CNC Aluminium Alloy Mountain Bicycle Stem

CNC Aluminium Alloy Mountain Bicycle Stem


  • ☆【Premium Quality】: This 100% brand new bike stem is made of high quality aluminium alloy material, which is sturdy and durable in use. It is not easily damaged and deformed, has reliable quality and ensures high strength for long lasting usage.
  • ☆【Exquisite Workmanship】: The 31.8mm mountain bike stem adopts excellent manufacturing with high reliability, CNC processing and anodization treatment ensure sleek & colorfast surface and great anti-corrosion feature, which can provide you with a superior using effect.
  • ☆【Fitment】: The bike tube stem replacement is suitable for front fork diameter 28.6mm, handlebar diameter 31.8mm, which is a good replacement for your mountain bike.
  • ☆【Easy Installation】: The 31.8mm mountain bike stem is easy to install on your bike stem and can firmly connect your handlebar. Front fork tube diameter: approx. 28.6mm / 1.13in; handlebar diameter: approx. 31.8mm / 1.25in; distance between 2 hole: approx. 90mm / 3.54in.

aluminium alloy

Production equipment

CNC Machining


Powder Coating



Production lead time



30% deposit; 70% balance payment or 100% payment depending on Order Quantities.

CNC Aluminium Alloy Mountain Bicycle Stem


  • Mountain Bike Stem, CNC Aluminium Alloy Mountain Bicycle Stem Bike Tube Stem Replacement Part Accessory Suitable for Front Fork Diameter 28.6mm, Handlebar Diameter 31.8mm★ The stem adopts quality aluminium alloy, high strength and anti-deformation.
    ★ CNC processing and anodization treatment ensure sleek and colorfast surface and great anti-corrosion feature.
    ★ Easy to install on bike stem and firmly connect handlebar.
    ★ Suitable for front fork diameter 28.6mm, handlebar diameter 31.8mm.
    ★ Good replacement for your mountain bike.

    Material: Aluminium alloy
    Color: Shown as picture
    Front Fork Tube Diameter: Approx. 28.6mm / 1.13in
    Handlebar Diameter: Approx. 31.8mm / 1.25in
    Distance between Two Hole: Approx. 90mm / 3.54in
    Degree: -/+ 45 degrees
    Weight: Approx. 238g

    Package List:
    1 x Bike Stem


Competitive factory price and superior quality

Professional and experienced technology team

Focus in high precision CNC machining

Consistently meet the tight tolerances required

Low MOQ and free sample

Short lead time (20 working days)

 ISO9001:2008 certification and materials accord with Rohs standard

Excellent after sale service and good warranty

Our service

Electronic and communication, Aerospace, Optical instrument, Medical and pharmaceutical,

Oil, gas and petroleum, Railway, electric tool, car, robot, hydraulic equipment


CNC Machining Center, CNC Lathes, CNC Milling Machines, wire cutting, laser cutting

Stamping machines , Assembly lines, Whole set of measurement tools

Precision Processing

CNC machining, CNC milling and turning, laser cutting, drilling, grinding, bending, stamping, welding and so on

Drawing format

JPEG,PDF,DWG,DXF,IGS,STEP.CAD or according to your sample


Stainless Steel, Brass,  Aluminum, Steel, Carbon Steel, Titanium , plastic. Or other Exotic Alloys

Surface Finish

Anodize; Blacken, polishing, plating, sand blasting


+/- 0.002–0.20 mm / can also be customized.


100% inspection before shipping

Payment Terms

30%T/T in advance, the balance before delivery;  Paypal is acceptable


  1. Drawings (CAD, STP, PDF formats) or Sample
  2. Quantities; Materials; tolerance; surface treatment or other special requirements
  3. Our engineer can offer technique supports to design or modify drawings according to requirements from customers

Lead Time:

  1. Sample Lead Time: 3~7 days
  2. Production Lead Time: 10~30 days based on different products
  3. Shipment time: 7 days with DHL/FEDEX/UPS; 20 days with fast Ocean shipment; 30~45 days with Normal Ocean Shipment

Quality Guarantee:

  1. We have IQC inspect all raw materials at incoming department
  2. IPQC inspect and measure the machining parts during mass production
  3. OQC inspect and measure the finished products according to Drawings and SIP documents with MIL-STD-105E
  4. We guarantee all products/parts comply with drawing and other quality criteria requirements on the contract and approval documents, will rework all defect products or refund to customers if receive non-good products.

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