Best 20-inch folding fat tire electric bikes under $350

Top pick: the SYX MOTO 20" Fat Tire Electric Bike — it's the only one here that's genuinely all three things you asked for: a foldable aluminum frame, true 20"×4.0 fat tires and a 350W Bafang motor, with a lockout suspension fork for rough pavement and gravel. If you want a folding fat-tire e-bike at this price, this is the one to start with.

Who the others suit:

• VIVI Gopina — best if you mainly want a well-reviewed, easy-to-live-with folder and can live without fat tires and 20" wheels.
• ASKGO 750W — for riders who want the most motor for the money and don't mind a heavier, plainer folder; ratings are middling.
• UPlee GS5 — a compact folding option for light errands and short hops.

Two things worth knowing at this price: fat-tire folders are heavy (expect 60 lb or so), and battery range claims are optimistic — plan on shorter assisted rides than advertised. Check the frame and hinge welds on arrival, and confirm the battery is UL-certified before charging indoors.