• 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
BYB S11 - ultra compact folding bike
  • 20" wheels
Around Town
Top-Tier

Product Reviews

I like bike designs that can be altered to fit a variety of body shapes and sizes and the BYB is just that. Being in the riding position that you want means you are half way to a comfortable and efficient ride before you even pedal.

Freewheeling France

The Tern BYB S11 is a great addition to the choice of folders out there, and a genuinely novel addition to the annals of folding bike design.

Seven Day Cyclist

Specifications

General Info
Speeds:
1 x 11
Weight:
12,7 kg (28 lb)
Gear Inches:
32" - 94" (2.57 - 7.48 m)
Folding Size:
33 × 81 × 51 cm (13 × 31,9 × 20,1 sisällä)
Folding Time:
30 seconds
Frame Sizes:
One size
Distance: Seatpost to Handlebar:
63 - 67,5 cm (24,8 - 26,6 in)
Suggested Rider Height:
147 - 195 cm (57,9 - 76,8 in)
Max Gross Vehicle Weight:
120 kg (264,6 lb)
Max Rider Weight:
105 kg (231,5 lb)
Frame
Frame:
Tern BYB, Aluminum, TriFold patented technology, EFBE tested: ISO 4210
Fork:
Tern Tarsus, 6061-AL, hydroformed
Cockpit
Handlepost:
Tern Physis RF, 3D forged, 5 patented technologies
Stem:
Tern Andros (G2), adjustable, forged construction, patented technology
Headset:
Flux Pro, angular contact bearings, Physis integrated
Handlebar:
Kinetix Pro X, double-butted 7050-AL, Andros adapted
Grips/Bar Tape:
Ergon GS1 Leichtbau
Saddle:
Ergon SMC30 Pro, TiNox Rails
Seatpost:
Tern Telescope, 34.9/30.9 mm, 2014-AL
Seatpost Clamp:
Oversize, 6061-AL, 2pc
Brakes
Front Brake:
Tektro V, swivel link, race pad
Rear Brake:
Tektro V, swivel link, race pad
Brake Levers:
Shimano
Brake Cable & Housing:
Jagwire, anti-compression housing, slick cables, Slick Lube liner, alloy ferrules
Wheels
Front Wheel:
Kinetix Pro X, Paired Spoke technology, straight-pull design, 16H
Rear Wheel:
Kinetix Pro X, Paired Spoke technology, straight-pull design, 16H
Tires:
Schwalbe Marathon Racer, 40-406, puncture protection, Reflex
Transmission
Shifter(s):
Shimano Ultegra, 1 x 11 spd
Front Derailleur:
n/a
Rear Derailleur:
Shimano Ultegra, Shadow RD
Crankset:
Crankset, FSA Gossamer Pro, 54T MegaEVO BB386
Cassette/Freewheel:
Shimano 105, 11-32T
Bottom Bracket:
FSA, BB-EVO8681
Chain:
Shimano, 11 spd
Pedals:
MKS UB-LITE EZY
Shifter Cable & Housing:
Jagwire LEX-SL, slick treatment, alloy ferrules
Bells & Whistles
Bell:
Pitch, brass
Chainguard:
Hebie
Kickstand:
Premium center mount
Clip System:
Anchor Bolt
Luggage Socket:
Combo Mount
Fenders:
SKS, stainless hardware
Rack(s):
Tern Metro Transit Rack; Max load weight: 20 kg (44 lb)
Accessory:
Pedal Holder

*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.