Macfox X1S Commuter Electric Bike

The 30-second verdict

The Macfox X1S is a $1,399 Class 2 moped-style commuter: a 500W rear hub peaking at 750W, a 500 Wh battery (48V x 10.4Ah), a 20 mph top speed, 20 x 4.0 inch fat tyres, a thumb throttle, single-speed drivetrain, front suspension, a high-strength carbon steel frame and a 65 lb kerb weight with a 220 lb rider limit. It is UL 2849 certified and Macfox recommends it for riders 5 feet 3 inches and up. A dual-battery version is $1,698. Put next to the M16, the specification is almost a copy-paste — the same motor, the same pack, the same ceiling, the same gearbox (which is to say none) — and the honest way to describe the X1S is not "the better bike" but "the adult one". What genuinely changes is wheel size, from 16 inches to 20, and brakes: the X1S gets hydraulic discs where the M16 gets mechanical. On a bike this heavy that is worth more than any number on the marketing page, and it is the reason to spend the extra $300 if you are choosing between them. What has not changed is the drivetrain: one gear, so every hill is the motor's problem alone.

Hydraulic brakes, and why they are the story here

Macfox lists hydraulic disc brakes on the X1S and mechanical (cable-actuated) discs on the M16. Those two words are the most consequential difference between the bikes.

A hydraulic system multiplies your hand force through fluid instead of a cable. In practice you get more stopping power for less effort at the lever, far less fade when you brake repeatedly down a hill, and much better consistency in the wet. Cables stretch, collect grit and need adjusting; sealed hydraulic lines mostly do not.

On a bike weighing 65 lb before the rider — and capable of holding 20 mph on throttle alone without you turning a pedal — that is not a refinement, it is the difference between confident stopping and planning ahead. If you take one thing from this review: the brake line on the spec sheet is worth more than the motor line.

Range: the arithmetic does not quite hold

The battery is 48V x 10.4Ah, which Macfox states as 500 Wh on this model (the same pack reads 499 Wh on the M16 spec sheet — the same cells, rounded differently). Macfox advertises up to 28 miles on a single charge and 56 on the dual-battery build.

Run the division: 500 Wh ÷ 28 miles = 17.9 Wh per mile.

That is optimistic. A 65 lb fat-tyred bike at 20 mph typically draws 20 to 30 Wh per mile depending on rider weight, tyre pressure, terrain and how much of the work the throttle is doing. At the efficient end you would need near-perfect conditions and a light rider doing real pedalling.

The honest band is 17 to 25 miles: 500 ÷ 30 ≈ 17 miles on throttle alone with a heavier rider, 500 ÷ 20 = 25 miles pedalling on the flat. Plan around 20 miles, and treat 28 as a best case rather than a commute you can rely on. Worth noting the M16 claims 25 miles from the same pack, which works out at 20.0 Wh/mi — so Macfox is being slightly more generous with the X1S than with its own smaller bike, even though the X1S is heavier and has more frontal area.

The dual-battery option at $1,698 adds roughly 500 Wh for $299. That is $0.60 per watt-hour, which is reasonable for a proprietary pack, and it converts a 20-mile bike into a 40-mile one. If your round trip is over 15 miles, buy it up front — retrofitting later means paying full price for a second battery.

Fit: this is an adult bike, and the seat height says so

Macfox recommends the X1S for riders 5'3" and up and lists a 33-inch seat height. Run the same check we run on every bike: inseam is roughly 45% of standing height, so a 5'3" (63 inch) rider has about a 28-inch inseam — five inches below the saddle.

That means a rider at the stated minimum height cannot put a foot flat on the ground while seated. On a moped-style frame that is more normal than it sounds, because the long bench saddle lets you slide forward and down at a stop rather than staying perched. But it is worth knowing before it arrives, and if you are near the bottom of the height range you should plan to dismount by sliding forward, not by reaching down.

For context, the M16 sits at a 28.7-inch seat height for riders from 3'11". The X1S is a genuinely different size of bike, not a colour variant.

