OEM Aluminum Alloy Crankset Chainrings Crank for Mountain Bicycles

• Customization: Available
• After-sales Service: as Specification
• Warranty: as Specification
• Model NO.: JF-QB
• Condition: New
• Certification: CE, BSCI, EEC, ISO9001
• Customized: Customized
• Application: Kids Bike, Road Bike, Mountain Bike, Ordinary Bicycle
• Chainwheel Teeth: 44-52T
• Material: Alloy
• Item: Bicycle Chainwheel Crank
• Technics: Forging
• Part Type: Bicycle Crank
• Weight: as Per UR Requirements
• Export Markets: Global
• Shipping Port: Qingdao,Ningbo, Shanghai
• Surface Treatment: Spraying/Polishing/Galvanized/Electroplating
• Packing: Wooden Cases or Carton
• Place of Origin: China
• Transport: by Sea or Air
• OEM Service: Yes
• Custom Made: Yes
• Logo Printing: Customized
• MOQ: 10-100PCS
• Free Sample: Yes
• Transport Package: Plywood
• Specification: SGS
• Trademark: JF
• Origin: Weifang City, Shandong Province, China
• HS Code: 7326199000
• Production Capacity: 10000PCS/Month
• Package Size: 30.00cm * 20.00cm * 15.00cm
• Package Gross Weight: 10.000kg

Product Description

 OEM Aluminum Alloy Crankset Chainrings Crank for Mountain Bicycles

 

Product Description

 

Crank Construction: 2 pieces solid crank
Cassette compatability:8 speed; 9 speed
Chainring numbers:42-32-22T
Bolt Circle Diameter:104/64mm
Color:Black
Crank Arm material:Aluminum Alloy
Crank Arm Length:170mm
Bottom bracket: fits standard 68mm and 73mm shell.

Tolerance	± 0.02mm
Surface Treatment	Chrome Plating, Zinc Plating, Nickel plating, Electrophoresis, Anodization, Polishing, Powder coating, Sandblasting, Passivation, Spray painting, Etc.
QualityAssurance	ISO9001:2015 Certified, SGS Certification
QualityGuarantee	Two years
Inspection	1.Foundry in-house: 100% inspection on critical dimension; 100% on appearance. 2.Third Party inspection available upon requirement
Mainly Testing Facility	Three-dimensional measuring instrument, Salt spray test box, Dynamic balance detector, Pneumatic detection
Payment term	T/T, L/C
Lead time	Usually 20 days after order confirmed
Features & Advantage	1.High machining accuracy, the flatness within 0.1mm. 2.High strength and not easy to deform, has good electrical and thermal conductivity. 3.High finish appearance, smooth surface roughness is Ra1.6 after machining.

     Color:Seven colors
     Weight: 276g [Gear ratio] 11-28T (11-13-15-17-19-21-23-25-28T)
    *Road cassette type 9-speed variable speed bicycle flywheel, compatible with the variable speed
      systems of major mountain brands.
    *Made of high-strength steel, using quenching and tempering hardening technology. Therefore, it has
      high strength, durability and strong wear resistance. Strong oxidation resistance, not easy to rust, and
      long service life. Due to the unique design of the car sprocket, the shift function can be well controlled.
    *Using hollow design, the weight is reduced. The surface is made of vacuum colorful electroplating
      process. No fading phenomenonon the electroplated surface. The surface is more beautiful, giving
      a luxurious feeling.

Our Advantages

 

Sample

1) sample fee:The sample fee just the cost price , the sample fee is refundable if you place a big order later
2) freight: we usually send samples through Express such as UPS, DHL, Fedex, etc. or on your own requirement
3) sample time: 7-10 days
Service

1)Your inquiry will be replied within 6 hours.
2)Well-traind&experienced sales can reply your inquiries in English.
3)During working time,E-mail will be replied to you within 1 hours.
4)OEM&ODM projects are highly welcomed.
5)The order will be produced exactly according to order details and proofed samples,our QC will submit inspection report before shipment.
6)Your business relationship with us will be confidential to any third party.
7)Good after-sale service.

 Here are some of our other best-selling products for you to choose from

* NARROW WIDE TOOTH DESIGN:The new narrow-wide teeth design increases chain retention, ensures
   ultimate chain retention,increases wear life,and reduces friction and noise.
* SINGLE CHAINRING:Through the modification single speed chainrings, reduced the transmission system
   greatly ,completely abandoned the complex variable speed system,reduce the bike weight at least 1kg,
   looks more compact and simple, and also greatly improve your speed.
* SPROCKET RING: The narrow wide tooth design increasing the contact area with the chain greatly, so
   that each of the teeth can be fully inserted into the chain, increase the grasp force, make you no longer
   worried about the chain dorpped, easy to pass through bumpy road.

