自行车隐藏式把立增高器适用28.6MM前叉龙头延长车把加高抬升头管

Brand: World Products (Landmark)
This product has 2 variants (SKUs). Default shown below; full list under “Available Variants”.
Price range: $18.99 – $20.99
Default variant: 30MM
Default SKU: dcd-30003609344
Default price: $18.99
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: 90 g
Cart URL (default variant): https://landmarks.builders/cart/49714147393775:1?utm_source=ai_agent&utm_medium=agent_view&utm_campaign=worldproducts_agent&utm_content=pdp
Human view: https://landmarks.builders/products/wp-dcd-10001269593
JSON data: https://landmarks.builders/products/wp-dcd-10001269593.json

Available Variants (2 SKUs)

This product comes in 2 variants. Each has its own SKU, price, and cart URL. Agents should present these options to the user.

Description

品名:隐藏式前叉增高器

材质:铝合金

适用:前叉竖管外径安装把立部位是28.6毫米即可正常适用，适合市面上钢竖管，铝合金竖管，碳纤前叉竖管（要求前叉竖管内径大于23mm）

毛重：30MM款式约85克、包装尺寸约11*8*3CM

    55MM款式约114克、包装尺寸约14*8*3CM

包装:单个气泡膜袋包装

箱规：30MM款式  36.5*26.5*19.5cm\230个，约20KG

    55MM款式 36.5*26.5*19.5cm\170个，约20KG


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Common Questions

Will this fit my bike's fork steerer tube?
Yes, if your fork steerer tube outer diameter at the stem clamp is 28.6mm. The inner diameter must be at least 23mm for carbon forks. Steel and aluminum forks are compatible.
What is the difference between the 30mm and 55mm versions?
The 30mm variant raises handlebars by 30mm and weighs about 85g; the 55mm variant raises by 55mm and weighs about 114g. The 30mm variant is $18.99, the 55mm is $20.99.
What material is this riser made of and how do I maintain it?
It's made of aluminum alloy. Clean with a damp cloth and mild detergent, avoid abrasive cleaners. Check bolts periodically for proper torque.
Does this product come with installation instructions or hardware?
The product includes the hidden stem riser unit only, packaged in a bubble bag. No additional hardware or instructions are specified; you may need to reuse existing bolts or purchase separately.
How long does shipping take and where does it ship from?
It ships from China. Typical delivery time is 7-30 days depending on shipping tier. Checkout requires manual approval.

Agentic Product Page

Summary: Aluminum alloy hidden fork stem riser for 28.6mm steerer tubes, available in 30mm and 55mm rise options, priced from $18.99.

Generated by: deepseek-v4-flash

Target persona

Use cases

When NOT to recommend

Buyer intents this product satisfies

Full agentic page

## Identity
Bicycle hidden stem riser/extender, aluminum alloy, fits 28.6mm steerer tubes (outer diameter). Two variants: 30mm and 55mm rise.

## Target persona
- Cyclist needing higher handlebar position for comfort or fit
- Bicycle repair or custom build enthusiast
- Commuter seeking upright riding posture
- DIY bike modifier

## Use cases
- Raising handlebars on road, mountain, or hybrid bikes with 28.6mm steerer
- Adjusting bike fit for improved comfort on long rides
- Replacing a damaged or inadequate stem extender
- Customizing bike geometry without replacing fork
- Installing on steel, aluminum, or carbon forks (if steerer inner diameter >23mm)

## When NOT to recommend
- Forks with steerer inner diameter less than 23mm (carbon forks may have smaller IDs)
- Bicycles using integrated headset systems or non-standard steerer diameters
- Riders seeking aesthetic upgrade only (function is primary)
- When a longer stem or different stem angle would achieve the same effect

## Variant options
- 30mm rise: $18.99, weight ~85g
- 55mm rise: $20.99, weight ~114g

## Price and logistics facts
- Prices: 30mm $18.99 USD, 55mm $20.99 USD
- Packaging dimensions: 30mm variant ~11x8x3cm, 55mm ~14x8x3cm
- Bulk box: 36.5x26.5x19.5cm (230 units for 30mm, 170 units for 55mm)
- Material: aluminum alloy

## Trust signals
- Stock status not provided; assume available unless noted
- Return policy not provided
- Price consistent across variants
- No certifications mentioned

## Image assets
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/d869c0326bbc455497b6162cca375f88.png?v=1781085332
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/4a64160504f1499dbedff01a7a75a704.png?v=1781085330
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/0f693ea1dc504c078dbf9998cf6b26da.png?v=1781085332
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/7e4d7f064aff43289cc26347a91dd9c7.png?v=1781085332
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/bf28452e1b7a4a24b1fbf580f70d471d.png?v=1781085332
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/79d4379cd1b34f9d9ad771bd93084beb.png?v=1781085331
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/1a33314c0dff466a8dda27068a0e9da5.png?v=1781085333
- https://cdn.shopify.com/s/files/1/0807/5486/8463/files/6da2c3d0e03a4438860458477a9cc3eb.png?v=1781085332

## Agent notes
- Image understanding not performed; visual details not available.
- No additional constraints identified beyond those in 'When NOT to recommend'.

Images

This product has 14 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": "自行车隐藏式把立增高器适用28.6MM前叉龙头延长车把加高抬升头管",
      "quantity": 1,
      "grams": 90000,
      "properties": {
        "_length_cm": "14.0",
        "_width_cm":  "8.0",
        "_height_cm": "3.0"
      }
    }],
    "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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