The 24-inch folding bicycle bridges the functional gap between compact small-wheel platforms and the ride stability of standard adult commuter geometries. Built around a rigid main triangle and an engineered folding interface, the frame supports a 120 kg payload capacity while compacting down to an 880 x 350 x 720 mm footprint for container consolidation and multi-modal transit storage.

Key Product Features

01/

Precision Locking Hinge: Forged aluminum hinge box equipped with a spring-loaded secondary safety pin prevents accidental release under dynamic load torsion.

02/

Optimized Wheel Diameter: 24-inch wheelset maintains momentum and rolls over urban road irregularities (potholes, expansion joints) significantly better than 16-inch or 20-inch alternatives.

03/

Telescopic Cockpit: Dual quick-release clamps adjust seatpost and stem height compatibility for riders from 145 cm to 190 cm without tools.

04/

Integrated Cargo Mounts: Rear brazed-on eyelets support pannier racks rated up to 25 kg for commercial logistics and commuting applications.

Technical Specifications

Specification Item	Metric / Standard
Wheel Size	24 inches (507 ISO rim diameter)
Frame Material	Hydroformed 6061-T6 Aluminum Alloy
Folded Dimensions	880 x 350 x 720 mm
Net Weight	13.5 kg (excluding accessories)
Max Payload	120 kg (rider plus cargo)
Drivetrain	Shimano Altus 7-Speed (14-28T cassette, 48T chainring)
Brake System	Mechanical disc brakes (160 mm rotors front/rear)
Tire Specification	24 x 1.75 urban tread with puncture-resistant Kevlar belt
Compliance	ISO 4210-2 (City and trekking bicycles)

Frame & Structural Design

The frame utilizes hydroformed 6061-T6 aluminum tubes joined via automated robotic MIG welding to maintain consistent bead penetration. Critical stress junctions-specifically the headtube gusset and main fold interface-are reinforced with forged aluminum inserts. The center-fold hinge integrates an adjustable tapered brass shim system to compensate for wear and eliminate lateral play over long-term operation.

Components & Configuration

Drivetrain:

Shimano 7-speed index shifting paired with a sealed-cartridge bottom bracket prevents grit intrusion in wet operating environments.

Braking:

Dual-piston mechanical disc calipers actuate on stainless steel rotors, delivering stopping power matching EN 14766 performance protocols.

Contact Points:

Ergonomic rubber compound grips secured with aluminum lock-rings prevent rotation slippage; wide urban saddle incorporates dual-density base foam and chrome-moly rails.

Applications

Corporate Campuses: Deployed by facility management for internal transit across large industrial and institutional complexes.

Public Transport Fleets: Permitted on commuter rail systems and buses during peak transit hours due to its standardized folded footprint.

Hospitality & Tourism: Utilized by hotels and resort operators for guest rental fleets requiring minimal storage space.

Urban Logistics: Fitted with front cargo baskets for last-mile courier delivery in high-density pedestrian zones.

Customization Options

Color Matching: Frame and fork powder coating available in RAL color system matching client brand identity.

Branding: Custom laser-etched headtube badges, water-transfer downtube logos, and customized chainstay protectors.

Component Tiering: Powertrain configurable from single-speed internal gear hubs (Shimano Nexus) to 8-speed external derailleurs based on target price point and terrain requirements.

OEM & ODM Manufacturing

Factory infrastructure supports end-to-end contract manufacturing.

Prototyping: 3D CAD modeling, finite element analysis (FEA) structural simulation, and CNC-machined rapid prototyping delivered within 15 business days.

Tooling: In-house mold workshop for custom aluminum extrusion dies and plastic injection parts (fenders, chain guards).

Traceability: Laser-engraved unique frame serial numbers on the bottom bracket shell map to raw material batch test reports and welding operator IDs.

Quality Control

Production follows ISO 9001 certified manufacturing protocols across four distinct inspection gates:

Incoming Material Testing:

Spectrometer analysis verifies aluminum alloy chemical composition (6061 ingot verification) and tensile strength.

Frame Fatigue Testing:

Frame samples undergo 100,000 vertical load cycles at 1,200 N and pedaling torque tests exceeding EN 4210 parameters prior to batch release.

Sub-Assembly Inspection:

Wheel truing tolerance maintained within +/- 0.5 mm lateral and radial runout; torque verification on all critical fasteners using calibrated pneumatic drivers.

Final Audit:

100% functional testing of folding mechanism locking force, gear indexing accuracy, and brake caliper alignment on final assembly line.

Packaging & Shipping

Carton Specification: 5-layer double-wall corrugated export carton (900 x 370 x 750 mm).

Internal Protection: High-density EPE foam blocks secure the frame, fork, and handlebars to prevent transit abrasion.

Disassembly State: 85% pre-assembled (front wheel, handlebar, and pedals require installation via included 15mm open wrench and 6mm hex key).

Container Loading:
• 20ft GP Container: 180 units (in master cartons)
• 40ft HQ Container: 420 units (in master cartons)

MOQ & Lead Time

Minimum Order Quantity (MOQ):

• Standard specification with stock colors: 50 units per SKU.
• OEM custom color / branding: 200 units per order.

Production Lead Time:

• Initial order: 35 to 45 days from deposit receipt and artwork approval.
• Repeat orders: 25 to 30 days.

Frequently Asked Questions

Q: What is the maximum weight capacity and safety standard compliance for this folding bike?

A: The frame is rated for a maximum total load (rider plus cargo) of 120 kg. It complies with ISO 4210-2 testing standards for city and trekking bicycles, verified through independent laboratory fatigue testing.

Q: How does the folding mechanism prevent accidental opening during transit?

A: The hinge utilizes a primary clamp lever secured by a spring-loaded secondary safety locking pin. This pin must be manually depressed before the primary lever can be opened, eliminating the risk of accidental release during riding.

Q: Can we customize the component specification to hit a specific retail price point?

A: Yes. As an OEM manufacturer, drivetrain components (e.g., shifting systems, brakes, tires) can be substituted with alternative tiers (such as microSHIFT or Shimano components) based on your target market requirements.

Q: What is the shipping volume per unit for container load calculation?

A: Each boxed unit displaces approximately 0.25 CBM. A standard 40-foot high-cube container accommodates 420 units packaged in individual export-grade cartons.

Q: How do you handle warranty claims and spare parts supply for bulk orders?

A: We supply a 3-year warranty on the frame structure and 1-year on mechanical components. Additionally, we provide a 2% allocation of fast-moving spare parts (cables, brake pads, pedals, derailleur hangers) free of charge with every bulk production run.

Q: What documentation is provided with each shipment for customs clearance?

A: Each shipment includes Commercial Invoices, Packing Lists, Bill of Lading, Certificate of Origin (Form A / CO upon request), and individual frame testing inspection sheets linked to batch serial numbers.