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A hands-on DUOTTS C29-K review for Slovenian riders: dual 37.5 Ah battery, up to 170 km claimed range, 65 Nm torque, Shimano 21-speed and EU-legal 250 W / 25 km/h.
Long distances are the new battleground in the European e-bike market, and Slovenia is a tougher testing ground than most. A rider commuting into Ljubljana from the surrounding valleys, climbing out of a river basin in the afternoon and still heading out again at the weekend needs range, torque and brakes they can trust. The DUOTTS C29-K is built for exactly that brief: a full-size 29-inch e-bike with a dual-battery system rated at up to 170 km, a 65 Nm motor and hydraulic disc brakes as standard. In this DUOTTS C29-K review we look at the specifications, the ride, and how the bike actually fits Slovenian roads and rules. Full data is taken from the DUOTTS official product page.
Long distances are the new battleground in the European e-bike market. Commuters want to ride for days without thinking about charging, delivery riders need bikes that can work a full shift, and leisure riders want to explore beyond the city limits. The DUOTTS C29-K is built squarely for that demand. It combines a dual-battery system with a total capacity of 37.5 Ah, a 65 Nm motor, hydraulic disc brakes as standard, a Shimano 21-speed drivetrain and large 29-inch wheels — with the official specification rating range at up to 170 km in assist mode. In this review, we look at what the C29-K offers European riders and whether it lives up to the long-range promise.
The C29-K is a full-size, 29-inch-wheel electric bike with a chunky, confident look. The frame is aluminum alloy, keeping the weight at 32.5 kg — heavy by traditional bike standards but reasonable for a dual-battery e-bike of this size. The bike measures 1860 × 1080 × 680 mm, and the geometry suits taller riders: DUOTTS recommends it for riders from 170 cm to 200 cm, with the saddle adjustable between 95 cm and 103 cm.
The wheels are 29-inch rims shod with Chaoyang 29 × 2.125-inch tires (30 TPI, with inner tubes) — a setup that rolls smoothly over broken tarmac and tracks and climbs curbs with ease. The aluminum suspension fork offers 100 mm of travel with a lockout, so you can firm it up for tarmac or open it up for rough ground. A steel rear rack rated at 25 kg is fitted as standard, and plastic mudguards keep spray off your back in wet weather. The bike carries an IPX4 water-resistance rating and is CE certified.
The cockpit reflects the C29-K's work-oriented design. The aluminum alloy handlebar is 68 cm wide for stable, relaxed control, and the cranks and pedals are aluminum as well, with 170 mm crank arms that suit taller riders. DUOTTS publishes detailed geometry: the wheelbase is 113 cm, the seat tube 42 cm and the top tube 54 cm, with a bike height of 108 cm and a total length of 186 cm. The result is a roomy, upright riding position that keeps you comfortable over long distances and gives a clear view of traffic.
DUOTTS sells the C29-K in two versions: a 250 W motor for the EU market and a 750 W motor for international markets, both 48 V brushless units with 65 Nm of torque. The EU version is the one for European riders: 250 W continuous power keeps it street-legal as an electrically power-assisted cycle, and the 65 Nm torque provides strong, confident assistance on hills and under load. The motor uses a speed sensor with five levels of pedal assist (0–5), plus an electric half-twist throttle for on-demand power.
Top speed is 25 km/h for the EU version (45 km/h for the international version), and the maximum climbing angle is rated at 30 degrees — a figure that reflects the motor's torque capability on steep urban and rural gradients. There are three riding modes: regular cycling (motor off), pedal-assist and pure electric. That flexibility means you can treat the C29-K as a normal bike, an assisted commuter or a throttle-driven machine depending on the situation.
The C29-K's defining feature is its dual-battery system: a 48 V 15 Ah main battery plus a 48 V 22.5 Ah extended battery, giving a combined 37.5 Ah of capacity. DUOTTS' official specification lists a maximum range of up to 170 km in assist mode, with the brand's marketing materials claiming up to 200 km and pedal-assist range quoted at 150–170 km. As always, range depends on rider weight, terrain, wind and assist level — the marketing figure assumes light assist and a 75 kg rider — but even a conservative real-world estimate is exceptional: comfortably more than a week of typical commuting or a full shift of delivery work on a single charge.
The bike ships with two chargers — 54.6 V 2 A and 54.6 V 3 A — and DUOTTS quotes a charging time of 6 to 8 hours for the battery system. The dual-battery architecture also means you can stagger charging and keep riding: the 22.5 Ah extended battery works with the main battery to push rides further and reduce charging frequency. The system is rated for operation between -10 °C and 40 °C, and the IPX4 water-resistance rating covers rain and splashes — though, as with all lithium batteries, expect reduced range in cold winter weather.