Packaging & Shipping

 

 

FAQ

1. What is a bicycle crankset?
A bicycle crankset (often called "cranks") is the component that converts your pedaling force into rotational motion to drive the chain and rear wheel. It consists of one or more chainrings, the crank arms, and the bottom bracket spindle or axle interface.
2. What types of cranksets do you manufacture?
We produce a wide range to suit various cycling disciplines:

• Road: 1x and 2x configurations, focusing on lightweight and stiffness.
• Mountain Bike (MTB): 1x (predominant) and 2x, built for durability and impact resistance.
• Gravel: Often 1x or 2x, balancing gear range and mud clearance.
• City & E-Bike: Robust designs built to handle higher torque and daily use.

3. What materials are used?
We use advanced materials to optimize performance:

• Aluminum Alloys (6061, 6066, 7075): The standard for most cranks, offering an excellent balance of strength, weight, and cost.
• Carbon Fiber: Used in high-end road and MTB cranks for maximum stiffness-to-weight ratio and vibration damping.
• Steel/Titanium: Used for specific applications like spindle/axles or boutique builds for unique properties.

4. How do I choose the correct crank arm length?
Crank arm length affects pedaling efficiency and comfort. Common lengths range from 165mm to 175mm.

• A general rule is that it correlates with rider height/inseam.
• We recommend consulting a bike fitter or using online sizing guides. We offer multiple lengths for most models.

5. What is the Bottom Bracket (BB) standard compatibility?
Compatibility is crucial. Our cranksets are designed for major BB standards, including:

• Threaded: BSA (English), ITA.
• Press-Fit: BB30, PF30, BB86/92, PF86/92.
•  Hollowtech II: A proprietary external cup standard.
• SRAM DUB: A popular 28.99/29mm spindle standard for wide compatibility.
  Please specify your bike's BB standard when inquiring or ordering.

6. What about chainring compatibility?
We offer cranksets with various chainring mounting standards:

• Direct Mount: Chainrings bolt directly to the crank spider (common on SRAM, some , and 1x systems).
• 4-Bolt/5-Bolt: Traditional spider patterns (e.g., 110mm BCD, 130mm BCD).
• Asymmetric ( Dyna-Sys): Proprietary 4-bolt patterns.
  We supply complete cranksets and also offer replacement chainrings for our models.

7. What is your MOQ (Minimum Order Quantity)?

• For standard catalog models, our production MOQ is typically 500 units.
• We support OEM and ODM projects with flexible MOQs, which are determined based on design complexity and tooling investment. Prototype samples are available for development.

8. Can you create custom designs or branding?
Absolutely. We specialize in OEM/ODM services. We can work from your CAD drawings or help design a crankset to your specifications. Custom machining, surface finishes (CNC machining, laser etching, anodizing colors), and private labeling are all available.
9. What is your quality control process?
Our cranks undergo stringent testing, including:

• Fatigue & Impact Testing: Simulating thousands of pedal strokes and potential strikes.
• Stiffness (Deflection) Testing: Ensuring optimal power transfer.
• Dimensional Accuracy Checks: Using CMM for precise interface measurements.
• Surface & Finish Inspection: For consistent aesthetics and protection.

10. What are the available finishes?
We offer various finishes for aesthetics and durability:

• Anodizing: Black, silver, grey, and custom colors.
• Shot Peening & Polishing: For a raw alloy look.
• Laser Etching/Logos: For precise branding.
• Clear Coating: To protect machined surfaces.

11. What are your lead times and payment terms?

• Lead Time:
  • Samples: 3-5 weeks after confirmation.
  • Production: 8-12 weeks after sample approval and deposit receipt.
• Payment Terms: Standard terms are 30% T/T deposit with order, 70% balance before shipment. For established partners, other terms can be discussed.

12. How should I install and maintain the crankset?
We provide installation guidelines with each product. Key points:

• Use a torque wrench to tighten all bolts (spindle, chainring, pre-load cap) to the specified Nm value.
• Apply the correct assembly compound (if required for press-fit systems).
• Regularly check for bolt tightness and clean the chainring teeth.
• For carbon cranks, avoid using harsh cleaners and inspect for cracks after any impact.

13. Do you offer a warranty?
Yes. We offer a standard 2-year warranty against manufacturing defects in materials and workmanship under normal use. Warranty does not cover improper installation, crashes, or misuse.

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