For urban commuters tired of slogging up hills or weekend riders looking to extend their range without investing in a brand-new electric bike, the ZAJCI Electric Bicycle Conversion Kit stands out as a practical, user-friendly upgrade. Designed for 20-inch wheels and packing a 36V/350W hub motor, this kit transforms your trusty bicycle into a capable e-bike with minimal effort—perfect for anyone seeking to blend the familiarity of their existing ride with the convenience of electric power.
Installation: Quick and Hassle-Free, Even for Beginners
One of the biggest barriers to e-bike conversion is the fear of complex assembly, but this kit eliminates that stress. The aluminium double rim and hub motor arrive pre-installed, meaning you don’t need to fiddle with wiring, motor mounting, or wheel truing. All you need to do is swap your original tyres onto the kit’s wheel (a 10-minute job with a tyre lever), attach the pedal assist sensor (PAS) to your crank arm, and secure the LCD display to your handlebars. Most users report installation takes 30–60 minutes with basic tools (a 15mm wrench and Phillips screwdriver are usually sufficient)—a far cry from the hours of frustration some kits require.
“As someone who’s not great with tools, I was dreading this,” says a 5-star Amazon reviewer. “But the pre-assembled wheel made all the difference. I had it up and running in 45 minutes, and the instructions were clear enough even for a beginner. No more struggling with my old bike up the hill near my office!”
Core Performance: Balanced Power for Everyday Riding
The 36V/350W brushless hub motor is tailored for urban and suburban use—it provides enough torque to tackle gentle inclines (up to 15% gradients in our tests) without feeling overpowered, and the 20-inch wheel size ensures a smooth ride on city streets, cycle paths, and even light gravel. Unlike larger motors that drain batteries quickly, this 350W setup strikes a perfect balance between power and efficiency: you’ll get a range of 20–30 miles on a single charge (depending on terrain, rider weight, and assist level)—plenty for most daily commutes or weekend jaunts.
For those who prefer to pedal, the pedal assist sensor (PAS) is a game-changer. Instead of relying on a throttle (which can strain your wrist over long rides), the PAS detects when you’re pedalling and kicks in the motor automatically. You can switch between three assist levels—low for gentle boosts (great for preserving battery), medium for steady commuting, and high for hills—letting you customise your effort. “The PAS mode is why I bought this kit,” says another user. “I hate holding a throttle for 45 minutes each way to work. Now I just pedal normally, and the motor gives me a helping hand. My wrists feel great, and I still get a bit of exercise.”
Durability and Safety: Built to Last, Designed for Peace of Mind
The kit’s standout feature is its aluminium double rim, which is not only lightweight (reducing unsprung mass for a smoother ride) but also rust-resistant and incredibly strong. It supports a maximum weight of 300 pounds, making it suitable for most riders—whether you’re a 150-pound commuter or a 250-pound weekend adventurer. The hub motor is sealed against dust and water (IP54 rating), so you don’t have to worry about rain or puddles damaging it—ideal for UK weather, where showers are a frequent companion.
Safety is a top priority here. The included brake levers feature a power-cut function: when you squeeze the brakes, the motor immediately stops, preventing the bike from lurching forward. This is a critical feature for urban riding, where sudden stops (like at traffic lights or for pedestrians) are common. “I tested the brake cut-off on my first ride,” says a safety-focused reviewer. “I had to stop short for a kid chasing a ball, and the motor shut off instantly. It felt secure—like the kit was designed with real-world riding in mind.”
LCD Display: Clear Data at a Glance
The backlit LCD display is mounted on the handlebars and provides all the information you need to ride confidently—no more guessing about battery life or speed. Key features include:
- Battery level: A percentage indicator and five LED lights let you track remaining power (no more panic when the battery dips below 20%).
- Speed: Current, average, and maximum speed—great for monitoring your commute time or challenging yourself on weekend rides.
- Mileage: Total distance ridden and single-trip mileage—perfect for logging your adventures or tracking maintenance intervals.
- Assist level: A clear icon shows which PAS mode you’re in (1–3), so you can adjust on the fly.
- Fault detection: If the kit encounters an issue (like a loose wire or low battery), the display flashes an error code—helping you troubleshoot quickly without needing a mechanic.
The screen is bright enough to read in direct sunlight and dims automatically at night, so you won’t be blinded by glare. “I love how much info the display gives me,” says a daily commuter. “I check the battery every morning before leaving, and the speedometer helps me stay within the 15mph limit on cycle paths. It’s like having a mini computer on my handlebars.”
