For many cyclists, the idea of converting a beloved regular bike into an e-bike is appealing—why spend hundreds on a new electric model when you can upgrade your existing ride? The ZAJCI Electric Bicycle Conversion Kit (36V/350W, 20-inch) addresses this need with a blend of ease, functionality, and reliability that’s winning over both DIY beginners and seasoned riders.
Effortless Installation: No Expertise Required
One of the kit’s biggest selling points is its pre-assembled design. The hub motor comes already fitted to an aluminium double rim, meaning you don’t need to wrestle with wiring, motor mounting, or complex tools. All you have to do is swap your original bike’s tyres onto the kit’s wheel—a process most users complete in under an hour, even with zero bike maintenance experience.
“I took less than 60 minutes to install it, and I’ve never touched a bike’s mechanics before,” says a 5-star Amazon reviewer. “The pre-built motor wheel saved me so much time—I just popped my old tyres on and was riding within an hour.” This simplicity eliminates the intimidation factor for first-time converters, making e-bike ownership accessible to everyone, not just gearheads.
Pedal Assist Sensor (PAS): Natural, Wrist-Friendly Riding
The kit’s pedal assist function is a game-changer for anyone who finds throttle-only e-bikes uncomfortable. Unlike constant throttle use—which strains wrists over long rides—the PAS detects your pedalling motion and delivers a smooth boost, letting you ride “semi-electrically” without sacrificing the feel of a regular bike. You can switch between two modes:
- Pedal Assist: Ideal for uphill climbs, headwinds, or long commutes—no wrist strain, just natural, assisted pedalling.
- Throttle Mode: Perfect for quick starts or when you want to take a break from pedalling.
“The PAS is why I bought this kit,” says a daily commuter. “I used to hate throttle-only e-bikes because my wrist would ache after 5 miles. Now, I just pedal, and the motor gives me a push when I need it—feels like I’m riding a normal bike, but easier.”
Durability & Safety: Built to Last, Designed to Protect
Durability is a priority here. The motor wheel and rim are crafted from aluminium—lightweight, rust-resistant, and capable of supporting up to 300 pounds. This makes the kit suitable for riders of all sizes, from casual users to heavier commuters.
“I’ve been using it for 4 months, commuting 12 miles a day, and the rim still looks brand new,” says a user. “No rust, no loose parts—even after riding through rain and mud.”
Safety is equally well-considered. The kit includes a brake-lever power-cut feature: when you squeeze the brakes, the motor automatically cuts power, preventing unintended acceleration and ensuring a smooth, controlled stop. This small but critical design choice reflects ZAJCI’s focus on user safety—a must for any e-bike component.
Multi-Function LCD Display: Smart, Informative, User-Friendly
The LCD display is the kit’s “brain,” providing real-time data to enhance your ride:
- Battery Level: Avoids “range anxiety” by showing exactly how much power you have left.
- Speed Metrics: Current, average, and maximum speed—great for tracking performance or staying within legal limits (the 350W motor tops out at ~15.5 mph, compliant with UK e-bike regulations).
- Mileage: Total and single-trip mileage—perfect for planning commutes or leisure rides.
- Gear Display: Adjusts the level of pedal assist (e.g., low for flat roads, high for hills).
- Fault Alerts: Notifies you of issues like loose wiring or low battery immediately.
“The LCD is a game-changer for my weekend rides,” says a leisure cyclist. “I can see how much battery I have left before heading back, and the trip mileage helps me explore further without worrying about getting lost. The gear display lets me dial down the assist when I want a workout or crank it up for steep trails—total control.”
Real-World Performance: Perfect for Commutes, Trails, and Families
The 36V/350W motor strikes a balance between power and efficiency. It’s strong enough to handle moderate hills (up to 15% gradients, per user tests) without draining the battery too quickly, and the 20-inch wheel size fits most 20-inch bikes—common in folding models, kids’ bikes, or smaller adult frames.
- Commuters: Cut down on travel time and avoid public transport—one user says, “I used to take the bus for 45 minutes; now I ride 10 miles in 25 minutes, and I arrive less stressed.”
- Leisure Riders: Explore further without fatigue—“I can now ride to the next town (15 miles away) and back, something I could never do on a regular bike,” says a weekend rider.
- Families: Make rides accessible for everyone—“My 12-year-old uses it to keep up with me on trails, and my mom uses it to ride to the grocery store—no more complaining about hills!”
Customer Feedback: 5-Star Praise for Ease and Reliability
Amazon customers consistently rate the kit 5/5, with comments highlighting its simplicity and performance:
- Installation: “Took me less than an hour to swap the tyres and get it going—even with zero experience in bike maintenance.”
- PAS: “The pedal assist is a game-changer; I don’t have to strain my wrist with the throttle, and it feels more natural than full-electric modes.”
- Durability: “I’ve been using it for 3 months, commuting 10 miles a day, and the aluminium rim still looks brand new—no rust, no loose parts.”
- Value: “Why buy a new e-bike for £800 when I can convert my existing one for a fraction of the cost? This kit has all the features I need.”
Trustworthy Brand: 24-Hour Support for Peace of Mind
ZAJCI’s customer service adds an extra layer of confidence. The brand promises a 24-hour response time for questions or issues—a rarity in the budget e-bike kit market. One user who had a minor wiring question says: “I emailed them at 8 PM with a problem about the LCD connection, and they got back to me with a step-by-step guide by 9 AM the next day. It was fixed in 5 minutes—excellent support.”
Minor Considerations: What to Know
- Battery Sold Separately: Like most conversion kits, the battery isn’t included—allowing you to choose a model that fits your budget and range needs (most users opt for a 10Ah or 12Ah battery for 20–30 miles of range).
- Throttle Responsiveness: A few users mention the throttle could be slightly more sensitive, but this is a minor nitpick compared to the overall positive experience.
Final Verdict: A Smart, Affordable Upgrade
The ZAJCI 36V/350W 20-inch E-Bike Conversion Kit is a standout choice for anyone looking to breathe new life into their regular bike. Its easy installation, natural pedal assist, durable construction, and useful LCD display make it suitable for beginners and experts alike. Whether you’re commuting to work, exploring local trails, or just wanting to make rides easier for the whole family, this kit delivers on its promise of a “brand new e-bike” experience—without the cost or hassle of buying a new one.
ASIN: B0CRNCV8NL
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