Verdict: DUOTTS S26
Our editorial rating is based on product testing.
- the pair of 750 W motors takes care of solid performance
- top speed of 55 km/h after unlocking
- battery with branded Samsung cells
- good hydraulic disc brakes with large, bold calipers
- a clear display with simple graphics and good readability
- high weight up to 42 kg
- long charging time (8 - 10 hours)
- not very suitable for tougher terrain, since the suspension isn’t good enough
From DUOTTS we’ve already tested a strong electric e-scooter D88 or even a mountain bike with the C29 model designation. For the third time, we have another bike here, but from a different category. This is an off-road fat bike with dual motors, DUOTTS S26.
In the review, as usual, we’ll first look at the build quality and what’s in the box, but we won’t skip our favorite range test on a single charge. With this model, we’re especially curious how it performs, since on paper it excels in several areas.
Where to buy DUOTTS S26?
The DUOTTS S26 electric bike with dual 750 W motor, dual suspension, and a 921 Wh battery from Samsung is available from the Banggood seller with a discount code for a lower price, along with fast and free shipping from the CZ warehouse.
DUOTTS S26, Banggood
CZ warehouse
TIPExpress delivery from the Czech warehouse with no customs duties and VAT.
This product will be delivered to you express from the local Czech warehouse. Delivery from Czechia usually takes 7-10 days and is handled by courier. On delivery, you don’t pay any additional fees—no customs duty and no VAT.
Technical specifications
| Model | DUOTTS S26 |
|---|---|
| Dimensions | 190 x 113 x 71 cm |
| Weight | 42 kg |
| Load capacity | 200 kg |
| Material | aluminum alloy |
| Water resistance | IPX4 |
| Power | 2 x 750 W |
| Torque | 130 Nm |
| Maximum speed | 50 – 55 km/h |
| Battery | 48 V / 20 Ah Samsung |
| Range on a single charge | 40 – 60 km in pure electric mode / 100 – 120 km in assisted mode |
| Charger | 48 V / 2 A |
| Charging time | 8 – 10 hours |
| Suspension | front and rear |
| Wheels | 26 x 4" |
| Speeds | 7 with a Shimano derailleur |
| Brakes | hydraulic disc brake |
| Display | LCD |
Packaging contents & quality
The electric fat bike DUOTTS S26 was delivered by the SPS courier in a box measuring 148 x 29 x 77 cm, with a total weight of almost up to 50 kg. However, the box also includes a pair of grab handles for lifting, so two people can carry it without any problem.
Inside, the bike is packaged in a partially disassembled state—without the handlebars, the front wheel, and other components, of which there are quite a lot. Everything is well protected with various foam protective inserts and secured with zip ties so nothing gets damaged during transport. In this case, the battery is also wrapped separately and isn’t placed in the frame.
But removing the packaging materials takes quite a bit of time. In addition to the basic components, you’ll also find two gifts in the box. They’re a smaller hand pump and a smartphone holder.
Set aside more time for assembly
After successfully unpacking all the components and removing the protective braces, we got started assembling the bike. It’s manageable even for a single person, but count on longer setup time since there are quite a lot of parts you need to secure.
We started the usual way—with the stem and attaching the handlebars. But in this case, the stem is oriented toward the inside of the frame, so first we had to loosen the pair of side screws in order to straighten it out.
Then we opened the stem by unscrewing four screws, where we inserted the handlebars. That’s when we noticed that we were missing one small screw that holds the display on the handlebars. Unfortunately, we couldn’t find it anywhere in the box.
The second step led to installing the seat. It has an exceptionally long seat post, so it will fit even taller riders. Next, we attached the front wheel, which this time also includes the motor—so besides tightening the nuts, you also need to connect the cable and secure it so it won’t get in the way while riding. The manufacturer includes a few zip ties.
Next, we installed the pedals and the front light. Then we continued with the rear rack, which isn’t a mandatory feature, but it does come with a rear light that we would otherwise miss. Don’t forget to connect and secure the cable to the light here as well.
In the box you’ll also find fenders, but we skipped installing them since we weren’t planning to ride in wet terrain. After that, we secured the orange reflectors into the wheel spokes and inserted the battery into the frame.
