Best 20-inch folding electric bikes with fat tires under $400

Top pick: SYX MOTO 20" Fat Tire Electric Bike — the only one here that truly ticks every box: a foldable 6061 aluminum frame, 20" x 4.0 fat tires, a 350W Bafang motor and a lockout suspension fork. Bafang is a known motor brand, which matters more than spec numbers at this price.

If you want more power: the Aostirmotor 20" fat-tire folder (500W, 36V 13Ah removable battery, UL2849-certified) — the white version has the better owner ratings.

If you want the most proven feedback: the Vivi 20" x 2.4 folder has the strongest review record, but its tires are narrower than true fat tires.

Skip the rest: they're either not 20-inch, not fat-tired, or not folding.