Steer Tube

描述

Aluminum Bicycle Steerer Tube: Variable-Diameter Fork Steerer

The aluminum bicycle steerer tube is the steering column of a fork. Its upper end passes through the frame’s head tube and is clamped by the stem, while its lower end joins the fork crown. This version is a long slender tube with a change in outer diameter and a thickened lower section for press-fitting or joining to the crown and for carrying bending loads from steering and braking; variable-diameter designs are also common in tapered head tube systems with different upper and lower bearing sizes.

The joint between steerer and crown sees the highest bending stress and needs a thicker wall, while the upper section can use a thinner wall to save weight. Al Forge Tech (AFT) evaluates cold forming for the diameter change and wall thickness, finish-turns the outer diameter and joint section, and inspects diameter, roundness and straightness on CMM. Anodizing is available.

主要功能

Thickened, stepped lower section strengthens the crown joint
Thin-wall upper section saves weight
OD, roundness and straightness finish-turned and measured
Can be developed together with the triple clamp

Aluminum Bicycle Steerer Tube Specifications and Manufacturing Capability

商品	詳細
產品類別	Aluminum Forging Bicycle Parts
申請	Fork steerer tubes for bicycles and e-bikes
主要過程	Cold forming (cold forging presses 260T–2,500T), evaluated by diameter change and wall thickness
材質	Selected to customer specification; 2xxx, 5xxx, 6xxx and 7xxx series aluminum alloys available (e.g. 2014, 6061, 6082, 7075)
熱處理	根據合金與強度要求而提供的內部 T4 處理方案（8 套）及 T6 人工老化處理方案（7 套）
二次加工	CNC 加工（52 台加工中心、30 台銑床）、銑削、振動磨削
表面處理	按要求進行陽極氧化（包括硬陽極氧化）、噴射粉碎、電子塗層或塗漆。
檢查	Zeiss CMM (4 units), hardness testers, spectrometer, fluorescent penetrant inspection line
尺寸與公差	按客戶提供2D/3D圖紙
品質管理系統	IATF 16949:2016、ISO 14001:2015

Aluminum Bicycle Steerer Tube Manufacturing Process

繪圖評估與 DFM我們確認合金、載荷方向和關鍵尺寸，然後執行 QForm 模擬，以預測金屬流動和缺陷風險。.
設計與製造銑刀組數（例如，阻斷刀和完成刀）視零件的複雜程度而定，銑刀輪廓則使用便攜式3D掃描儀進行檢查。.
Cold forging: cold forming on 260T–2,500T presses, suited to thin-walled, tubular and dimensionally repeatable parts.
熱處理T4 溶液處理和 T6 人工老化處理均在廠內進行，參數由合金和強度要求設定。.
CNC加工以及完成孔、螺紋和接合面均經過機械加工，然後根據需要進行拋光、振動拋光、噴丸或陽極氧化處理。.
檢查與運輸尺寸、硬度及化學成分均通過 CMM、硬度測試儀及分光光度儀進行驗證，且所有批次的產品均遵照 IATF 16949 的標準進行追蹤。.

常見問題

Why is the lower end of the steerer thickened?

When riding and braking, front-wheel loads pass through the fork to the lower end of the steerer, where it joins the crown and bending stress is highest. The lower end therefore needs a thicker wall and larger diameter, while the less-stressed upper section can use a thinner wall to save weight. This variable section balances weight and strength.

Can AFT produce both the steerer tube and the triple clamp?

Yes. AFT produces both bicycle triple clamps and steerer tubes and can plan their fit dimensions and tolerances together from the fork assembly drawing, for example press-fit interference or joining method, with unified alloy and heat treatment specifications to reduce assembly fit issues.

How do you keep the Aluminum Bicycle Steerer Tube consistent from lot to lot?

Al Forge Tech runs incoming (IQC), in-process (IPQC) and final (FQC) inspection under IATF 16949:2016, supported by 4 Zeiss CMMs, hardness testers, a spectrometer and a fluorescent penetrant inspection line. First, middle and last pieces of every lot are checked against the die; when wear causes dimensional drift, the die is reworked to keep the Aluminum Bicycle Steerer Tube stable across lots.

Can the Aluminum Bicycle Steerer Tube be anodized or given other surface finishes?

Yes. Al Forge Tech offers anodizing (including hard anodizing), shot blasting, vibratory finishing, e-coating and painting, plus pickling and ultrasonic washing lines to clean parts after machining. Please note the finish type and film thickness on the drawing so machining allowances and cosmetic standards for the Aluminum Bicycle Steerer Tube can be evaluated together.

What information do you need to quote the Aluminum Bicycle Steerer Tube?

Please send a 3D model and 2D drawing, alloy grade and temper, critical tolerances, surface finish requirements, estimated annual volume and target delivery date. Complete data lets our engineers judge forging feasibility, the number of die sets and the machining scope for the Aluminum Bicycle Steerer Tube at the quotation stage. If the design is still conceptual, a sketch is enough to start a DFM discussion.

Request a Quote for the Aluminum Bicycle Steerer Tube

Developing a new Aluminum Bicycle Steerer Tube or converting an existing part to aluminum forging? Send us your 3D/2D drawings, alloy and temper, annual volume and finishing requirements. Our engineering team will reply with a feasibility review, die plan and quotation.

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若要比較相似的零件，請瀏覽 Aluminum Forging Bicycle Parts 以及我們的汽車鋁合金鍛造應用, 或參觀公司簡介關於我們的設備與認證。.

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