Design and build quality
In terms of design, the DUOTTS S26 looks quite good. The frame combines black and red—something that never goes wrong. Right away, though, the bike looks somehow packed and bulky, which isn’t helped by the battery either: it’s big and not at all recessed into the frame.
The overall weight—up to 42 kg—also won’t please anyone, putting the bike among the heaviest we’ve ever tested. The weight is increased by the second motor and the large battery.
Unlike the mountain bike DUOTTS C29, which we criticized for its unattractive plastic control box at the bottom of the frame, the new DUOTTS S26 doesn’t have that. The controller is stored in a cover around the bike’s bottom bracket area, which at first glance gives the impression that there’s a motor there.
The frame is otherwise made from an aluminum alloy, and its quality is standard. Still, we’d like some components to be better quality, but we’ll talk about those in the following chapters.
Wide handlebars and the bike’s geometry
DUOTTS S26 has a fully suspension frame with a very nice geometry that should also suit taller riders. The bike’s total length is 195 cm, and the seat can be adjusted to a height of 87 – 103 cm from the ground. Detailed dimensions of the entire frame can be found in the image below.
You’ll also appreciate the generous handlebars with a total width of 71 cm. They’re mounted roughly 110 cm above the ground.
On the left side of the handlebars, you’ll find the front brake lever for the front brake and a pair of control elements with buttons. On the first one, there’s a light controller, a motor switch, and a horn. The second controller has buttons for switching between modes “+” and “-”, along with a button to turn the power on and off.
In the middle section, there’s a large, clear LCD display where you’ll also find a foil with a QR code—since the bike even has Bluetooth and you can add it to a smartphone app. The display graphics are simple and easy to read.
On the right side of the handlebars, there’s an unattractive plastic piece with a USB-A port, allowing you to top up your smartphone while riding. Next, there’s the rear brake lever and Shimano shifting, which really spoils the overall impression of the bike. We don’t understand why the manufacturer chose this completely basic and, above all, outdated model.
The manufacturer also includes a throttle controller—so-called half-twist grip—which we mounted directly onto the handlebars right away during assembly. The original grip doesn’t come off the handlebars very easily, and we struggled a bit with it, but anyone can handle it for sure.
Motor, speed unlocking, and riding modes
The electric fat bike DUOTTS S26 stands out thanks to its pair of motors, each rated at 750 W. As we mentioned in the introduction, both motors are housed in the wheels, and the controller has found its place around the bike’s bottom bracket area.
There are 5 assist modes available, as well as a zero mode that lets you ride the bike without electric drive. Just keep in mind that riding it is really hard—especially because of the high weight.
Modes 1 to 5 are stepped based on the maximum speed, which the bike reaches immediately after you start pedaling. The maximum speed is preset to 25 km/h.
In the hidden menu, which we access by holding down the “+” and “-“ buttons, we’ll find a speed boost under the P08 selection. Here it works a bit differently than with other bikes. It’s not enough to set a higher number than 25, but we need to set exactly 67 in order to unlock the speed.
After this, the maximum speed increases to around 55 km/h, which is very decent. In mode 1, once unlocked, the bike accelerates to 22 km/h; in the second mode it’s 30 km/h, in the third 38 km/h, in the fourth it’s already 45 km/h, and in the highest one you reach the mentioned 55 km/h.
Acceleration and overall performance
What surprises us, though, is the different behavior of the motors when pedaling and when adding throttle using the twist-grip. If we twist the pedals, the motors activate automatically and provide truly very solid pull. With single-motor drive, acceleration is of course noticeably weaker.
What’s odd, though, is that when you accelerate using the twist throttle, the acceleration is much weaker—almost the same whether you use two motors or just one. To make things worse, the maximum speed is also significantly lower when using this throttle controller. In this case, the top speed is somewhere around 43 km/h, whereas when pedaling, the bike can accelerate without any issues up to 55 km/h.
Overall performance of this fat bike is very good, but on steep and long hills, of course, it slows down more noticeably due to its weight—also below 25 km/h.
An app that’s more or less pointless
As we already mentioned earlier, the bike has Bluetooth and lets you add it to the DUOTTS app on your smartphone. The app requires registration and sign-in, but adding the bike afterward is quite simple.
In the app, you can see a few basic details like the battery’s percentage level, which is however inaccurate and jumps around, the current speed, the riding mode with switching options, distance covered (odometer), time since turning on, and a couple of settings.
