The Koolux X9 is a mountain bike e-bike that stands out for its price. At 1014 USD, it is 35% below the median for its type. That makes it one of the more affordable options among 190 comparable bikes.
But the low price comes with trade-offs. The X9 is heavy at 41.5 kg, which is 21% above the class median. It also has a hub motor with no published torque figure. This bike suits riders who want a basic, low-cost e-MTB and don't mind the extra weight.
What the numbers say
| Spec | This bike | Median for its type |
|---|---|---|
| Battery | 749 Wh | 840 Wh |
| Weight | 41.5 kg | 34.2 kg |
| Torque | Not listed | 80 Nm |
| Estimated range | 42 km | 49 km |
| Price | 1014 USD | 1554 USD |
Questions people ask about the Koolux X9
How much does it weigh?
The X9 weighs 41.5 kg. That is 21% above the median for its type. It is a heavy e-bike, so plan for difficult lifting or carrying.
How much torque does it have?
Koolux does not publish a torque figure for the X9. The motor is a hub type. For comparison, the median torque for this bike type is 80 Nm, but we cannot confirm the X9's value.
What speed class is it?
The X9 is a standard pedelec class e-bike. It has a top speed of 25 km/h. It has no throttle, so assistance only comes when you pedal.
How far does it really go?
Koolux claims a range of 60 km. MathBikes estimates the range at 42 km, with a band of 37 to 47 km. That estimate is 30% below the claim. The estimate comes from the range calculator, which uses a standard reference ride, not a test.
What does it cost to run?
The purchase price is 1014 USD. Running costs depend on electricity and maintenance. You can compare long-term costs with the cost calculator. The warranty is not listed, so factor that into your decision.
Where it falls short
The X9's main weakness is its weight. At 41.5 kg, it is 7.3 kg heavier than the class median. That extra weight affects handling and makes it harder to maneuver off-road. The battery is also smaller than average, at 749 Wh versus 840 Wh median.
Who should buy it
The Koolux X9 fits riders who want an affordable e-MTB and can handle the weight. It is not for anyone who needs to lift the bike often or ride long distances. Consider your own needs before buying.
- You want a low-cost entry into e-MTBs and don't mind a heavy bike.
- You ride mostly flat terrain and short distances, under 42 km per charge.
- You are comfortable with a hub motor and don't need high torque for steep climbs.
Look elsewhere if you need a lighter bike for carrying or technical trails. Also consider other options if you want a longer range or a published torque figure. The X9 makes clear compromises to hit its price.
