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Tern BYB S11 folding bike side view
Tern BYB S11 folding bike side view
Tern BYB S11 folding bike shown folded

Tern BYB S11i

BYB S11i


The Tern BYB isn’t just a folding bike – it’s a whole new way to fold a bike. It’s 30% smaller than traditional 20″ folding bikes, and folds small and slim enough to fit conveniently into lockers, closets, or any narrow space.

Why do we love this bike?

  • Small & compact
  • Fast & stable riding
  • Fits conveniently into lockers, closets or any narrow space
  • Uni-size – adjusts to fit riders from 147 to 195 cm (4’10” – 6’5”)
  • Easy-to-use trolley system & built-in spinner wheels for transport

Temporary promotion: Buy two and get 5% off your bike order. 

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The Tern BYB S11i model features:

  • 30% smaller than traditional 20” folding bikes
  • Fits conveniently into lockers, closets, or any narrow space
  • Metro Transit Rack with built-in spinner wheels for easier trolleying
  • Fits riders from 147 to 195 cm (4’10” – 6’5”)
  • New TFL Joint with 3D interface, DeadBolt design and SpringLock technology
  • New 3D-forged Physis RF Handlepost
  • Kinetix Pro X wheels with paired spoke technology
  • 11-speed Shimano Ultegra, Shadow RD derailleur

When folded, the BYB has one of the smallest footprints of any folding bike. That means a much easier time maneuvering it onto crowded trains and buses or when navigating through busy office buildings. The BYB is designed for mixed-mode commuters who do a stretch of their daily journey on a train or bus, or might grab a taxi home on a rainy day. Folded, the BYB fits anywhere so all your transport options are always open.

The best things in life are shared, including your commuter bike. The BYB has a low-step frame design and resizes in seconds—no tools required—to fit riders between 147 and 195 cm (4’10” – 6’5”), so you can share the bike with anyone in your family.

The Tern BYB S11i comes with TriFold technology - a patented new way to fold a bike smaller while delivering a quality ride.

Additional information


Tern Bicycles