The Tern BYB has a wide height range of 4’10” to 6’5”.
Tern's Andros stem allows quick adjustments to handlebar position.
Reviewers praise the compact folded dimensions (13” x 31.9” x 20.1”).
The BYB's maneuverability and “superb” handling impress testers.
Owners enjoy the comfortable riding position.
Experts compliment the precise shifting and ample gearing range of the Shimano Deore 10-speed (P10) and Ultegra 11-speed (S11) drivetrains.
Reviewers say the BYB accelerates swiftly and rides relatively fast on its 20" wheels.
Climbing feels easy with the Tern BYB, according to testers.
Testing shows the Tektro V brakes (S11) deliver "sharp" stopping power.
Numbered lines on the seatpost make height adjustments simple.
Experts say both the TriFold hinges and anchor bolt securing the folded bike work well.

6 reasons not to buy

The Tern BYB is considered pricey.
Testers say the folding process is time-consuming and “takes some practice” to master.
One expert finds the welds rough and the long cables inelegant.
The BYB P10 lacks fenders, a rack, and a chain guard.
Reviewers mention that the BYB S11's plastic chain guard sometimes needs adjusting.
A few testers say the rear rack's built-in wheels (S11) make the folded vertical position slightly unstable and awkward to roll backward.

Bottom line

The Tern BYB is a 20" folding bike available in two builds, S11 and P10. The more expensive S11 has commuter accessories; the cheaper P10 is simpler and lighter. Experts and owners praise the bike's compact design, balanced handling, comfortable riding position, and quality Shimano drivetrains. Additionally, the 20" wheels deliver a fast and stable ride compared to 16" alternatives. Testers say the BYB offers excellent urban practicality, but it's expensive and has a relatively complex folding process. Some reviewers also complain about rough welds and inelegant cabling. But overall, the Tern BYB seems a good folding commuter option.

Expert Reviews

77/100 based on 4 rated expert reviews

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BikeRadar

Level 5 expert

Tern BYB S11 Review

Level 5 expert

If you’re after ride quality, it’s one of the best-handling folders around.

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Wired

Level 1 expert

Review: Tern BYB

Level 1 expert

The high price tag is probably worth it for the multimodal commuter.

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Transition Vélo

Level 3 expert

Test – Tern BYB P10, the 20″ Folding Bike With a Sporty Feel [French]

Level 3 expert

… the BYB P10 rides well; very well, even. Light, rigid, giving the possibility of having a semi-sporty position if you wish, it is a bike with which you will be able to move quickly and, even better, have fun.

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Weelz!

Level 1 expert

[Test] Tern BYB S11, a Folding Bike Full of Enthusiasm [French]

Level 1 expert

Despite small minor design flaws (cabling, welding, etc.), the overall line of the bike is very successful… the BYB in its S11 version is undoubtedly an excellent bike.

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Bicycling

Level 5 expert

The Tern BYB (Bring Your Bike) Rides Big and Folds Small

Level 5 expert

The Tern BYB is a fun, sturdy bike that’s a cinch to fold and unfold. It rides as comfortably as a regular-framed hybrid bike and stores like a suitcase.

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Časopis Cykloturistika

Level 1 expert