The Duotts C09 is a city e-bike with a 720 Wh battery, which is 15% above the median for its type. That extra capacity is its clearest advantage. It also has 70 Nm of torque, 27% above the median. The bike weighs 26.7 kg, 1% below the median.
This bike suits riders who want more range and power than a typical city e-bike offers. The 720 Wh battery and 70 Nm motor give it an edge on paper. It is not a cargo bike and not foldable. If you need to carry heavy loads or store it in a small space, look elsewhere.
What the numbers say
| Spec | This bike | Median for its type |
|---|---|---|
| Battery | 720 Wh | 624 Wh |
| Weight | 26.7 kg | 27 kg |
| Torque | 70 Nm | 55 Nm |
| Estimated range | 52 km | 45 km |
| Price | 1187 USD | 1299 USD |
Questions people ask about the Duotts C09
How much does it weigh?
The Duotts C09 weighs 26.7 kg. That is 1% below the median for its type, which is 27 kg. So it is about as heavy as a typical city e-bike, not lighter. At this weight you will notice it when lifting or carrying it.
How much torque does it have?
It has 70 Nm of torque. That is 27% above the median for its type, which is 55 Nm. More torque means stronger assistance, especially on hills or when starting from a stop. The rated motor power is 250 W, but peak power is not published.
What speed class is it?
The top speed is 25 km/h. The speed class is not listed. That means you cannot tell from the specifications whether it is limited to a particular class. Check with the seller if speed class matters for where you ride.
How far does it really go?
The manufacturer claims 90 km. The MathBikes estimate is 52 km, with a band of 46 to 58 km. That estimate is 42% below the claim. The estimate uses one reference ride: Tour assist, rolling terrain, mild weather, brisk pace, and an 80 kg rider. It is not a measurement. Use the range calculator to see how your own conditions might change it.
What does it cost to run?
The price is 1187 USD, which is 9% below the median for its type. The battery is 720 Wh, or 48 V and 15 Ah. Running costs depend on your electricity price and how often you charge. The warranty is not published, so you cannot factor that in. Try the cost calculator to work out your own running costs.
Where it falls short
The biggest shortfall is the gap between the claimed range and the estimate. The claim is 90 km, but the estimate is 52 km, 42% lower. That means you should plan on fewer kilometres than the marketing suggests. Also, the bike is not cargo capable and not foldable, so it is less versatile than some city bikes. The warranty is not listed, which adds uncertainty.
Who should buy it
Buy the Duotts C09 if you want above-average battery capacity and torque for a price below the median. It suits riders who value power and are willing to accept a realistic range that is lower than the claim. It is a city bike, so it works best for commuting and errands on paved roads.
- You ride in a hilly city and want strong assistance from the 70 Nm motor.
- You want a battery larger than the class median without paying above the median price.
- You need a bike that can carry up to 150 kg, including rider and gear.
Look elsewhere if you need a folding bike, a step-through frame, or a bike with a published warranty. Also consider another model if the claimed range of 90 km was a key reason for your interest, since the estimate is much lower. And if you need to carry cargo, this bike is not rated for it.
