The shift towards electric bikes has transformed how we navigate cities, countryside lanes, and daily commutes—but not everyone wants to splash out on a brand-new e-bike. Enter conversion kits: a cost-effective way to breathe new life into your trusty two-wheeler. The ZAJCI 36V/350W 20-inch E-Bike Conversion Kit is one such solution, designed to make the switch to electric straightforward, reliable, and accessible—without compromising on performance or safety.
Installation: Simplicity for Every Rider
For anyone daunted by bike mechanics, this kit is a revelation. The hub motor comes pre-installed on a sturdy aluminum double rim, eliminating the need for complex wiring or wheel-building. All you need to do is remove your original tyre from its rim and fit it onto the kit’s wheel—a task that takes 15–20 minutes with basic tools (a tyre lever helps, but it’s not essential).
Sarah, a Manchester-based commuter, told us: “I’m not handy with bikes at all, but I swapped the tyre in 15 minutes. The instructions were clear, and the pre-assembled motor saved me hours of stress. I went from ‘I can’t do this’ to riding an e-bike the same day.”
That simplicity is a game-changer. No need for a professional mechanic—just basic DIY skills and a willingness to try.
Performance: The Right Boost for Everyday Rides
The 350W motor is perfectly sized for urban commutes, weekend jaunts, and gentle hills. It’s not built for off-road adventures or steep mountain climbs, but for the average rider, it delivers exactly what you need: a smooth, consistent boost that takes the edge off tired legs without feeling overpowered.
What sets this kit apart is the pedal assist sensor (PAS). Unlike throttle-only systems (which can cause wrist strain over long rides), PAS works with your pedal stroke: start pedaling, and the motor gradually adds power. You can still use the throttle for instant pushes (e.g., starting from a stop or tackling a short hill), but PAS keeps the ride natural and comfortable.
Mike, a Leeds-based teacher, said: “I use the pedal assist every day on my 5-mile commute. It takes the pain out of the hills without making me feel like I’m ‘cheating’—it’s just a helping hand. The throttle is great for when I’m running late, but PAS is my go-to.”
The 36V system pairs with a standard lithium-ion battery (not included—more on that later) for a range of 15–25 miles per charge (depending on terrain and usage). That’s more than enough for most daily rides.
Durability: Built to Last in UK Weather
The kit’s construction is tailored for the unpredictable British climate. The aluminum double rim is lightweight yet incredibly strong—capable of supporting up to 300 pounds (136kg). It’s rust-resistant, too, so you don’t have to worry about rain or snow corroding the wheel over time.
Other components, like the brake levers and display bracket, are made from stainless steel—combining corrosion resistance with durability. The motor housing is sealed to keep out dust and water (though it’s not fully waterproof—avoid deep puddles!).
Sarah, who’s used the kit for six months, added: “I’ve ridden through rain, snow, and daily commutes, and it’s held up flawlessly. The rim hasn’t scratched, and the motor still runs as smoothly as day one. It’s built to take a beating.”
That durability means you won’t be replacing parts every few months—a big win for cost-conscious riders.
Safety: No Corners Cut
Safety is non-negotiable, and this kit delivers. The integrated brake lever power cut-off is a standout feature: squeeze the lever, and the motor stops instantly. No more worrying about the motor continuing to power the wheel while you brake—a common hazard with cheaper kits.
The PAS sensor also has a gradual power delivery feature, so the motor doesn’t kick in abruptly. It adds power slowly as you pedal, keeping the ride stable and preventing skidding.
Mike, who had a close call with a pedestrian, noted: “The brake cut-off is a lifesaver. I squeezed the lever, and the motor stopped instantly—no skidding, no drama. It’s the kind of safety feature you don’t appreciate until you need it.”
The kit also includes reflectors and a secure handlebar mount for the display—small touches that add up to a safer ride.
LCD Display: Bright, Clear, and Packed with Data
The LCD display is a highlight. It’s bright enough to read in sunlight, with a backlight for night rides, and shows all the essential info at a glance:
- Battery level (so you never get stranded)
- Current, average, and maximum speed
- Total mileage and single-trip mileage
- Pedal assist level (1–3, depending on how much boost you want)
- Fault indicator (alerts you to issues like low battery or sensor problems)
The display mounts securely on the handlebars with a rubberized bracket—no rattling or movement while riding. You can cycle through settings with a single button press, making it easy to adjust on the go.
Sarah said: “I love checking my mileage at the end of the week. It’s motivating to see how much I’ve ridden, and the battery indicator means I never have to guess if I’ll make it home. The display is simple, but it has everything I need.”
Compatibility and Who It’s For
The 20-inch size is key—make sure your original bike has 20-inch wheels (common on folding bikes, urban bikes, and some kids’ bikes). The kit is unisex and works for riders of all heights, thanks to its adjustable handlebar mount and universal brake lever fit.
It’s ideal for:
- Commuters looking to save time and money on fuel/public transport.
- Casual riders who want to extend their range without buying a new e-bike.
- Anyone with a 20-inch bike who wants to upgrade without breaking the bank.
Minor Drawbacks (and How to Fix Them)
No product is perfect, but the issues here are minor:
- Battery Not Included: You’ll need to buy a 36V lithium-ion battery separately (make sure it has the right connector—most standard batteries work).
- No Waterproof Rating: The kit is water-resistant, but avoid deep puddles or heavy rain to protect the motor.
- Basic Display: It’s not as fancy as high-end e-bike displays, but it has all the essential info—no fluff.
These are easy to work around. A good battery costs £50–£100, and a waterproof cover (for the display) is a cheap add-on.
Customer Verdict: A Smart Investment
The reviews speak for themselves. Both Sarah and Mike have used the kit for months and swear by it. Sarah said: “Best purchase I’ve made this year. My old bike feels new again, and I save so much time on my commute.” Mike added: “I was skeptical about conversion kits, but this one exceeded my expectations. It’s reliable, safe, and fun to ride.”
Final Thoughts: Why This Kit Stands Out
The ZAJCI 36V/350W 20-inch Conversion Kit is a smart, affordable way to go electric. It’s easy to install, built to last, and packed with features that matter—like PAS, a safety cut-off, and a useful display.
If you have a 20-inch bike and want to join the e-bike revolution without spending hundreds on a new one, this kit is for you. It’s not the fanciest option, but it’s the most practical—and that’s what counts.
ASIN: B0CRNF6JFF
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