Tern BYB S11 Folding Bike


The Tern BYB S11 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.

Our take on the Tern BYB S11 Folding Bike
  1. Folding
  2. Derailleur Gears
  3. Urban
  4. Equipped

Once you have purchased your new bike from us, it will be put into the build queue for one of our workshops. Your bike will be built and will undergo a Pre Delivery Inspection (PDI) by one of our expert mechanics. A PDI is a checklist that the mechanic follows to confirm that all parts of your new bike are up to our high standards.

Next, your bike will be prepared for shipping. Padding is used on all the necessary areas and your bike is loaded into a sturdy cardboard bike box. All the necessary paperwork and accessories will be packed inside too. Most of our cardboard and packaging are recycled from incoming deliveries. Bikes are usually delivered by DPD within the UK.

In order to package your bike safely, you will need to do a small amount of assembly when it arrives. It can vary from bike to bike, but usually you’ll need to: fit the front wheel, install the handlebars and fit the pedals. Please note that not all bikes come with pedals - please check the specification on each bike, we’ll include it on there.

More Information
Colour Matte Silver
Frame Aluminium, TriFold patented technology, EFBE tested: ISO 4210
Fork Tarsus, 6061-AL, Hydroformed
Wheels Kinetix Pro Disc, Shimano Centerlock
Tyres Schwalbe Marathon Racer, 40-406, puncture protection, Reflex
Shifters Shimano Ultegra, 1 x 11 spd
Front Derailleur N/A
Rear Derailleur Shimano Ultegra, Shadow RD
Crank Crankset, FSA Gossamer Pro, 54T MegaEVO BB386
Cassette Shimano 105, 11-32T
Chain Shimano, 11 spd
Brakes Tektro V, swivel link, race pad
Saddle Ergon SMC30 Pro, TiNox Rails
Seatpost Tern Telescope, 34.9/30.9 mm, 2014-AL
Handlebar Tern Telescope, 34.9/30.9 mm, 2014-AL
Stem Tern Andros (G2), adjustable, forged construction, patented technologyy
Accessories Mudguards, rack and kickstand

Accessories delivery

We ship accessories Monday - Friday and aim to dispatch all orders within 2 days of receiving them. Free shipping orders are sent with Royal Mail and for bulky items, we may use DPD (at no extra cost).

Bikes delivery

In stock bikes are usually shipped within 14 days of you ordering as they undergo a Pre Delivery Inspection before dispatch. Bikes are delivered by DPD who provide a delivery window via text message on the day. Some electric cargo bikes are not available for delivery. They are, however, available for click and collect.

Click & Collect

We can arrange for all items to be collected from store. For items other than bikes this usually takes 2 - 4 working days. Bikes can take up to 14 working days to be available. We’ll let you know when items are ready for collection. Please bring a form of ID and a bank card with you when you pick up your order.


We accept returns on orders up to 14 days after the items arrive with you. All accessory returns should be in saleable condition and be sent to our Hackney address with a note which has your name and order number on it. Refunds are processed within five working days.

International Shipping

International delivery charges are estimates and are subject to change. Please contact us for more information.

Product Description

  • 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

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