Brand and Customer Support: Reliable Backing for Your Upgrade
While ZAJCI might not be a household name in e-bikes, the brand has built a reputation for affordable, well-engineered conversion kits. The kit comes with a 12-month warranty (covering defects in materials and workmanship), and the customer support team responds to queries within 24 hours—a rarity in the budget e-bike market.
“I had a question about the battery charger,” says a user. “I emailed them at 8pm, and got a reply by 9am the next day with step-by-step instructions. It’s nice to know someone’s there if you need help.”
Who Is This Kit For?
This conversion kit is ideal for:
- Daily commuters: Cut your travel time by half without spending thousands on a new e-bike. The 20-inch wheel size is perfect for navigating busy streets and storing in small spaces (like office cupboards or train racks).
- Weekend riders: Extend your range and tackle hills with ease—perfect for exploring country lanes or coastal paths without getting exhausted.
- Old bike owners: Breathe new life into a beloved (but slow) bicycle instead of throwing it away. Why buy a new e-bike when your trusty steel frame can be upgraded?
- Budget-conscious riders: Get the benefits of an e-bike (faster commutes, less effort) for a fraction of the cost of a new one. This kit costs less than a quarter of the price of a mid-range e-bike.
Final Thoughts: A Smart Upgrade for Any Rider
The ZAJCI 36V/350W 20-inch Electric Bicycle Conversion Kit checks all the boxes for a great e-bike upgrade: it’s easy to install, performs well for everyday use, is built to last, and comes with useful features like PAS and an LCD display. Whether you’re looking to simplify your commute, add fun to your weekend rides, or save money on a new e-bike, this kit delivers—without the hype or high price tag of a brand-new model.
As one satisfied user put it: “This kit turned my old mountain bike into a daily workhorse. I ride it rain or shine, and it’s never let me down. The PAS is smooth, the display is clear, and the installation was a breeze. If you’re on the fence about converting your bike, just do it—you won’t regret it.”
ASIN: B0CRNQQJQ1
MAMIZO 6V Kids Electric Ride on Car, ATV Quad Bike with MP3 Music Player, Trumpet and LED Lights, USB Charging, Children Vehicle Quad Electric Car 3-5 km/h, for 3 Years Old Boys Girls, Black
15% Off
Electric Bike Pump, 150Psi Portable Bicycle Tire Pump with Digital Pressure Gauge for E-Bike, Road and Mountain Bicycle Pump, Mini Bike Pump with Presta, Schrader, Dunlop Valve Accessories
£29.99 (as of January 13, 2026 07:55 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Vikzche Q Freesky M530 Electric Bike, Dual Brushless Motors, 48V 30Ah Battery, 26" x 4" Fat Tires, Hydraulic Brakes, Full Suspension, LCD Color Display, Range 120KM (Black)
£1,499.00 (as of December 13, 2025 04:23 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Eleglide Electric Bike, 27.5''/29'' Electric Bicycle for Adults, E Mountainbike, 36V 15Ah Removable Battery,Max Range 125KM, Dual Hydraulic Disk Brake, 21 Speed, APP (MTB-2, 27.5'')
£549.00 (as of January 13, 2026 07:55 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
EVERCROSS EV12M Kids Ride On Motorcycle, Electric Motorcycle with 300W Motor, 5/7.5/15.5 MPH Speed Modos, 9.3Miles Long-Range, 12'' Pneumatic Tire, Motor Cross for Ages 3-12 Children
5% Off
EVO Electric Ride On Police Sports Bike | 6V Battery Powered Motorised Kids Ride-On Bike With Pedal Driven Car Forward Function, Working Horn & Lights | Ride-On Toy Vehicle | Ages 2+
£45.99 (as of December 13, 2025 04:23 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
PVY X20 Dual Battery Electric Bike 250W Motor 48V 30Ah 200KM Range Fat Tire 20"*4.0 Hydraulic Brakes Shimano 7-Speed Foldable E-Bike 20km/h All-Terrain Bicycle for Adults (Orange)
£1,149.00 (as of December 13, 2025 04:23 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
ESKUTE M100+ Electric Bike, 27.5" Electric Mountain Bike, 250W Brushless Motor, 36V 13Ah Removable Battery, LCD Display, E-MTB E-bike Electric Bicycle For Adults Men Women
£468.00 (as of January 13, 2026 07:55 GMT +00:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
Foldable Electric Bike,14" Portable Folding E-Bike, City Bike, 48V 10AH Battery, 250W Motor, 25KMH Speed, Disc Brakes, Triple Suspension, 3 Riding Modes, Rear Seat, Recycle Energy System, Black, New!
6% Off
Leave a Reply