Vivi Gopina 350W Fat-Tire Folding Mini E-Bike

The 350W rated rear hub (700W peak, 50 Nm) is the smallest motor in Vivi's line, but it's pushing the smallest bike: 16" wheels gear a hub motor short, which on paper favors quick launches even at modest watts. The spec table lists pedal assist to 21.7 mph and the half-twist throttle capped at 15.5 mph. That combination does not fit the three-class system cleanly. The assist runs past the 20 mph ceiling of Class 1 and Class 2, and most state statutes define Class 3 as pedal-assist only, with no throttle, so a throttle bike with 21.7 mph assist has no clean class as described, even though the throttle itself stops at 15.5 mph. If the display lets you cap assist at 20 mph, it would meet the Class 2 speed limits. Riders in Class-3-restricted states especially should check their state's wording. A 350W rated motor clears all state power limits with room to spare.

Vivi claims 40-50 miles. The removable pack is 48V 7.8Ah, so 374 Wh ÷ 18 Wh/mi (a fair burn rate for a small, slow-geared bike) ≈ 21 miles of mixed assist; heavier throttle use pulls it under 18. The 40-50 figure needs single-digit watt-hours per mile, which no throttle-equipped 69 lb bike achieves outside a lab. Plan on 18-24 miles, entirely adequate for the short-hop city role this bike is shaped for, and the pack pops off for desk or apartment charging.

The pleasant surprises: a lockable front suspension fork (most sub-$500 folders are rigid), 3.0" wide tires that soften the small-wheel ride, integrated wheels, and the step-thru frame option at the same price tier, genuinely rare this cheap, and the right call for shorter riders or anyone carrying groceries. The visible economies: 16" wheels limit obstacle rollover (curbs demand respect), the drivetrain and brakes are entry-tier, and at 69 lb with battery it out-weighs the 26" Jasion EB5 (50 lb) by about 19 lb, so the fold helps it fit a trunk rather than carry up stairs. Certification is the line to keep: Vivi's spec sheet names SGS-tested UL 2849 (the Amazon listing says UL-certified without the lab). It is no longer rare under $500, since the RPINT Mini 14 and Funhang EB-M1 document it with SGS named too, but it is the standard NYC Local Law 39 requires for any e-bike sold, leased or rented in the city, and one many buildings ask for before indoor charging.

Buy the Gopina if you want the cheapest certified path into e-biking, need a step-thru frame, or your riding is short urban hops where a small folded footprint beats range. RV owners and trunk-commuters are the natural fit. Skip it if your rides exceed ~20 miles (F26FUL for range), you're taller than about 6' (16" wheel cockpits run small, and the MT26GUL is the full-size step-thru, though Vivi sizes it only to about 6'1"), or you'd rather pay less for a full-size 26" hardtail that does not fold (the Jasion EB5).