DYU has sold more than 5,000 units of the D3S in a single year, and the appeal is easy to understand once you see how small it folds. At 14 inches, this is one of the more compact electric bikes on the market, small enough to carry onto a subway, tuck into a car trunk, or store in an apartment without dedicating real floor space to it.
It's built to be 100% EU street-legal with no throttle, power comes through pedal assist only, delivered by a 250W motor and 36V 10Ah battery good for up to 50km of range. A walking-assist mode (up to 6 km/h) helps when you're pushing it up a curb or through a crowded space without fully dismounting.
At 19kg with a 120kg load capacity, it's light enough to actually carry when folded, while still supporting most adult riders comfortably.
Who it's for: city commuters who need a bike that folds small enough for public transit or tight storage, and who value legal compliance over raw speed.
Bottom line: at €499 (down from €749), this is one of the more affordable ways into a genuinely compact, legally compliant e-bike, especially for commutes that mix walking, transit, and short rides.
