In-depth review
What it's like to own
The S4 is a mini folding e-bike: 16 in wheels, a 350 W motor limited to 15.5 mph and a 281 Wh battery. It fits in small apartments and car trunks, and the adjustable bar and seat suit teens and smaller adults.
Range is the limit — Gotrax claims 28 miles with pedaling and 15.5 on throttle alone, so expect about 10–15 miles in real use. The front fork helps a little on small wheels.
It's UL 2849 certified and sold by Amazon. About 1 in 8 ratings are one-star, mostly units that failed early.
