The Ebsenopower MTX39 Rear Wheel Ebike Conversion Kit represents a compelling proposition for cyclists seeking to electrify their existing mountain or hybrid bikes. Designed for riders who demand power, versatility, and adaptability, this 72V 3000W rear hub motor system has garnered attention within the UK cycling community for its robust specifications and broad compatibility. Below, we explore its engineering merits, real-world performance, and the aspects that make it a noteworthy contender in the realm of DIY electric bike conversions.
Core Specifications and Build Quality
At the heart of the MTX39 kit lies a 3000W rear hub motor, a figure that positions it firmly in the high-performance category. Operating on a 72V system, this motor promises substantial torque output, making it suitable for steep inclines, off-road trails, or riders carrying heavy loads. The aluminium construction of the hub and rim ensures durability without excessive weight, a critical balance for mountain biking applications where both resilience and agility matter.
The kit’s compatibility with wheel sizes ranging from 24” to 29” underscores its versatility. Cyclists with older mountain bikes or hybrid frames will appreciate the flexibility to match their existing setup, whether retrofitting a compact 24” wheel or a larger 29” model for improved rollover capability. The 2-inch rim width further enhances stability, particularly when paired with wider tyres commonly used in off-road scenarios.
A notable technical detail is the dual dropout spacing options: 135mm for single-speed freewheel configurations and 152mm for 7-speed setups. This accommodates a range of drivetrain preferences, though prospective buyers should verify their frame’s clearance, as wider dropout spacings may require modifications on certain bicycles.
Installation and Integration
Ease of installation is frequently cited as a strength of this system. The plug-and-play design simplifies the conversion process, with many users reporting successful installations within a few hours using basic tools. The inclusion of a disc brake-compatible hub ensures compatibility with modern braking systems, a safety imperative given the motor’s power output. However, some cyclists have advised allocating additional time for fine-tuning the drivetrain alignment and torque arm placement to prevent wheel slippage under heavy acceleration.
One recurring observation relates to the necessity of sourcing a compatible tyre and tube separately. While this allows riders to select tread patterns and puncture protection suited to their terrain, first-time converters should factor this into their planning. The absence of a pre-installed tyre also necessitates careful attention to spoke tensioning during assembly, as uneven tension could compromise wheel integrity over rough surfaces.
Performance and Ride Characteristics
In practical use, the 3000W motor delivers on its promise of brisk acceleration and hill-climbing prowess. Riders transitioning from lower-powered systems often remark on the immediate torque delivery, which enables confident overtaking on shared paths or tackling technical ascents where momentum is crucial. The direct drive hub design contributes to a smooth power curve, though the lack of regenerative braking may disappoint those accustomed to mid-drive systems with energy-recovery features.
The motor’s performance in wet conditions has drawn praise, with multiple users noting reliable traction and minimal power loss during rainy commutes or muddy trail rides. This resilience is likely attributable to the IP65-rated waterproofing, though regular maintenance of electrical connections remains advisable for long-term reliability.
Compatibility Considerations
While the MTX39’s multi-wheel-size support is undeniably advantageous, cyclists should carefully assess their frame geometry before purchase. The added weight of the rear hub motor (approximately 9.5kg) subtly alters a bike’s handling dynamics, particularly on full-suspension frames where unsprung mass can affect suspension performance. Rigid or hardtail mountain bikes generally adapt better to this conversion, maintaining predictable handling characteristics.
Battery selection, though beyond the scope of the kit itself, warrants careful consideration. A 72V system demands a substantial battery pack to fully exploit the motor’s capabilities, with many users opting for 20Ah-30Ah configurations to balance range and weight. Integrating a quality battery management system (BMS) is strongly recommended to safeguard against voltage sag during high-load scenarios.
User Experiences and Practical Insights
Feedback from the cycling community highlights several consistent themes. The motor’s silent operation at cruising speeds surprises many, contrasting with the whine characteristic of some lower-quality hub motors. However, a minority report noticeable vibration during maximum throttle input, suggesting that controller tuning or firmware updates could further refine the user experience.
Long-term users emphasise the importance of periodic maintenance, particularly regarding spoke tension and axle nuts. The single-speed freewheel option has proven popular among urban commuters seeking simplicity, while the 7-speed variant appeals to touring cyclists requiring gear versatility. Several riders have successfully paired the system with torque sensors for a more natural pedal-assist feel, though this requires additional components beyond the base kit.
Regulatory and Safety Notes
Prospective buyers should remain mindful of local e-bike regulations. While the 3000W output caters to private land use or jurisdictions with higher power allowances, public road compliance may necessitate power limiting via the controller. The inclusion of a brake cutoff sensor would enhance safety for road-legal applications, though its absence in the standard package may prompt aftermarket modifications by safety-conscious riders.
Conclusion
The Ebsenopower MTX39 conversion kit excels as a high-torque solution for cyclists unwilling to compromise on power or compatibility. Its ability to transform diverse bicycle frames into capable electric platforms makes it particularly appealing for enthusiasts maintaining multiple bikes or those with niche frame sizes. While the lack of included tyres and the learning curve associated with high-power systems may deter absolute beginners, mechanically inclined riders will find substantial value in its adaptable design and robust construction.
For those seeking to electrify mountain bikes for trail use, overhaul commuter bikes for urban dominance, or simply experiment with high-performance DIY ebike builds, this kit provides a compelling foundation. Its balance of raw power and configurable components ensures relevance across multiple cycling disciplines, provided users respect its capabilities through appropriate gearing, battery selection, and routine maintenance.
ASIN: B0DS612GN4
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