The lines defining electric powersports have officially blurred. For years, off-road enthusiasts had to make a clear choice: buy a traditional, battery-powered electric mountain bike (e-MTB) with mild pedal assistance, or step up to a heavier, throttle-actuated light electric motorcycle. This left a massive vacuum for riders who craved the pure, uninhibited torque of an e-moto but demanded the ultra-lightweight, geometric finesse of a world-class downhill mountain bike.
The arrival of the first-generation Bonnell 775 MX shook the industry by packing a jaw-dropping 6,000 watts of peak power into a downhill frame. It was brilliant, but it pushed bicycle components to their absolute structural limits.
Now, the launch of the Bonnell 775 MX V2 marks a massive evolutionary step. The V2 addresses early real-world feedback with heavy-duty structural reinforcements, refined drivetrain engineering, and a shifting component landscape that cements this machine as a true hybrid pioneer.
At RonsterBikes, we skip factory press releases to focus purely on real-world engineering metrics. We took the new V2 directly to steep single-track loops, rock gardens, and high-speed jump trails to see if these upgrades live up to the hype. This comprehensive review breaks down the powertrain architecture, chassis geometry, V2 hardware improvements, and real-world handling characteristics to help you decide if this ultra-premium hybrid belongs in your garage.
Direct Spec & Feature Comparison: V1 vs. V2
To understand how much engineering effort went into updating this platform, let’s look directly at the factory configurations side by side:
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Engineering Metric / Feature
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First-Generation Bonnell 775 MX
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Electrical Architecture
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65V system / 1,300 Wh pack
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65V system / 1,300 Wh Samsung 50S cells
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Powertrain Setup
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CYC X1 Pro motor
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CYC X1 Pro Gen 4 (upgraded reduction)
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Peak Power Output
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6,000 watts
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6,000 watts
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Peak Torque Output
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250 Nm
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280 Nm at the crank
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Curb Weight
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Approximately 75 lbs
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Approximately 75 lbs (reinforced components)
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Rear Suspension Setup
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Air rear shock
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Suntour Voro custom coil rear shock
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Front Fork Assembly
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Suntour Rux 38 RC+ (200mm travel)
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Suntour Rux 38 RC+ (upgraded internals)
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Rear Wheel Spokes
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Standard 14-gauge spokes
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Heavy-duty 13-gauge spokes
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Rim Construction
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Pin-jointed rims
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Welded rim design (tubeless-ready)
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Flat Prevention
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Standard inner tubes
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Factory Tannus Armour inserts
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Crank Arm Length
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165mm cranks
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Shorter 155mm cranks
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Chain Tensioner Mounting
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Standard dropout frame mount
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Universal Derailleur Hanger (UDH) mount
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Powertrain Architecture: The CYC X1 Pro Gen 4 Heartbeat
At the absolute center of the Bonnell 775 MX V2 is its specialized powertrain. Instead of building a heavy hub motor or a bulky motorcycle-style motor case, Bonnell utilizes the highly advanced CYC X1 Pro Gen 4 motor system. This system runs on a high-output 65V electrical architecture fed by an internal 1,300 Wh battery pack comprised of premium Samsung 50S cells.
What makes this powertrain arrangement so unique is its dual-drivetrain layout. The right side of the bike retains a traditional, independent mountain bike chainline allowing for legitimate pedal-assist operation. The left side houses a dedicated, high-tensile motor chain that links directly from the internal planetary gear reduction to the rear hub sprocket.
The results on the trail are staggering. The Gen 4 motor delivers a massive 6,000 watts of peak power and 280 Nm of torque directly at the crank. Because the bike weighs a mere 75 lbs, its power-to-weight ratio is completely off the charts.
When testing the V2 at RonsterBikes, our riders noted that cracking the sensitive CNC aluminum twist throttle results in an immediate, physics-defying surge of forward momentum. It doesn’t crawl up hills like a traditional e-MTB; it launches up vertical mountain faces with the aggressive, roost-throwing authority of a 125cc two-stroke dirt bike, all while remaining quiet enough to preserve trail peace.
What Makes It a V2? Tracking the Critical Structural Upgrades
While the motor remains an absolute powerhouse, the first-generation bike suffered from minor component fatigue when subjected to extreme off-road abuse. The V2 addresses these challenges directly through heavy-duty engineering upgrades.
1. Transitioning to a Custom Coil Rear Shock
The original version came equipped with a high-end air rear shock. While air shocks are excellent for traditional, lightweight mountain bikes, they struggled under the combined thermal stress of a 6,000W motor and a 75-lb chassis during long, punishing descents.
The V2 replaces this setup with a custom-tuned Suntour Voro Coil Rear Shock. Shifting to a coil layout provides a highly linear damping curve that eliminates fading caused by heat buildup. The V2 tracks flawlessly through deep braking bumps, maintaining rear tire traction when you pin the throttle out of loose corners.
