For cyclists seeking to electrify their existing bicycles, the 36V 250W/350W Electric Bike Conversion Kit offers a versatile solution. Designed to accommodate a broad range of wheel sizes—from 20-inch to 29-inch, including 700C—this rear-wheel brushless hub motor kit caters to commuters, mountain bikers, and road cyclists alike. Its dual power output (250W and 350W) provides flexibility for varying terrain and regulatory requirements, making it a compelling option for those transitioning to electric-assisted cycling. Below, we delve into its technical specifications, compatibility, and performance, contextualised within real-world applications.
Technical Specifications and Build Quality
At the core of this conversion kit is a brushless hub motor, engineered for durability and efficiency. Brushless motors are favoured for their reduced maintenance needs and quieter operation compared to brushed counterparts. The 36V system strikes a balance between power and energy consumption, compatible with standard lithium-ion batteries commonly available in the e-bike market. Riders can choose between 250W and 350W configurations, with the former adhering to UK regulations for public road use (15.5 mph assist limit) and the latter suited for off-road or private land applications where higher torque is advantageous.
The motor integrates seamlessly into the rear wheel, preserving the bicycle’s original geometry. This design minimises disruption to handling characteristics, a critical factor for mountain bikers who rely on precise control during technical descents. The kit includes a waterproof controller, thumb throttle, brake levers with motor cutoff sensors, and a LCD display for monitoring speed, battery level, and assist mode. Notably, the absence of a proprietary battery system allows users to pair the motor with third-party batteries, offering flexibility in range and budget.
Compatibility and Installation
One standout feature is the kit’s compatibility with diverse wheel sizes. Cyclists with 700C road bikes or 29-inch mountain bikes report straightforward installations, citing clear instructions and standardised components. The hub motor’s spoke flange design accommodates existing rims, though some recommend professional wheel-building for optimal tension and truing. The inclusion of torque arms ensures secure mounting on frames with vertical dropouts, a detail praised by users who prioritise safety during high-power acceleration.
Installation time varies with mechanical aptitude, but most describe the process as manageable with basic tools—a wrench set, screwdrivers, and tyre levers. The plug-and-play wiring harness reduces complexity, though routing cables neatly through the frame may require patience. Commuters appreciate the discreet appearance post-installation, as the hub motor’s low-profile design avoids drawing undue attention—a practical consideration for urban riders storing bikes in public areas.
Performance on Varied Terrain
In real-world testing, the 250W configuration delivers adequate assistance for flat to moderately hilly routes, aligning with UK legal requirements. Riders note a smooth power delivery from a standstill, with the pedal assist system (PAS) providing natural-feeling augmentation. The throttle override proves useful for navigating steep inclines or accelerating from traffic lights, though prolonged use at maximum power drains batteries faster.
The 350W variant, while not road-legal in the UK, garners praise for off-road performance. Mountain bikers highlight its ability to tackle loose gravel and 10-15% gradients without overheating, attributing this to the motor’s efficient heat dissipation. The brushless design’s lack of friction also contributes to sustained performance during long climbs. Both power modes feature five assist levels, allowing riders to tailor energy consumption to journey length.
User Experiences and Practical Considerations
Feedback from commuters emphasises the kit’s reliability in daily use. One rider mentions commuting 20 miles daily with minimal battery consumption in PAS level 2, underscoring the system’s efficiency. The LCD display’s readability in direct sunlight and the ergonomic thumb throttle are frequently cited as user-friendly features. Another user praises the brake cutoff sensors for enhancing safety, as the motor disengages instantly when braking—a critical detail for stop-start urban traffic.
Mountain bikers value the motor’s unobtrusive weight distribution. At approximately 3.5 kg for the rear hub, the added weight is centralised low on the frame, preserving the bike’s agility. Trail riders report improved confidence on technical ascents, with the motor’s torque compensating for fatigue during long rides. However, a minority note that the kit’s weight slightly affects the bike’s responsiveness on fast descents, a trade-off inherent to hub motors.
Road cyclists transitioning to electric assistance appreciate the kit’s silent operation, which maintains the tranquil nature of road riding. The PAS’s sensitivity to pedalling input receives positive remarks, with no noticeable lag between pedal strokes and motor engagement. This seamless integration encourages consistent cadence, particularly beneficial for long-distance riders managing endurance efforts.
