Brompton C Line 12-speed Specifications

The Brompton 12-Speed folding bike combines a compact fold, wide gearing range, and classic steel ride quality—making it one of the most versatile commuter bikes available in Canada.

Brompton C Line 12-Speed Folding Bike Specifications

Key Specifications

• Weight: From 12 kg (26.5lbs)

• Gearing: 12-speed

• Drivetrain Range: 402%

• Frame Material: Steel

Folded Dimensions

• Folded Size: 25.3" H × 23" W × 10.6" D
  (Ideal for apartments, offices, condos, and public transit across the GTA, Southern Ontario and cities across Canada)

Frame & Fork

• Main Frame: Precision-drawn, heat-treated steel tubing with hand brazing and selected auto-brazed joints

• Rear Frame: Brompton Advance Rear Frame

• Fork: Steel brazed fork

Cockpit & Contact Points

• Grips: Lock-on grips with soft-compound rubber bonded to an engineered core

• Seatpost: Standard black seatpost (33")

• Saddle: Standard Brompton saddle

• Seat Clamp: Composite seat clamp with integrated rear frame clip

• Hinge Clamps: Composite hinge clamp levers

Drivetrain & Gearing

• Drivetrain: Brompton 12-speed system

• Shifters: Brompton 4-speed derailleur shifter + 3-speed internal hub shifter

• Derailleur: Patent-pending direct-mount 12-speed derailleur

• Sprockets: 11–18T

• Chainset: 6061 forged aluminum crank with 50T chainring and integrated chainguard

• Bottom Bracket: Square taper

Wheels & Tires

• Front Wheel: Double-wall rim, 28 spokes, Brompton front hub

• Rear Wheel: Double-wall rim, 28 spokes, Brompton wide-ratio 3-speed internal gear hub

• Tires: 349 × 35C Schwalbe Marathon Racer

  • Puncture-resistant casing

  • Reflective sidewalls for urban visibility

• Tubes: Schrader valve

Braking & Safety

• Brakes: Brompton dual-pivot caliper brakes

• Lighting: Reflectors included

• Mudguards: Included (standard)

Carrying & Accessories

• Front Carrier: Front carrier block adaptor compatible with all Brompton luggage

• Pedals: Brompton folding left-hand pedal and non-folding right-hand pedal

• Roller Wheels: Brompton Advance Roller Wheels

• Rack: Not included

• On-Bike Accessories: Brompton bell

Disclaimer

• Specifications: Subject to change without notice