2. Bulletproofing the Rear Wheel: 13G Spokes and Welded Rims
Dumping 280 Nm of torque straight to a bicycle hub will instantly expose any weakness in a wheel build. To combat broken spokes and wheel flex, the V2 steps up to thicker, heavy-duty 13-gauge spokes on the rear wheel paired with an upgraded lacing pattern and reinforced nipples.
Additionally, the rims feature a new welded design rather than older pin-joint configurations. This change improves lateral stiffness and creates a vastly superior seal for riders who want to run a tubeless tire configuration.
3. Shorter 155mm Cranks and Ground Clearance
With a low bottom bracket design mimicking an aggressive downhill race bike, the V1 was prone to pedal strikes when pedaling through technical, rocky terrain. The V2 fixes this by shortening the crank arms down to 155mm.
This 10mm reduction dramatically improves ground clearance, allowing you to maintain active pedal input over trail obstacles without worrying about clipping rocks. It also enables a quicker, more efficient pedal stroke when engaging the integrated torque-sensing pedal assist.
4. Integrated Tannus Armour Flat Protection
Because the Bonnell V2 can rocket past 40 mph over rugged terrain, hitting sharp square-edge rocks can result in pinch flats. Bonnell solved this issue by shipping the V2 factory-standard with Tannus Armour Tire Inserts pre-installed. These inserts cushion the inner tube or tubeless cavity, allowing you to run lower tire pressures for maximum traction without risking rim damage or flat tires.
Chassis Geometry and Stealth-Factor Dynamics
The true brilliance of the Bonnell 775 MX V2 lies in its physical profile and frame configuration. The front triangle is crafted from high-grade 4130 chromoly steel for elite compliance and strength, paired with 6061 aluminum seatstays.
Its geometry is pure downhill mountain bike: a slack 62.7-degree head tube angle provides incredible stability at high speeds, while adjustable chainstays (440mm to 452mm) allow you to tune the bike’s wheelbase for either tight agility or maximum high-speed tracking.
This geometry delivers an unmatched stealth factor on public trail systems. Because the battery pack is housed cleanly inside the main frame spars and the bike retains a sleek, bicycle-like silhouette, it draws zero negative attention.
When our test riders at RonsterBikes rode the V2 on multi-use public trails, hikers and other cyclists simply saw a premium downhill mountain bike. It bypasses the public backlash and regulatory land-access challenges that traditional e-motos face, giving you unrestricted access to trail networks that would otherwise be completely off-limits to throttle-driven machines.
Real-World Trail Impressions: Climbing Like a Moto, Descending Like an MTB
Riding the Bonnell 775 MX V2 requires a brief mental adjustment, but once it clicks, it redefines what is possible on two wheels.
On the climbs, it behaves exactly like a lightweight electric dirt bike. You can approach vertical rock gardens and steep single-track ascents with absolute confidence. The integrated torque sensor reads your pedal input seamlessly, matching your leg power with instantaneous electric reinforcement, or you can rely purely on the light-action twist throttle to blast up fire roads at 40 mph.
Once you point the front wheel downhill, the motor mass seamlessly disappears into the lower-center section of the frame. It stops handling like a heavy motorcycle and transforms back into a surgical downhill mountain bike. Weighing just 75 lbs, the chassis is highly responsive.
You can easily loft the front wheel over drops, pump through rhythm sections, and flick the rear end through tight switchbacks with a level of finesse that a 125-lb e-moto simply cannot match. Braking performance is equally elite, utilizing massive Magura MT5 4-piston hydraulic brakes on oversized floating rotors to drop speed instantly with excellent one-finger modulation.
The Final Verdict: Is the Bonnell 775 MX V2 Right for Your Garage?
The Bonnell 775 MX V2 is not trying to be a traditional mountain bike, nor is it trying to replace a full-size motocross machine. It occupies an entirely new hybrid category engineered specifically for riders who want elite, uncompromised off-road performance without boundaries.
•You should buy the V2 if: You want the ultimate stealth trail machine. If you love the handling and agility of a downhill mountain bike but hate the grueling exhaustion of steep climbs, or if you live near premium public trail networks and need a high-power machine that won’t attract regulatory focus or public complaints, the Bonnell 775 MX V2 is an absolute masterpiece built for your exact needs.
•You should look elsewhere if: You are looking for a heavy-duty street stunt machine to abuse on concrete, or want a massive, full-scale motocross bike built strictly for a closed racetrack.
The V2 upgrades have taken an already revolutionary platform and added the long-term structural durability required to handle serious off-road riding. It represents the absolute future of lightweight electric trail exploration.
Ready to Experience the Ultimate Downhill Hybrid?
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