VOMO CS20: 540 Watt-Hours, and the Brand Table Says 27.5, Not 28

The VOMO CS20 is a step-through city bike with a rear hub and a skinny tire. It is not a 28-inch bike on the only spec table the brand prints, and it is not the ESTRAPZ CS20. VOMO’s product page, vomoebike.com, opened 22 October 2026, is out of stock at $726, from a compare-at of $1,452. The table says a 36-volt 15-amp-hour lithium-ion battery, a motor rated 36 volts and 250 watts, a steel frame, a 27.5-by-1.95-inch tire, 25 km/h, and a throttle range of 40 to 50 km. Thirty-six times 15 is 540 watt-hours. The page never writes that watt-hour. Twenty-five kilometers an hour is 15.5 mph. A Danish shop card in the same day’s search says 48 volts, a 26-by-1.75 tire, and 90 newton-meters. This is a desk comparison of those cards. It is not a SickEBike ride.

What the brand table prints, and what the other cards print

The brand table is the only block this desk opened. It does not say Class, UL, CE, Shimano, or a sensor. The about page on the same domain says the brand was established in 2021 by Shenzhen Newxinxing Technology, and it spells a quality line “IOS9001.” That spelling is theirs. It is not a UL 2849 mark, and it is not on the CS20 table. Shop the table. A factory listing that borrows the model number is not a second button.

Thirty-six times fifteen is 540. Forty-eight times fifteen is 720.

Thirty-six times 15 is 540. The brand table prints the volts and the amp-hours and never the watt-hour. Use 540 when you are on that table. The Danish card prints 48 volts and 15 amp-hours. Forty-eight times 15 is 720. A factory card that says 36 volts and 10.5 amp-hours is 378. Thirty-six times 10 is 360. Those are four tanks. The watt-hour page is the multiplication. The battery page is why a 18650 line on a Dutch card is a cell size, and why the brand table’s “lithium-ion” does not name Samsung, LG, or Panasonic. Four and a half kilograms is the battery row. It is not the 28-kilogram bike.

The brand charger is not given in amps. The charge line is 6 to 8 hours. Five hundred forty divided by 8 is 67.5 watts. Divided by 6 it is 90 watts. A 36-volt, 2-amp brick is 72 watts, and 540 divided by 72 is 7.5 hours, which can sit inside 6 to 8. The Danish card does print a charger: 100 to 240 volts at 2 amps, and a charge of 3 to 6 hours, on a 48-volt 15-amp-hour pack. Forty-eight times 2 is 96 watts. Seven hundred twenty divided by 96 is 7.5 hours before the taper. Three hours at 96 watts is 288 watt-hours. Six hours is 576. Neither is 720. The charging page is why a 2-amp brick does not refill a 720 watt-hour pack in three hours. Do not move that 2-amp sentence onto the brand table, which never prints it.

The brand tank is 540 watt-hours. The Danish card’s tank is 720. A 28-inch wheel and a 27.5-by-1.95 tire do not share a bead. Do not average the bikes into one.

Fifteen and a half miles an hour can be a class. A 6 km/h throttle is a different part.

Twenty-five kilometers an hour is 15.5 mph. Two hundred fifty watts is under 750. 15 U.S.C. § 2085 is pedals, a motor of less than 750 watts, and motor-only speed under 20 mph. On the brand numbers alone, this card can sit inside that federal line, and a throttle that tops out at 15.5 mph can sit inside a US Class 2. It is not a Class 3. The brand table never says Class. The US law pillar is the state layer under that federal line. A sticker the table does not print is not a sticker you can ride on.

Europe is a different sentence. An EPAC is 250 watts and 25 km/h with assist while you pedal. A throttle that takes you across town is not the 6 km/h walk assist shops call legal. Sportdeal’s 2025 title says the throttle stops at 6 km/h. The brand table gives that throttle its own range, 40 to 50 km, which is a riding mode. The Danish card says “CE” and “legal on the public road.” That is the shop’s sentence. This desk did not open a certificate. Do not tell a European buyer the brand’s throttle range is the walk assist, and do not tell a US buyer the Danish road-legal line is a Florida class sticker.