These include settings for speed units, cruise control, and start from zero. Other than these options, the app is pretty pointless, since even the battery percentage level isn’t shown correctly.
Battery and range on a single charge
Another big lure of the DUOTTS S26 bike is its 48 V / 20 Ah battery, which the manufacturer says should use Samsung cells. The branded battery is a big plus, but unfortunately we can’t verify whether the inside really contains those branded cells.
According to the manufacturer, in pure electric mode we should be able to achieve a range of 40 – 60 km. We mostly used the bike in the highest speed setting with dual drive turned on.
We started the ride in Košice and continued into the surrounding villages. We started out more slowly, but as soon as we got out of the city, we sped up to the maximum and kept our top speed most of the time, or as fast as the conditions allowed.
In the end, we also tried an off-road ride, so we headed from Košice's KVP housing estate up to Horný Bankov, through a meadow and a forest. Our ride ended with a longer descent, when the last battery bar also disappeared, and the Strava app measured the route length at 39.49 km. We were pedaling only in vain, and our editor weighs 75 kg.
The app still showed 20 %, but it was probably an incorrect figure since it had displayed that capacity for quite a long time. At that point we stopped tracking the ride, but even with the flashing battery symbol we still managed to cover 4.5 km before making it home. In total, we rode 43.99 km, which is a very good figure for a bike of this weight.
You can charge the battery separately or even on the bike. However, it takes 8 – 10 hours.
Suspension, wheels, and ride comfort
What would a fatbike be without big, wide tires. The DUOTTS S26 comes with tires sized 26 x 4″, inflated only to 20 PSI. They have a tread made for off-road riding and do an excellent job absorbing bumps.
Since it’s a full-suspension bike, in front you have a standard spring fork with a lock option, and at the rear you get a second shock absorber. It’s only a simple, basic model—don’t expect anything special.
Unfortunately, while riding we didn’t get the feeling that we were sitting on a fully-suspended bike. The front fork sometimes rattles and bangs, and on top of that the rear shock is too stiff. Light terrain like a nice forest or country path handles well, but when we hit a rocky road, or something bumpier, the bike really kicks us out.
Also, even the wide saddle wasn’t very comfortable for longer rides.
Disc hydraulic brakes and shifting
When the suspension let us down, at least the brakes are good. They’re hydraulic disc brakes with distinctive red aluminum calipers. As for braking performance, it’s decent—and even with this heavy e-bike, we had no problem stopping, even in emergency situations. In this case, the disc has a diameter of 180 mm.
We have 7 speeds with shifting from the popular Shimano brand. But the shifter on the handlebars is only an ultra-cheap, entry-level model—we simply don’t understand that. The manufacturer could’ve at least used Shimano Altus shifting, which costs just a few extra bucks and offers much better functionality and an overall better feel.
Since when riding fast we’re only turning the pedals idly, it would also be worth considering a second chainring, which would give us heavier gear ratios.
Lighting
Up front you’ll find a white light that’s bigger than usual. It definitely shines better than most Chinese e-bikes, but it could have a slightly wider beam. Still, you can ride comfortably with it even at night.
What pleased us more was the rear light—it’s quite wide and very easy to see. It’s a shame, though, that the manufacturer decided to mount it to the rear rack. Personally, we wouldn’t mount this rack at all if we had the option to move the light somewhere else.
DUOTTS S26: Final assessment
The electric fatbike DUOTTS S26 will definitely catch your eye right away thanks to its rugged build and a large 20 Ah battery. By the way, it should use Samsung cells, which is a big plus.
The bike features a dual 750 W motor drive. This setup ensures a maximum speed of 55 km/h and a solid range even in pure electric mode. You’ll also appreciate the clear, easy-to-see display and quality hydraulic brakes.
The downside of this kind of spec is the high weight—up to 42 kg. There are also parts where corners were cut, especially the cheap Shimano shifting and a less-than-quality suspension.
DUOTTS S26
EU warehouse
TIPExpress delivery from a European warehouse without customs duty and VAT.
This product will be delivered to you express from a local warehouse in Europe. Delivery from EU warehouses usually takes 2–10 days and is handled by a courier. When delivered, you don’t pay any extra fees—no customs duty or VAT.
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