VIVI ACE01 review: torque assist, 720Wh and a weight conflict

Motor, battery and rated range

VIVI lists a brushless hub motor at 1500W peak and 90Nm. It does not publish a nominal wattage, so 1500W must stay attached to the word peak. The 48V, 24A controller does not provide enough information to invent a continuous motor rating, and the missing figure remains TODO: verify.

The removable battery is specified at 48V, 15Ah and 720Wh. A 54.6V, 3A charger is included, with four to six hours listed for charging. VIVI says the battery can be charged on or off the bike.

There are two range bands on the official table: 28 to 34 miles in pure-electric use and 34 to 60 miles with pedal assist. Both are manufacturer-rated. VIVI does not state a complete test protocol covering rider mass, speed, assist level, terrain, temperature and tire pressure. The upper number is therefore not presented here as real range.

Weight, load and fit

Weight is the page’s clearest documentation problem. The Performance section lists bicycle weight as 33 kg or 72 lb. The Geometry section later lists 43 kg or 95 lb with battery included. Earlier, 43 kg or 95 lb is also the stated package weight. Those entries cannot all describe the same thing, so choosing 72 lb would be unjustified and choosing 95 lb would be equally uncertain.

The load figures are clearer. VIVI publishes a 330 lb maximum for the bicycle and a separate 55 lb capacity for the integrated aluminium rear rack. The rack allowance sits inside the total load, not on top of it.

Fit guidance spans riders from 5 feet 3 inches to 6 feet 5 inches, with an adjustable seat height of 32.3 to 38.6 inches and a 30.3-inch standover. Because the frame is high-step and does not fold, prospective buyers should compare those official dimensions with a bicycle that already fits.

Assist, drivetrain and braking

The ACE01 uses a torque sensor rather than a basic cadence trigger. A torque sensor measures pedal effort and requests proportional assistance, while five assist levels determine how much support is available. That describes the control method, not the smoothness of its tuning, which has not been assessed here.

Mechanical gearing is a Shimano 1 x 7 setup with an 11-to-28-tooth freewheel and a 42-tooth chainring. VIVI lists regular speed at 20 mph, maximum speed at 25 mph and the e-bike class as Class 2. Because classification rules vary and a 25 mph maximum sits above the usual Class 2 assist cutoff in many US jurisdictions, buyers should confirm the delivered settings and local rules.

Braking is by front and rear hydraulic discs with 180mm rotors and motor-cutoff levers. The page identifies the hardware but publishes no stopping-distance, heat or wet-braking test. Those outcomes cannot be inferred from rotor diameter alone.

Tires, frame and equipment

The aluminium high-step frame carries 26 by 4-inch, 30 TPI fat tires on double-wall aluminium rims. VIVI describes them as anti-puncture, but no test standard or puncture-protection layer is specified. Tire pressure is also absent from the product page, so the official manual and tire sidewalls should govern inflation.

The fork is listed with 100mm travel, lockout and adjustment. Full-coverage fenders, a kickstand and the rear rack are included. At the front, VIVI lists an integrated 48V LED headlight. At the rear it lists a quick-release reflector, not a powered tail light or brake light, an important distinction for buyers planning low-light use.

VIVI lists IP54 and states SGS certification to UL 2849 and UL 2271 on the official page. This review records those as manufacturer-published statements; it has not independently authenticated a certificate or tested ingress.