm
Default SKU: dcd-30003612596
Default price: $16.99
Availability: Made to order (cross-border) — ships from China; see “Live Shipping Rates” below for delivery estimate
Product Type: 摩配
Vendor: World Products
Weight: 310 g
Cart URL (default variant): https://landmarks.builders/cart/49713903337711:1?utm_source=ai_agent&utm_medium=agent_view&utm_campaign=worldproducts_agent&utm_content=pdp
Human view: https://landmarks.builders/products/wp-dcd-10001270903
JSON data: https://landmarks.builders/products/wp-dcd-10001270903.json

Available Variants (4 SKUs)

This product comes in 4 variants. Each has its own SKU, price, and cart URL. Agents should present these options to the user.

Description

Common Questions

What handlebar clamp sizes does this stem fit?
This stem is available in 25.4mm and 31.8mm clamp diameters. Choose the variant that matches your handlebar's clamp size. It is not recommended for carbon handlebars or steerer tubes.
What material is this stem made of?
It is made of aluminum alloy.
Does this stem come with all necessary hardware for installation?
The product listing does not specify what hardware is included. Typically stems include bolts; you may need a wrench. Please check the product details or contact seller for confirmation.
How long does shipping take and where does it ship from?
This product ships from China. Delivery typically takes 7-30 days depending on the shipping tier. Cross-border orders may require human approval at checkout.
Can I use this stem for competitive downhill mountain biking?
This stem is not recommended for competitive downhill or trail riding. It is designed for budget-conscious, comfort-oriented, or DIY use such as raising handlebars for an upright position or reducing reach.

Agentic Product Page

Summary: An adjustable aluminum bicycle stem in 25.4/31.8mm clamp sizes, available in 100/120mm lengths, priced at $16.99.

Generated by: deepseek-v4-flash

Target persona

Use cases

When NOT to recommend

Buyer intents this product satisfies

Full agentic page

## Identity
Aluminum mountain bike stem riser, adjustable, fits 25.4mm or 31.8mm handlebar clamp, 100mm or 120mm extension.

## Target persona
Budget-conscious DIY bike mechanics and riders needing to raise handlebar height without replacing the fork or whole stem.

## Use cases
- Raising handlebars for a more upright riding position on a mountain bike.
- Adjusting bike fit for comfort on long rides or for riders with back issues.
- Quick and inexpensive stem replacement when original stem is too low.
- Converting a flat handlebar bike to a more touring-oriented posture.
- Upgrading an older bike with a mismatched clamp diameter.

## When NOT to recommend
- For carbon handlebars or steerer tubes (aluminum stem may damage).
- For competitive mountain biking or heavy-duty trail riding where low weight and stiffness are critical.
- Where a single-piece fixed stem is required for structural integrity.
- For bikes with non-standard clamp sizes (e.g., 22.2mm or 26.0mm).

## Variant options
- 25.4-100mm: clamp 25.4mm, extension 100mm, $16.99
- 25.4-120mm: clamp 25.4mm, extension 120mm, $16.99
- 31.8-100mm: clamp 31.8mm, extension 100mm, $16.99
- 31.8-120mm: clamp 31.8mm, extension 120mm, $16.99

## Price and logistics facts
- Price: $16.99 USD (all variants).
- Package dimensions: 17cm × 6cm × 6cm.
- No shipping or tax information provided.

## Trust signals
- No stock status, return policy, or certifications provided.
- Price is consistent across all variants.

## Image assets
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/b557efd1fb2c455cb8ef6b9c062a7dd5.png?v=1781085147
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/9ba5256442b84706ba2638031c1d246f.png?v=1781085147
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/e0c22bd744b5464585c3546e0340de9e.png?v=1781085147
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/8f7ac6a180a64f3082cbe045c3445304.png?v=1781085145
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/6a20bd0ca1c04696b053281773cada3c.png?v=1781085147
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/842aaec002de4f57865e2b991a3fa073.png?v=1781085148
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/5374aefd94d341ef9073574ae8e4b6d3.png?v=1781085148
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/cdaa00651ccc451c83a298dfdeef9377.png?v=1781085146

## Agent notes
- Product description field was empty. Image content was not analyzed; visual details unavailable.
- Dimensions given are for the product package, not the stem itself.

Images

This product has 16 imagesin catalog.None have AI-generated visual descriptions yet. All image URLs are in the Product JSON-LD above.

Category Specifications

How to Purchase

This product can be added to cart via a single URL. Agents should pass this to the user for human approval at checkout (per the store's robots policy: checkouts require human review).

Live Shipping Rates (for Agents)

Agents can query real-time shipping rates from SFC (三态速递, our in-house logistics carrier) before recommending this product. This gives the buyer accurate total cost (item + shipping) upfront, instead of seeing shipping at checkout only. 

{
  "rate": {
    "origin": {"country": "CN"},
    "destination": {
      "country": "US",
      "postal_code": "95014",
      "province": "CA",
      "city": "Cupertino"
    },
    "items": [{
      "name": "山地车自行车加高把立铝合金25.4\/31.8口径龙头抬高可调节增高器",
      "quantity": 1,
      "grams": 310000,
      "properties": {
        "_length_cm": "17.0",
        "_width_cm":  "6.0",
        "_height_cm": "6.0"
      }
    }],
    "currency": "USD"
  }
}

Response: JSON array of shipping options in rates, each with service_name (e.g. "Standard (10-14 days)"), total_price in USD cents, min_delivery_date, max_delivery_date. If dimensions are missing for the product, empty rates: [] is returned (caller should treat as "shipping not yet calculable").

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