Vivi M026SHUL 500W Hardtail Mountain E-Bike

The 500W rated rear hub (Vivi markets the 1000W peak figure; the rated number is what state statute power caps regulate) delivers 65 Nm, adequate for rolling terrain and short climbs at this weight. Assist is a cadence sensor: it reads whether the cranks turn, not how hard, so power arrives in on/off steps. According to Vivi's spec table, pedal assist tops out at 21.7 mph with the half-twist throttle capped at 15.5 mph, an unusual pairing that keeps the throttle well inside every state's 20 mph throttle limit while the assist ceiling technically makes this a Class 3 bike under the three-class model most states have adopted (anything over 20 mph assist is Class 3 territory, up to the 28 mph cap). The Amazon listing we link states 19.8 mph instead, which would sit under the 20 mph Class 1 and Class 2 line. Check the cap on the display when it arrives, then check your state's rules on Class 3 path access before assuming trail access.

Vivi claims "50-mile long-range off-road capability." The arithmetic disagrees: 374 Wh ÷ 20 Wh/mi (a typical 26" hardtail burn rate) ≈ 19 miles of mixed pedal assist, and hillier off-road riding burns closer to 25-30 Wh/mi, which lands in the low teens. Fifty miles would require ~7.5 Wh/mi: eco-assist on a flat rail trail with a tailwind. Plan around 15-22 miles and charge nightly. The battery is removable, so a second pack is the range fix if you outgrow it, but at that point the F26FUL and its 864 Wh upgrade path is the smarter single purchase.

The frame is a conventional 26" high-step hardtail: 41.7" wheelbase, standard MTB geometry, no fold. The fork is a basic coil unit; brakes are cable-actuated discs; the drivetrain is entry-level Shimano. None of that is a complaint at the price, since it is the same component tier every sub-$500 e-bike ships, but the 180 mm hydraulic setup on the ACE01 exists for a reason at 25 mph speeds, and 21.7 mph is close enough that brake maintenance matters here too. Per the SGS test record Vivi published on its own product page (read July 2026), the electrical system carried certification to UL 2849, the standard cited by NYC Local Law 39 and California SB 1271. The Amazon listing we link makes no UL claim, so if certification is the reason you are buying, ask the seller for the certificate covering the listing you order before you pay.

Buy the M026SHUL if you want a full-size e-MTB shape for short commutes and weekend gravel on a tight budget. Skip it if you ride more than ~15 miles at a stretch (battery), descend fast (brakes), need UL 2849 confirmed on the listing itself, or want the fold, because the M026TGBUL adds folding (and, per Vivi's product page, a rear shock) for $519.99 (as of Oct 14, 5:10 PM EDT, subject to change) against this bike's $405.44 (as of Oct 14, 5:10 PM EDT, subject to change), and remains our pick between the two siblings.