Single speed, 65 lb, and what that combination means

There are no gears. The X1S is single speed, so the motor does all the hill climbing with no mechanical advantage to fall back on. With 500W rated and 750W peak that is fine on rolling terrain and adequate on moderate climbs, but on a long steep hill the motor is working hard and unaided, and speed will bleed away.

It also means that if the battery runs flat you are pedalling a 65 lb single-speed bike home. That is the real argument for the dual-battery version, and it is a better argument than the range number.

The 20 x 4.0 inch tyres and front suspension fork make broken pavement and kerbs a non-event, which is the point of this shape of bike. It is not a bike you carry — at 65 lb and 71 inches long, an adult moves it, and stairs are out of the question.

🔴 Legality: uncomplicated, and that is the selling point

The X1S is Class 2 — a 500W motor, comfortably under the 750W federal ceiling in 16 CFR § 1512.2, with a throttle and a 20 mph assisted ceiling. Class 2 is the least restricted category in every state that adopted the three-class framework: no licence, no registration, no insurance, and no default exclusion from bike paths the way Class 3 faces.

This matters more than it sounds for a bike shaped like this one. Much of the moped-style category — Sur-Ron and the 1,000W-plus machines it inspired — is not street legal, because it exceeds 750W, 20 mph or both. The X1S looks like those bikes and is legally a bicycle. If you want the moped aesthetic without the legal argument, that combination is genuinely hard to find, and it is the strongest thing about this bike after the brakes.

Two caveats that apply to the rider rather than the bike. Hawaii requires a one-time $30 e-bike registration under HRS § 249-14, and from 15 July 2026 bars under-16s from operating a Class 2 without adult supervision. Utah requires adult supervision under 14 and bars under-8s from any e-bike. Helmet rules vary widely and several states — Connecticut, Rhode Island, Maine, West Virginia, New Mexico — apply theirs to every class, not just Class 3. Full detail: e-bike age limits by state and your state.

UL 2849, and the charging question

Macfox states the X1S is UL 2849 certified — the standard covering the complete electrical system rather than the cells alone. That is worth real money at this price point.

New York City has required UL 2849 certification for any e-bike sold, leased or rented in the city since Local Law 39 of 2023, effective 16 September 2023 (NYC rules). Colorado's HB 25-1197, signed 28 May 2025 and effective 6 August 2025, requires UL 2849, UL 2271 or EN 15194, with labelling provisions from 1 January 2027 and penalties up to $20,000 per violation for mislabelling. An increasing number of apartment buildings and workplaces will not permit an uncertified battery to charge indoors at all.

For a 65 lb bike that will not be carried upstairs, the battery is removable and charges separately in 5-6 hours — which is the right arrangement, and the certification is what makes it acceptable to do indoors.

The service question, and Macfox's own honesty about it

The most-read thing on the internet about this brand is a Reddit thread titled "Do NOT buy an ebike from Macfox!", which ranks second for macfox review. Ignoring it would be no use to you.

The complaints cluster on after-sales support and parts availability, not on bikes failing dangerously. Macfox is a 2021 direct-to-consumer brand with no traditional dealer network, and the failure people describe is slow or unhelpful response when something needs replacing. Set against that: a 2-year warranty, UL 2849 certification, and a company that lists "Low brand recognition may hurt resale value and demand" as a stated weakness on its own product page — an unusual piece of candour.

The practical read: the hardware is better than the brand's reputation, and the support is the risk you are taking. On a $1,399 purchase shipped only within the continental United States, with 3-5 business days of processing, decide whether you are comfortable with an email-only support channel before you order.

X1S or M16?

Buy the X1S if the rider is an adult, if you will ride in traffic or on hills where the hydraulic brakes earn their keep, or if you want the 20-inch wheels for a smoother ride. Buy the M16 if the rider is a teenager, if a 28.7-inch seat height suits them better than 33, or if $300 matters more than the brake upgrade. They are the same bike underneath; the differences are size and stopping.