Battery and Range Considerations
While the kit excludes a battery, its 36V compatibility allows pairing with packs ranging from 10Ah to 20Ah. Users report ranges of 25-50 miles depending on assist level, terrain, and battery capacity. The inclusion of a battery level indicator on the LCD display aids in trip planning, with one commuter noting the importance of voltage-based accuracy over vague percentage estimates.
Regulatory and Safety Compliance
The 250W version aligns with UK Electrically Assisted Pedal Cycle (EAPC) regulations, requiring riders to pedal for motor engagement and limiting assistance to 15.5 mph. Users emphasise adhering to these rules for road legality, while the 350W option is reserved for private land use. The motor’s compliance with IP65 water resistance standards ensures functionality in wet conditions, though users advise applying dielectric grease to connectors for prolonged water exposure.
Conclusion
This electric bike conversion kit stands out for its adaptability across disciplines and wheel sizes. Its brushless hub motor offers a balance of efficiency and durability, while the dual power options cater to diverse cycling needs. Commuters benefit from its discreet design and regulatory compliance, whereas mountain and off-road riders leverage the higher torque output for challenging terrain. The exclusion of a proprietary battery system grants users budgetary flexibility, though careful selection of a quality battery is recommended for optimal performance.
While no system is without compromise—the added weight marginally affects handling dynamics—the overall package provides a cost-effective entry into electric cycling. Its compatibility with existing bicycles supports sustainable transportation goals, allowing cyclists to modernise their rides without discarding trusted frames. For those seeking a reliable, adaptable conversion solution, this kit merits consideration.
ASIN: B0D93WXWJ1
OneSportLife C29 Electric Bike, 29'' E-Mountain Bike with 48V 15Ah Removable Battery & 250W Powerful Motor, Professional 21-Speed with LCD Display, Electric Commuter Bicycle for Adults Men and Women
8% Off
JANSNO Electric Bikes for Adults with 65Nm Motor, 48V/14Ah New upgraded battery and Dual Shock Absorber, 20" x 4.0 All-terrain wide tire Electric Bicycle, Multiple performance modes can be unlocked
£799.00 (as of June 28, 2025 02:37 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, M1 Plus 27.5‘’/29'' E Mountain Bike, Electric Bicycle for Adults, Commute E-bike with 12.5Ah Removable Battery, LCD Display, Dual Disk Brake, Specialist 21 Speed (Inches, 27.5)
14% Off
URLIFE 14" Electric Bike, Portable E-bike with 48V 7.5AH Removable Battery 250W Powerful Motor, 60 KM Max Range, Folding Ebike LCD Display, Electric Commuter Bicycle for Adults and Teens(Black)
£389.99 (as of June 27, 2025 06:40 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.)
Finbike EB3 Electric Bike for Adults, 100KM Max Range, 3-4H Fast Charging, 26inch Electric Mountain Bike with Removable Battery, Front Fork Suspension, 7-Speed Derailleur, 150KG Capacity Ebike
11% Off
DYU A5 Electric Bike, 14" Portable Electric Bike, 48V 7.5AH Removable Battery,60KM Max Range, Folding Ebike with LCD Display, Remote Control,Shock Absorption System,Dual Disc Brakes,for Adults/Teens
17% Off
URLIFE 20"*3" Electric Bikes for Adults, Fat Tire Mountain Bike E20 with Colorful LCD Display, 48V 13AH Removable Battery, 7-Speed Derailleur 80-100KM Max Range Ebike Commute MTB BLACK
£549.99 (as of June 14, 2025 05:39 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.)
GSOU 26" Electric Bikes for Adults. 2603 E-Bike with 250W High-Speed Mid-Drive Brushless Motor. Electric Bicycle Built-in 36V-8AH Removable Li-Ion Battery, 7-Speed, LCD Display, Dual Disc Brake
£449.99 (as of June 28, 2025 02:37 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.)
Ebikes for Adults,13Ah Battery 40-70Km Range,Hidoes B10 Fat Tire Electric Bike for Adults Up to 25Km/h, 60N·M Motor Electric Bicycle Retro E Bike,with Leather Bags,20" Offroad Tire
£799.00 (as of June 28, 2025 02:37 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.)
Leave a Reply