The Koolux RK10 is a folding e-bike that stands out for its weight. At 34.7 kg, it is 21% heavier than the median folding bike, which weighs 28.6 kg. That heft is a trade-off for a 624 Wh battery, which is only 7% below the class median of 672 Wh. This bike suits riders who prioritize battery capacity over portability.
The RK10 is a standard pedelec with a top speed of 25 km/h. It has a hub motor, but the torque is not listed. The manufacturer claims a range of 70 km, but our estimate is 45 km. That estimate is 36% below the claim, so treat the official number with caution.
What the numbers say
| Spec | This bike | Median for its type |
|---|---|---|
| Battery | 624 Wh | 672 Wh |
| Weight | 34.7 kg | 28.6 kg |
| Torque | Not listed | 50 Nm |
| Estimated range | 45 km | 48 km |
| Price | 1068 USD | 1068 USD |
Answers to common questions
How much does the Koolux RK10 weigh?
The RK10 weighs 34.7 kg. That is 21% above the median for folding bikes, which is 28.6 kg. If you need to carry it up stairs or onto a train, this weight is a real drawback.
How much torque does the motor have?
Koolux does not publish the torque for the RK10. The median torque for folding bikes is 50 Nm, but you cannot compare this bike to that figure. Without a published number, you cannot judge its hill-climbing ability from specs alone.
What speed class is it?
The RK10 is a standard pedelec, so it assists up to 25 km/h. It has no throttle. This means it behaves like a conventional bicycle with extra help, not like a moped.
How far does it really go?
Koolux claims a range of 70 km. MathBikes estimates 45 km, with a band from 39 to 50 km. That estimate is 36% below the claim. The estimate comes from a formula, not a test, and you can adjust it with the range calculator.
What does it cost to run?
The price is 1068 USD, which is exactly the median for folding bikes. Running costs depend on electricity, maintenance, and replacement parts. Use the cost calculator to estimate your own costs. The warranty is not listed, so factor that into your decision.
Where it falls short
The RK10's main weakness is its weight. At 34.7 kg, it is 21% heavier than the median folding bike. That extra weight makes it harder to carry, lift, or maneuver when not riding. It also has no throttle and no step-through frame, which limits its appeal for some riders.
Who should buy it
The RK10 fits riders who want a folding bike with a large battery and do not mind the weight. It also suits those who plan to ride mostly on flat terrain, since the torque is not published and the motor may not be powerful. If you need to carry the bike often, look elsewhere.
- You want a folding bike with a 624 Wh battery for longer rides.
- You ride on flat routes and do not need high torque.
- You have a place to store the bike where weight is not an issue.
If you need a lightweight folder for commuting with stairs or public transport, the RK10 is not for you. Its 34.7 kg weight is a burden. Also, if you expect the claimed 70 km range, you will be disappointed by the 45 km estimate.
