01 / 01▶
DUOTTS
C29K
Generous energy capacity, a powerful motor and good brakes after bedding in. Dated design, abrupt assistance and an obstructive rear battery limit comfort.
An experienced C29 rider needing more energy for long regular trips and accepting ergonomic compromises.
Duotts C29K: more energy, the same basic platform
The C29K builds on the popular C29 with a second battery and hydraulic brakes. These are useful improvements, not a complete redesign. The basic frame looks dated, the components remain entry level, and the powerful motor encourages brisk riding. It suits someone who knowingly prioritises energy capacity and acceleration over refinement.
How the two batteries work
The removable packs are rated at 48 V 15 Ah and 48 V 22.5 Ah. Their combined nominal energy is 1800 Wh, calculated from voltage and capacity. Only one pack supplies the motor at a time. Select it manually with the switch beneath the rear rack, preferably after stopping. There is no automatic changeover or simultaneous discharge. The tested package included two chargers; the separate locks use different keys.
Range: estimate, not a measured discharge test
The reviewer estimates around 130-140 km of gentle riding using both packs. This is not a completed full-discharge test or a guaranteed distance. Less frequent charging on regular trips is the clearest benefit. Speed, climbing and load affect consumption, so keep a reserve when planning routes.
Strong assistance, limited finesse
The cadence sensor engages quickly, but the tested bike accelerated abruptly. With the limiter removed, assistance levels behaved more like speed targets than subtle support settings. The reviewer reached approximately 55 km/h on non-public land. This describes one unlocked test bike, not every version or a recommendation for public-road use. The manufacturer distinguishes 250 W EU and 750 W International versions; check the actual configuration before buying.
Improved brakes, basic running gear
After adjustment and bedding in, the hydraulic brakes worked well and outperformed those on the mechanical-brake C29 previously tested. Initial braking was weak, so proper preparation matters. No stopping-distance measurement was provided. Shimano Tourney components and the basic front fork do not make this a refined technical-trail bike.
Battery capacity cannot fix riding position
The rear pack restricts saddle lowering and fore-aft adjustment. Its metal housing also obstructs swinging a leg over the bike; the reviewer hit it several times and once cut his leg. The stretched position loaded his hands and back on longer rides. Try the bike with both packs installed, particularly if you need a low saddle or easy mounting. The reviewer’s comment about roughly 185 cm is a personal fit impression, not a universal height limit.
Details that need work
The display had poor viewing angles and occasionally dimmed or interrupted operation when its angle was adjusted on the test sample. Plastic mudguards rubbed against the tyres over bumps and needed repeated adjustment. The non-indexed front shifter requires careful positioning to avoid chain rub. These practical shortcomings remain despite the extra battery.
Who should consider it?
An experienced C29 rider who likes its character but needs more energy for long regular trips is the strongest match. Expect some adjustment work and less natural assistance. Delivery riders may appreciate the capacity, but frequent mounting and a delivery box can make the rear battery obstruction more troublesome. For relaxed leisure rides, a first e-bike or easy access, a different design makes more sense.
Verdict
The published review score is 6.1/10. This is a longer-working C29 with a worthwhile brake upgrade, not a thoroughly modernised model. The upgrade makes most sense when you will genuinely use the second battery. Capacity alone does not compensate for the limitations if comfort, smooth assistance and refined equipment matter more.
Questions and answers
Do both batteries power the motor together?
No. Select one pack manually; the bike uses one power source at a time.
Was 130-140 km measured?
No. It is the reviewer’s gentle-riding estimate, not a full discharge test of both packs.
Does it have a torque sensor?
No. The tested bike uses a cadence sensor with abrupt assistance.
What changes compared with the C29?
An additional 22.5 Ah battery and hydraulic brakes. The geometry and many basic components remain similar.
Is it suitable for a shorter rider?
A fitting session is essential. The rear battery restricts saddle lowering and obstructs mounting.
What does the JOTEM code save?
The review provides the code but contains conflicting discount amounts. Check the actual saving at checkout.
Duotts
C29K
Watch without leaving the page or open the original video review.
Key strengths
01Two removable batteries with generous combined capacity
02Two chargers in the tested package
03Good hydraulic brakes after adjustment and bedding in
04Powerful motor, including on climbs
Key drawbacks
01Rear battery restricts saddle adjustment and mounting
02Abrupt cadence-sensor assistance
03Stretched position loads hands and back on long rides
04Display issues and rubbing mudguards on the test bike
05Basic components, manual battery selection and separate keys
Duotts C29K specifications
with test commentary.
Each parameter is explained from a real riding perspective, including its effect on range, comfort, safety and everyday electric bike use.
1800 Wh nominal combined energy, calculated.
No automatic changeover.
No full discharge test of both packs.
Manufacturer versions; not interchangeable.
Not measured in the review.
Abrupt assistance on the test bike.
Good after adjustment and bedding in.
Non-indexed front shifter.
No rear suspension.
No specifications borrowed from another C29 variant.
Check the current e-bike price at active stores.
Prices, promotions and stock change frequently. Each button links directly to the selected store or manufacturer.
Similar bikes
You may also be interested in
L28 Max
A strong choice for long, relaxed rides and everyday utility if you accept its 31 kg weight, audible motor and delayed cadence sensor.
Read the full review ↗
E26
The best Duotts for power delivery, braking and high-speed stability, although the less expensive E29 is more agile and more comfortable over rough ground.
Read the full review ↗
MG600 Lite
An excellent base for long rides and everyday commuting, but my test bike had several assembly issues and a potentially dangerous problem involving the optional throttle.
Read the full review ↗