ESKUTE M300F Full-Suspension Fat-Tire E-Bike

52 V x 20.8 Ah is 1,081.6 Wh. Two things make that number more useful than it looks. First, it is the largest battery on any bike we track under $500. Above that price the Jasion EB5 Ultra carries 1,040 Wh at $799.99, and the HQYEX 20" Fat 960 Wh at $599.97. Second, the higher voltage means the same power is delivered at lower current, which keeps the controller cooler and reduces the voltage sag you feel at the end of a long climb on a 48 V pack.

With a 75 lb fat-tire bike drawing roughly 20-30 Wh per mile:

• 1,082 Wh / 30 Wh per mile = 36 miles (throttle-heavy, faster riding)
• 1,082 Wh / 25 Wh per mile = 43 miles (our planning figure)
• 1,082 Wh / 20 Wh per mile = 54 miles (moderate assist on flat ground)
• 1,082 Wh / 80 miles = 13.5 Wh per mile, which is what the "up to 80 miles" claim requires

Thirteen and a half watt-hours per mile is optimistic for a 75 lb bike on 4-inch tires, but it is closer to reality than most claims at this price. Plan on 40-45 miles, and expect the pack to take most of a night to charge: ESKUTE quotes 5-8 hours.

Against ESKUTE's M200 hardtail, the M300F swaps 27.5-inch wheels for 20 x 4.0 fat tires and adds a rear shock to the suspension fork, which is visible in the listing photos. Four-inch tires already absorb a lot of small-bump chatter; the rear shock is what takes the edge off roots, kerbs and washboard gravel. ESKUTE does not publish travel or damping figures, so read it as comfort suspension rather than trail-grade.

The rest of the sheet is sensible: a seven-speed drivetrain, an LCD, a headlight and rear reflector, an adjustable seat ESKUTE says fits teens to adults, and 90% pre-assembly with a 12-month warranty. The brakes are not named as hydraulic, so assume mechanical discs; on a 75 lb bike capable of 30-plus mph, that is the component to upgrade first.

The US three-class framework sets the rules. Class 1 and Class 2 cap motor assistance at 20 mph; Class 3 allows 28 mph on pedal assist, usually without a throttle above 20. The federal low-speed electric bicycle definition in 15 U.S.C. §2085 is written around a 750 W rated motor.

ESKUTE's table lists 33 mph and, in the same table, Class 3. A bike that reaches 33 mph is outside Class 3 by definition, and the Amazon bullet hedges with "20+ MPH" while the Amazon title says "33MPH". With no rated wattage published either, there is no reading of the paperwork under which the M300F is a class-legal e-bike as delivered. If the display exposes a speed limit, set it to 28 mph on pedal assist only (or 20 mph if you use the throttle), and check your state's rules first: seven jurisdictions ban Class 3 outright — DC, Kentucky, Massachusetts, Montana, North Carolina, Pennsylvania and South Carolina.

The Amazon listing calls the battery "certified" but does not name a standard, and neither UL 2849 (the complete e-bike electrical system) nor UL 2271 (the battery pack) appears with a laboratory or certificate number. On a pack of more than 1 kWh, that matters. New York City's Local Law 39 of 2023 bans the sale of e-bikes and batteries not certified to either standard in the city, California's SB 1271 requires certification for sales from 1 January 2026, and many buildings ask for the certificate before allowing indoor charging. Ask ESKUTE for the document before you rely on it; the sibling ESKUTE M200 at least names TUV for its battery.

ESKUTE now has four bikes on our site, and they split cleanly. The M300F is the full-suspension mountain bike with the biggest battery. The ESKUTE V300 at $399.99 puts nearly as much battery (998 Wh) into a moped-style bench-seat frame and adds a hydraulic rear brake. The ESKUTE M200 at $399.99 is the 27.5-inch hardtail for people who want big wheels and 21 gears more than fat tires. The ESKUTE V100 at $349.99 is the 16-inch mini. If you want a conventional mountain-bike riding position with the most range, buy the M300F.

Buy this if you want more than 1 kWh of battery and suspension at both ends for well under $500, you ride trails, gravel and quiet roads, and a published 360 lb payload matters to you. Skip it if you need a bike that is legal in a bike lane without adjustment, documented UL certification, or hydraulic brakes.