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Tern BYB S11 on testCompact aluminium folding bike with sporty aspirations

Timo Dillenberger

 · 21.10.2024

Tern BYB S11 folding bike test
Photo: Tern
The Tern BYB S11 folding bike comes with sporty features and a lightweight aluminium frame. How does it perform in urban use and what are the strengths of the folding bike from Tern?

At 330 x 810 x 510 mm when folded, the Tern takes up slightly more space despite having the same wheel size, but it is a good kilo lighter thanks to its aluminium frame and sporty wheels. With a little practice, we managed to fold and unfold the bike in under 50 seconds. Brompton G Line 8-speed slightly faster, but it has two fewer levers.

With Tern, the folding hinges are closed using a clamping lever. This works quickly, safely and with even less force than with the Brompton.Photo: Timo DillenbergerWith Tern, the folding hinges are closed using a clamping lever. This works quickly, safely and with even less force than with the Brompton.

On the other hand, there is no need for manual force, as the Tern's clamping levers engage without pressure, and the carrier for the right pedal on the frame is ingenious. The double-strut construction of the frame gives the bike a lot of rigidity, riders up to 105 kilos can take a seat, the standard luggage rack is approved for up to 20 kilos.

You can find out more about folding bikes here:

>> The new Brompton G-Line as a 20-inch folding bike for all occasions

>> Folding and compact bikes in the test: Mobile on small wheels

>> Tern presents the smallest folding bike in the company's history

Tern BYB S11 folding bike: telescopic support and sporty features

Tern specifies 1.47 m to 1.95 m as the ideal rider height, which is quite realistic thanks to the forward-adjustable stem and the double telescopic seat post.

More variable: The two levers allow the height of the stem to be adjusted, reducing the pack size and increasing seating comfort.Photo: Timo DillenbergerMore variable: The two levers allow the height of the stem to be adjusted, reducing the pack size and increasing seating comfort.

It's precisely this forward lean that makes this bike sportier - that and the lighter wheels with road tyres. You accelerate more quickly than on the Brompton, both are similarly lively to steer, but when it comes to hard braking, the British bike has the absolute upper hand. Although the V-brakes on the Tern are reliable and sufficient in themselves, the bite and modulation of the discs is kilometres ahead. For heavy riders or with a load, the great strength of the Tern with its road bike gearing - sportiness and speed - could become a problem here.

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Both pedals can be removed using a quick-release coupling, and there is a special holder on the frame for the left pedal - very practical!Photo: Timo DillenbergerBoth pedals can be removed using a quick-release coupling, and there is a special holder on the frame for the left pedal - very practical!

Conclusion on the Folding bike Tern BYB S11

On a par: The Tern has a lot to offer for purely urban use and is cheaper when adjusted for equipment. In terms of the ratio of folding size to riding characteristics, the brakes ultimately tip the balance in favour of the Brompton G Line.

Technical data of the Tern BYB S11

Tern BYB S11 folding bike testPhoto: TernTern BYB S11 folding bike test
  • Price: 2,699 Euro
  • Weight: 12.8 kg
  • Frame: Aluminium frameset with 3 folding mechanisms, front luggage mount
  • Drive: Shimano Ultegra 1 x 11 derailleur gears
  • Brakes: Tektro V-brakes
  • Tyres: Schwalbe Marathon Racer, 406 x 40 mm
  • Special features / accessories: Side stand, pedal holder, adjustable stem, ergonomic grips, transport wheels, optional soft cover and transport box
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