Seat Tube

Seat Tube

Seat Tube

Category

Provides stable support for bicycle and electric vehicle saddles, compatible with multiple vehicle types, and helps to create a comfortable riding experience structure.

Lightweight · High-Strength · Corrosion-Resistant · Fully Customizable for Bicycles & E-Bikes

  • ⚡ Aluminum Alloy, Lightweight Design – Reduces overall vehicle weight, making riding easier and more efficient.
  • 🏋️ High Strength & Stable Support – Excellent pressure resistance ensures saddle stability and prevents deformation during rides.
  • 🛡️ Corrosion & Oxidation Resistant – Surface treated with anodizing, polishing, or powder coating to extend product lifespan.
  • ✏️ Fully Customizable – Manufactured per your drawings; supports multiple diameters, lengths, and frame types.
  • 🌍 B2B Friendly – OEM/ODM support for bulk orders, flexible MOQ, and reliable quality.
  • +86 15606233668
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Description

Technical Parameters

Can be customized according to the drawings provided by customers for personalized customization.

Technical Reference Table

CategorySpecification / RangeNotes
MaterialAluminum Alloy 6061 / 7075/6063/6069Lightweight, high-strength, suitable for bicycles & e-bikes
Outer Diameter25–35 mmCustomizable per client drawings
Length250–400 mmAdjustable based on requirements
Max Static Load≥1000 NEnsures saddle stability under pressure
Surface TreatmentAnodizing / Polishing / Powder CoatingAnti-corrosion, oxidation-resistant
Weight300–450 gVaries with length & wall thickness
CompatibilityFits mainstream bicycles & e-bikesSupports seat clamp diameters 28.6–31.8 mm
CustomizationFully per client drawingsOEM/ODM supported

Technical Parameters

ItemSpecification / Options
MaterialAluminum Alloy 6061 / 7075
StrengthHigh pressure resistance, deformation-resistant
SurfaceAnodizing / Polishing / Powder Coating (anti-corrosion, oxidation-resistant)
CustomizationBy drawings, OEM/ODM supported
CompatibilityFits mainstream bicycles & e-bikes; seat clamp diameters 28.6–31.8 mm

Applications

  • Suitable for all types of bicycles and e-bikes
  • Ideal for saddle assembly, ensuring stable and comfortable riding experience
  • Compatible with city commuter bikes, mountain bikes, and electric bicycles
  • OEM parts for bicycle manufacturers, frame assemblers, and e-bike producers

Features

  • High Precision CNC Machining → ±0.02mm tolerance, ensures smooth bearing rotation
  • Multiple Surface Finishes → Anodized, Polished, or Painted to meet brand requirements
  • Flexible Customization → Accepts drawings, prototype to mass production

Why Choose Us?

1. Deeply engaged in the bicycle and electric vehicle parts field for many years, with mature aluminum alloy bicycle and electric vehicle production technology, and stable and reliable product quality.
2. Can customize different specifications according to customer needs to meet the diversified shape requirements of vehicle frames.
3. Strict quality inspection process, from raw materials to finished products, with multiple controls to ensure product quality.

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FAQ

Our minimum order quantity is 500kg. For orders less than 500kg, a machine setup fee of 1,000 RMB will be charged.

We accept sample orders. We can provide 1-2 samples (with a length of approximately 50-100mm). The fee includes the mold cost plus a small amount of profile processing fee. The freight shall be borne by the customer.

The delivery time is divided into two scenarios:

  1. First orders: Mold production is required first. The total cycle = mold production cycle (10-15 days) + profile production cycle (15 days; for large batches, it will be calculated based on production capacity), totaling approximately 25-27 days.
  2. Subsequent bulk production orders: The production cycle is 15 days.

Customization is available. The customer needs to provide:

  1. Detailed 2D/3D drawings (marking cross-sectional dimensions, tolerance requirements, wall thickness, length, etc.);
  2. The application of the profile (such as construction, industrial parts, heat dissipation, etc.) to recommend a suitable alloy grade (e.g., 6061, 6063, etc.);
  3. Surface treatment requirements (such as anodizing, spraying, electrophoresis, etc.) and mechanical property requirements (such as hardness, tensile strength).

The quality complies with national standards. During the production process, the following inspections will be conducted:

  1. Raw material inspection (alloy composition testing);
  2. In-process inspection (dimensional tolerance, surface quality);
  3. Full inspection before delivery (mechanical property testing, salt spray testing, etc.).

The length can be customized. Conventional extrusion machines can produce profiles with a length of 3-12 meters (depending on the equipment tonnage and mold design). For profiles requiring anodizing treatment, we recommend a maximum length of no more than 6.5 meters. Short materials can be cut according to customer requirements (e.g., 1m, 2m, etc.) with a cutting accuracy of ±0.2mm.

Common grades and their characteristics:

  1. 6063: Easy to extrude and form, with high surface finish, suitable for construction profiles (doors, windows, curtain walls) and decorative profiles;
  2. 6061: Higher strength than 6063, with good welding performance, suitable for industrial structural parts (brackets, mechanical parts);
  3. 6082: High strength and good corrosion resistance, suitable for load-bearing components (e.g., auto parts, heavy-duty frames);
  4. 7075: An alloy with higher strength;
  5. We can recommend more suitable grades according to customer needs.

We will provide an FOB price. The price is calculated as: raw material cost (aluminum ingot price + processing fee) + mold cost (for customized orders) + surface treatment fee + miscellaneous fees (packaging, transportation, etc.). The aluminum ingot price fluctuates with the market (referring to the daily price on the Shanghai Metal Exchange). Generally, the quotation is valid for 1 month.

A 30% deposit is required in advance (for customized orders involving mold costs, the full mold cost must be prepaid). After the balance is paid, we will provide the telex release bill of lading.

 If the problem is indeed caused by our quality issues, we support returns or exchanges:

  1. Customers are requested to submit a written objection within 15 working days after receiving the goods (including customs clearance and inspection time) and provide clear photos/videos of the problem (marking the order number, product batch, problem location, and details);
  2. If the problem is indeed caused by our quality issues (such as excessive dimensional tolerance, substandard surface treatment, etc., which do not meet the agreed standards in the contract):
    • If there are subsequent orders, we will either replenish the goods in the subsequent order or deduct the amount from the payment of the subsequent order;
    • If there are no subsequent orders, we will arrange a refund based on the quantity of defective

Contact us

Changfa Aluminum Group consists of Changshu Changfa Aluminum Co., Ltd. and Jiangsu Shangjia Aluminum Technology Co., Ltd., specializing in the R&D, production, and sales of aluminum alloy profiles as a large-scale enterprise group. The group occupies a total area of over 300 acres with a workforce of 400 employees and an annual production capacity exceeding 4 billion yuan.

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