YUCHETX Moped 20

This is the first question, and the listing does not answer it cleanly. The title says 18.9 Ah, one bullet says 48 V 20.8 Ah, the Included Components field says 15.6 Ah, the only variant on the listing is named "1500W 15Ah", and the spec table says 709 watt-hours. At 48 V those work out to 907 Wh, 998 Wh, 749 Wh, 720 Wh and 709 Wh.

We plan around the variant name, roughly 720 Wh, because that is the option you select at checkout. It is still a large pack for $299 (as of Sep 16, 12:01 PM EDT, subject to change). If a bigger pack turns up, that is a bonus, not something to count on.

One bullet promises up to 70 miles in pure electric mode; the title says 60. Pure electric means throttle only, on an 88 lb bike with 4-inch tires. On 720 Wh, 70 miles is 720 / 70 = 10.3 Wh per mile. Even on the most generous 998 Wh reading it is 998 / 70 = 14.3 Wh per mile. Heavy fat-tire bikes ridden on the throttle at 20 mph and above typically use 25-30 Wh per mile, which gives 720 / 30 = 24 to 720 / 25 = 29 miles. Plan on about 25 miles of throttle riding, more if you pedal in assist mode at lower speed.

The US three-class system caps Class 1 and Class 2 at 20 mph. Class 3 allows 28 mph but is pedal-assist only in most states, so no throttle. The federal consumer-product definition of a low-speed electric bicycle (15 U.S.C. §2085) is written around 750 W rated and 20 mph on motor power alone. This bike advertises 30-35 mph with a pure electric mode, which means riding on the throttle without pedalling, and states only a 1600 W peak figure, so it fails on speed and gives you no rated wattage to point at. In most states that makes it a moped or motor vehicle on public roads, which can bring registration, insurance and licensing rules with it. Check yours on our street-legal-by-state guide.

If the display menu offers a speed limit, setting it to 20 mph is the step that moves it towards Class 2 behaviour. It still would not give you a rated wattage on paper.

Neither UL 2849 (the complete e-bike electrical system) nor UL 2271 (the battery) is documented for this listing. That matters more than usual here: this is a large lithium pack from a brand whose own website, yuchetx-bikes.com, does not list this model. If you charge indoors or in a building with a battery policy, treat it as uncertified.

Brakes are the weak point. The listing specifies cable-actuated dual disc brakes. That is normal on a 20 mph commuter. On an 88 lb bike the seller says will do 35 mph, with a rider on top, cable discs have a lot of work to do, and hydraulic brakes would be our first upgrade. Check pad wear often.

Suspension is genuine at both ends: a front fork and a rear coil shock, which is better than the "dual suspension" on many moped-style listings that turns out to be a sprung seatpost. Gearing is a 7-speed setup the listing spells "Shamano", so do not assume a genuine Shimano derailleur until you see the part. There are three modes (pure electric, electric assist, pedal only), an LCD display, a headlight and tail light, a 6-8 hour charge, and 90% pre-assembly. The "59 x 13.4 x 33 inch storage box" in the listing reads like the shipping carton dimensions; the cargo space on the bike is the wire cage in the frame. The warranty is 12 months on the battery, charger and accessories.

The ASKGO S9 at $499.99 (as of Sep 16, 12:01 PM EDT, subject to change) is the closest match: also 20 x 4, also moped-styled, also too fast for any class, but with a clearly stated 960 Wh pack. The DTTZH F6 at $469.98 (as of Sep 16, 12:01 PM EDT, subject to change) is the choice if paperwork matters, since it states a 750 W rated motor, though it gives no top speed. For other retro moped frames, see the DEEPOWER QS7 and the Jasion RetroVolt 330.