Castro Duo

The Simple One
$500

Simple is a bike that gets you from where you are to where you’re going. Simple is two speeds – one for flats and one for hills. Simple is a coaster brake and no cables. Cool is automatic shifting and a ten-second fold.

  • Integrated lighting with electricity-generating hub
  • Andros™ handlebar stem for tool-free riding position adjustments on the fly
  • Chain guard protects your clothes from grease and dirt
  • Integrated yet detachable rear rack for hauling cargo
  • Full fenders for rainy days
  • Comfy Schwalbe Big Apple tires with Kevlar puncture protection
  • Folds compactly in 10 seconds for storage and transport
  • 24" wheels
Around-Town
Mid-Range

Product Reviews

Tern beweist auch beim Castro Duo seinen Innovationsvorsprung. [With the Castro Duo, Tern proves it's a leader in innovation.]

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Specifications

General Info
Speeds:
2
Weight:
14.1 kg (31.1 lb)
Gear Inches:
57" - 78"
Folding Size:
400 × 840 × 810 mm (15.7 × 33.1 × 31.9 in)
Folding Time:
10 sec
Frame Sizes:
One size
Distance: Seatpost to Handlebar:
60 - 74 cm (23.6 - 29.1 in)
Distance: Saddle to Pedal:
77 - 104 cm (30.3 - 40.9 in)
Suggested Rider Height:
148 - 195 cm (58.3 - 76.8 in)
Max Load Weight:
115 kg (253.5 lb)
Frame
Frame:
Castro, 6061-AL, patented OCL Joint and DoubleTruss technology
Fork:
Integrated, hi-tensile steel
Cockpit
Handlepost:
Physis T-Bar, 2D forged aluminum, 4 patented technologies
Stem:
Andros, 3Djust technology, Norglide bearings
Headset:
Flux, cartridge bearings, Tri-seal technology
Handlebar:
BioLogic Crescent, 6061-AL
Grips/Bar Tape:
BioLogic Ergo, kraton
Saddle:
BioLogic Como DLX
Seatpost:
SuperOversize, 6061-AL, casted clamp
Seatpost Clamp:
SuperOverize, 6061-AL
Brakes
Front Brake:
V, aluminum, linear spring
Rear Brake:
SRAM coaster hub
Brake Levers:
V, aluminum bracket/lever
Brake Cable & Housing:
Anti-compression housing, slick cables
Wheels
Front Hub:
Formula, aluminum
Rear Hub:
SRAM Automatix, 2 spd.
Spokes and Nipples:
Stainless steel, brass nipples
Rims:
Aluminum
Tires:
Schwalbe Big Apple, 50-507, puncture protection, Reflex
Transmission
Crankset:
Cold-forged 6061 aluminum crank arms, hand-polished
Cassette/Freewheel:
SRAM for hub gear
Bottom Bracket:
Semi-cartridge
Chain:
408H, 3/32"
Pedals:
Suntour folding
Bells & Whistles
Chainguard:
Full chainguard
Kickstand:
Premium double, aluminum
Clip System:
Magnetix 2.0
Luggage Socket:
Yes
Front Light:
Valo
Rear Light:
Optional: Deluxe Rear Light
Fenders:
RP, stainless hardware
Rack(s):
Integrated

*Note: These are our standard model specifications. The bike's weight and folded dimension may not include racks and fenders. The specifications for your country may differ slightly. We do our best to ensure that the specifications listed here accurately reflect the exact parts found on our production bikes. However, component changes do occur for various reasons and there may be brief delays on site updates. We reserve the right to make component changes without prior notification, which may cause discrepancies with the information listed on the web.