The C29-K is equipped with a Shimano Tourney 3 × 7-speed derailleur system — 21 gears in total — a significant step up from the single-speed or 7-speed setups found on many budget e-bikes. The wide gear range lets you spin comfortably on flats, maintain momentum on descents, and grind up steep climbs under your own power if you ever run out of assist. A rear derailleur protector shields the mechanism against damage and chain slippage, a thoughtful touch for a bike likely to see hard daily use.
Ride quality is where the 29-inch wheels pay off. Larger wheels roll over obstacles more smoothly than smaller ones, track better at speed and are more efficient on longer rides. The suspension fork with lockout, the comfortable geometry and the 65 Nm motor make the C29-K a genuinely pleasant machine for all-day riding. Stopping power comes from hydraulic disc brakes with 160 mm rotors front and rear — fitted as standard, which is notable at this price point. Hydraulic brakes deliver consistent, precise stopping in all weather, on descents and in traffic.
For European cities with real hills — think Lisbon, Barcelona or the Alpine foothills — the combination of 65 Nm of torque, 21 gears and hydraulic brakes gives the C29-K a genuinely capable character: the motor carries you up, the gears let you find the perfect cadence, and the brakes keep everything controlled on the way down. On flat terrain, the 29-inch wheels and upright position make for an efficient, relaxed cruise at the 25 km/h assist limit.
The C29-K is a smart e-bike. The 2.4-inch HD display is Bluetooth-enabled and pairs with the DUOTTS app, which lets you record rides, track your journeys and manage your bike's features from your phone; the app keeps your ride statistics and bike data in one digital garage. The handlebar area includes a mobile phone charging port, so you can top up your phone on the go — a genuinely useful feature for delivery riders and long commutes. The control panel also includes a headlight switch, a horn button and the 5-speed multifunction display, while the 300-lux headlight provides strong illumination for night riding. Everything is routed and laid out for daily practicality rather than show.
The C29-K is a working bike. The steel rear rack is rated at 25 kg — enough for panniers or a delivery box — and the 150 kg maximum load covers the rider plus cargo. DUOTTS markets the bike heavily at delivery riders (the product photography shows it with a courier box), and the combination of huge range, 21 gears, hydraulic brakes and phone charging makes it a credible workhorse for that use case.
It is equally at home for commuters who want to go car-free for a full week without charging, and for taller riders (170–200 cm) who find smaller-wheeled e-bikes cramped. The 32.5 kg weight and large dimensions mean it is not a bike for carrying up stairs or squeezing into a tiny flat — plan for ground-floor storage or a secure shed. The box includes the chargers, user manual, a 16-in-1 tool, pedals, a half-twist throttle, a quick-release axle, motor axle protectors, an air pump and a phone bag, so there are no surprise accessory purchases needed to get riding.
For European buyers, the EU version of the C29-K (250 W, 25 km/h) is the one to order; it is CE certified and rides within the electrically power-assisted cycle rules that apply in most EU countries. DUOTTS sells it at €1,199 (regular price €1,279) on its official site, and a coupon code DUOTTS-C29K takes a further €30 off at checkout. Shipping is free from DUOTTS' warehouse in Poland, with dispatch typically within 1–2 business days and delivery in 3–7 business days depending on your location; all taxes and fees are covered by DUOTTS.
The 2-year warranty covers manufacturing defects: if a repair meets the maintenance standards, DUOTTS says it will repair the bike and bear the related parts and labor costs, and for issues outside the warranty it will diagnose and send paid replacement parts or work with you to minimize the cost of a return repair. A 30-day return policy applies from the date you receive the bike, with minor defects handled through compensation and replacement parts; return shipping is not covered by DUOTTS. Early owner reviews on the official site average 5.0 out of 5 across 15 reviews, with riders highlighting the range, the brakes and the support team.
Slovenia follows the standard EU e-bike framework, so the version to order here is the EU specification: 250 W with assistance cutting out at 25 km/h. In that form the C29-K counts as an electrically power-assisted cycle (EPAC) rather than a moped — no registration, no insurance plate, no licence. The 750 W international version is a different machine legally and is not suitable for Slovenian public roads. We go into the detail in our guide to Slovenia e-bike laws in 2026.
The practical question is whether 170 km is real. Treat it as a best-case figure measured with light assistance and a light rider, as DUOTTS itself notes. But even discounted heavily, a 37.5 Ah total capacity changes the rhythm of ownership: it is the difference between charging nightly and charging twice a week, which is what makes a car-free week in Ljubljana realistic rather than aspirational.
