Those Vtuvias are sold under several names on Amazon or Ebay. I just got an SK off ebay called a WTVA. (750W, 13AH) They are well made. With the wheel off the ground mine says it's turning at 33 mph using the throttle only. I weigh 260 and it seems to tolerate the weight. Not many miles yet, today I'm installing tire liners and Armor-Dilloz sealant. Being old, I don't hurry. I just Slog along at my own pace.
I should mention that this WTVA bike I have is not a 750W bike. It is a 500W. I haven't taken out the controller for a look, but the specs call it a 20A. I changed the parameter for current limits to 16 (from 12) to take advantage of its "750" watt rated motor, then rode it. With the display monitoring current it never exceeded 12. 12A at 48V = 576W, an appropriate limit for a 500W motor. The parameter change is ignored by the controller which is apparently hard wired for 12A, and is probably a 15A controller.
These sellers have the morals of alley cats. Just know that false claims are made about these bikes.
It did accelerate well to 25.4 mph and was still increasing slowly a couple tenths at a time, after a measured 120 yards. Not really bad since I weigh over 260 pounds. But not a 750, either.
I have 25 miles on the WTVA folder now, and want to give credit where it is due. While the bike is 500W, it really does have all the power I need and I am a large, ape-like rider. With me on it it has a real top speed of 28.6 mph (throttle only) and the 13AH battery is capable of pretty good range. A lighter rider would probably hit 30.
I keep a log of rides, voltages and recharging. I opened up the controller plate and took a look, it claims it is a 35A...(more lies)
I doubt the motor lead is 12 gauge wires which would be needed to handle 20A and stay cool, so 12 amps is just how it rolls.
Today I was trying to drain off what was left of the current charge so I made laps around some open, flat roads for a couple miles at full throttle.
Even as the battery was reaching the end it still hit 25 mph with ease. This was after 5 rides, a total of 24 miles logged. I mix it up out riding, sometimes pedaling along at 10 or 11, mostly pretending to pedal and cruising at about 17. The indicator was flashing one square under power, recovering to two after a few seconds of coasting. (It has six bars total)
There is a 1/3 mile grade on a bike trail here, and it pulls it happily never falling below 15 mph.
The bike itself is quiet, no rattles or grinding noises. After some re-working of the brakes they are about perfect. It has a sort of cruise control, too.
You can choose a trip meter, current, volts, or elapsed time on the display with stabs at the M button.
There is a pulsing whine from the hub gears, but I guess that is normal. ?
All in all, for 1299 you could do worse than these Vtuvia (WTVA) bikes.
I painted the rear fender gloss black to better match the Lectric XP front fender I put on it. The one it came with was tragic.
The bag is from Amazon, a Mariso. I've also used some spiral wrap on that mess up front- they put the derailleur cable on the wrong side for neatness and I'm too lazy to switch it since it works.
The mirrors were $22 for both on Amazon, too. They are really important for me. I hate getting run over by lunatics.
That little black and white thing is my Boston Terrier, Roxanne.