Eighty kilometers is the pedal cell. Fifty is the throttle cell.

The brand table splits range. Throttle mode is 40 to 50 km, about 25 to 31 miles. Pedal assist is 70 to 80 km, about 43 to 50 miles. Five hundred forty divided by 50 km is 10.8 watt-hours a kilometer. Divided by 40 km it is 13.5. Divided by 80 km it is 6.8. Divided by 70 km it is 7.7. On a skinny tire, at a 15.5 mph cap, 11 to 14 watt-hours a kilometer on the throttle is a claim that can sit next to a light city bike. Under 8 watt-hours a kilometer on assist is the gentle end. The table does not say the rider, the assist level, or the wind. The range page is why those three move the miles. E-BIKE 58’s “up to 60 km” on a 36-volt 15-amp-hour pack is 9 watt-hours a kilometer, and it does not say throttle or assist. The Danish “up to 60 km” is on the 720 watt-hour card, which is 12 watt-hours a kilometer. Sixty on 720 is not 80 on 540.

The tire is the other range part. A 27.5-by-1.95 is a skinny city tire. A 28-inch, in bicycle sizes, is a 700c, bead 622. A 27.5 is a 650b, bead 584. The tire guide is why those do not share a tube, a rim, or a gear inch. The brand table says 27.5 by 1.95. E-BIKE 58 says 28 inch and does not give a width. Sportdeal says 27.5 by 1.9. The Danish spec row says 26 by 1.75 and tubeless, and a paragraph on that card says 27.5. Buy the wheel in the photo of the bike you are paying for. A “28-inch skinny commuter” is a fair description of the category. It is not what VOMO’s own table says.

The hub is 250 watts. Ninety newton-meters is not on that table.

The motor on every card this desk read is a rear hub, rated 250 watts. The hub page is why that motor does not use the gears the way a mid-drive does. The brand table does not say Shimano. The Dutch and Danish cards do, and they say 7-speed. The motor page is rated versus peak. This brand table has a rated line and no peak. Do not invent one.

Torque is the hole. The brand table has no newton-meter. The Danish card says 90. Factory cards under the same model number say 30 to 50, 60 to 70, or 70 to 80. Ninety is not 40. If 90 newton-meters is at the axle, 250 watts divided by 90 is about 2.8 radians a second, about 26 revolutions a minute at the wheel. On a 27.5 wheel that is a walking speed. So 90, if it is real, is a launch number, not a cruising number. It is still not on the brand table. The brakes are the other hole. “Disc” on the brand table is not hydraulic and not mechanical. Sportdeal says mechanical. The Danish card and E-BIKE 58 say hydraulic. The brake guide is why a cable disc and a hydraulic disc are different parts. No page this desk read prints a rotor diameter or a piston count.

The public film is a minute and forty-seven seconds

E-BIKE 58’s card says full suspension in the paragraph and front suspension in the list. The brand table says front suspension and does not print a travel in millimeters. A fork with no millimeter is not a number. Twenty-eight kilograms, about 62 pounds, is the brand scale line. The Danish prose says 30 kg. A factory card says 35 kg. The bike you lift is the one in the box. Sixty-two pounds with a step-through is a city bike you can get a leg through. It is still not a folder.

Who it is for

Buy it only if the button you can check out still says 36 volts, 15 amp-hours, 250 watts, 25 km/h, and a tire size you have read on that same page, and if you have looked at the wheel. The brand table says 27.5 by 1.95. A listing that says 28 inch, or 26 by 1.75, or 48 volts, or 90 newton-meters, is not that table. The US button this desk opened was out of stock at $726, from a compare-at of $1,452, and 726 times two is 1,452. A doubled compare-at is not a second measured price. Skip it if you needed a US shop with stock, a UL line, a piston count, or a gear count on the brand table. Skip it if you wanted the ESTRAPZ CS20. That one is a 72-volt high-power bike. This one, on the card VOMO prints, is a 250-watt city hub with a 540 watt-hour tank and a 15.5 mph cap. Skip 70 to 80 km until someone publishes the rider and the assist. And skip a 3-hour charge unless the pack in front of you is small enough for the brick. This desk did not ride it.