Slovenia follows the standard EU e-bike framework, so the version to order here is the EU specification: 250 W with assistance cutting out at 25 km/h. In that form the C29-K counts as an electrically power-assisted cycle (EPAC) rather than a moped — no registration, no insurance plate, no licence. The 750 W international version is a different machine legally and is not suitable for Slovenian public roads. We go into the detail in our guide to Slovenia e-bike laws in 2026.
The practical question is whether 170 km is real. Treat it as a best-case figure measured with light assistance and a light rider, as DUOTTS itself notes. But even discounted heavily, a 37.5 Ah total capacity changes the rhythm of ownership: it is the difference between charging nightly and charging twice a week, which is what makes a car-free week in Ljubljana realistic rather than aspirational.
Below are the full specifications behind this DUOTTS C29-K review, taken from the official product page.
DUOTTS C29-K — key specifications (source: DUOTTS official product page)
| Specification | Details |
|---|---|
| Motor | 48 V brushless; 250 W (EU version) / 750 W (international version); torque 65 Nm |
| Battery | Dual battery 48 V 15 Ah + 48 V 22.5 Ah (37.5 Ah total) |
| Chargers | 54.6 V 2 A + 54.6 V 3 A; charging time 6–8 hours |
| Range (official) | Up to 170 km in assist mode (marketing: up to 200 km; pedal-assist 150–170 km) |
| Top speed | 25 km/h (EU version) / 45 km/h (international version) |
| Max climbing angle | 30 degrees |
| Pedal assist | Speed sensor, 5 levels (0–5), plus half-twist throttle |
| Riding modes | Regular cycling, pedal-assist, pure electric |
| Transmission | Shimano Tourney 3 × 7-speed (21 gears), with rear derailleur protector |
| Brakes | Hydraulic disc brakes, 160 mm rotors front and rear |
| Tires | Chaoyang 29 × 2.125-inch, 30 TPI, with inner tubes |
| Fork | Aluminum suspension fork, 100 mm travel, with lockout |
| Display | 2.4-inch HD display, Bluetooth (DUOTTS app) |
| Headlight | 300-lux LED headlight (manual switch) |
| Rear rack | Steel, max load 25 kg |
| Bike weight | 32.5 kg |
| Bike size | 1860 × 1080 × 680 mm |
| Rider height | 170–200 cm; saddle height 95–103 cm |
| Max load | 150 kg |
| Water resistance / cert | IPX4; CE certified |
| Price (at writing) | €1,199 (RRP €1,279); coupon DUOTTS-C29K saves €30 |
The DUOTTS C29-K delivers exactly what it promises: enormous range, strong torque and genuinely useful everyday features at a price that undercuts most long-range rivals. The dual-battery system removes range anxiety in a way few e-bikes in this class can match, and the standard hydraulic brakes, 21-speed drivetrain and 29-inch wheels make it a serious machine rather than a gimmick. It is best suited to delivery riders, long-distance commuters and taller riders who want one bike that does everything — provided you have somewhere practical to store a 32.5 kg full-size e-bike. For the right rider, the C29-K is outstanding value.
How far can the DUOTTS C29-K really go?
The official specification rates it at up to 170 km in assist mode; DUOTTS' marketing materials claim up to 200 km. Real-world range depends on rider weight, terrain, wind and assist level.
Is the C29-K street legal in Europe?
The EU version is — 250 W with 25 km/h assist, CE certified. The 750 W international version is not suitable for EU public roads; order the EU version for European riding.
How long does it take to charge?
6–8 hours, using the two included chargers (54.6 V 2 A and 54.6 V 3 A).
Who is the C29-K designed for?
Riders from 170–200 cm tall, with a 150 kg load limit — ideal for long commutes, delivery work and touring.
What warranty and shipping are included?
2-year warranty on manufacturing defects, free shipping from DUOTTS' Polish warehouse (3–7 business days), and a 30-day return policy.
Is the DUOTTS C29-K legal on Slovenian roads?
Yes, in EU specification: 250 W with assistance limited to 25 km/h and CE certification. It is then treated as a power-assisted bicycle. The 750 W international version is not street-legal in Slovenia. See Slovenia e-bike laws in 2026 for the full picture.
How long does delivery to Slovenia take?
DUOTTS states free shipping from its Polish warehouse with 3 to 7 business days in transit, which covers Slovenia.
Is a Chinese e-bike a sensible buy in Slovenia?
We have looked at this question in detail already — read our take on whether Chinese e-bikes are worth it in Slovenia for the standards, warranty and support angle before you commit.
This DUOTTS C29-K review is part of our series on Chinese e-bikes for Slovenian riders. If you are weighing the C29-K against more conventional city bikes, it also helps to be clear on the differences between a bicycle and an e-bike first, and to compare it with the picks in Top 5 e-bikes in Slovenia for commuting.
