Bonnell 805 vs. 902: Engineering, Geometry, and Ride Dynamics Breakdown

The choice between the Bonnell 805 RX and the upcoming Bonnell 902 is not simply a matter of choosing the “better” bike. Instead, it comes down to selecting between two entirely different design philosophies.

Bonnell built the 805 as a razor-sharp, mid-sized machine designed to bridge the gap between heavy electric mountain bikes and full-size dirt bikes. The 902, by contrast, is a full-scale, uncompromising performance bike designed to compete directly with premium 450cc motocross machines.

If you are ready to make a purchase but are unsure which platform best suits your terrain, riding style, or physical build, this technical breakdown explains the key differences in geometry, powertrain configuration, suspension performance, and battery architecture.

The most immediate difference between these two machines is their physical footprint and frame geometry.

The Bonnell 805 RX features a nimble 53-inch wheelbase, making it slightly smaller than a traditional 250cc or 300cc petrol dirt bike. It weighs approximately 218 pounds and comes equipped with an 18-inch rear wheel and a 21-inch front wheel as standard.

This shorter footprint makes the 805 exceptionally agile and easy to manoeuvre. Riders can move through tight single-track trails, pivot around closely spaced trees, and throw the bike into corners with minimal physical effort.

The Bonnell 902 is a larger and more stable platform, featuring an adjustable wheelbase ranging from 56.5 to 57.6 inches. Its overall size sits just below a Stark Varg but is significantly larger than a Sur-Ron Ultra Bee.

This extended footprint is engineered for high-speed tracking. When riding through deep loam, high-speed desert whoops, or large motocross triples, the 902’s chassis helps resist deflection and delivers the planted stability required at high speeds.

Both bikes use specialised powertrains co-developed with EBMX, but they are tuned to deliver significantly different riding experiences.

The Bonnell 805 RX operates with an EBMX X30 controller, producing a claimed peak output of 56 horsepower, or 42 kW, and up to 594 lb-ft, or 805 Nm, of rear-wheel torque.

Because of its lighter weight and electronic clutch mechanism, which directly ramps phase amps to create a mechanical clutch feel, the 805 delivers immediate and responsive low-end torque. It is particularly effective in hard enduro conditions, where riders need an instant burst of power to clear logs, ledges, or rocky sections without waiting for the motor to build revs.

The Bonnell 902 steps up to an EBMX X42 controller, producing a claimed 87 horsepower, or 65 kW, and more than 900 Nm of torque. This makes it one of the most powerful electric dirt bike powertrains announced.

Its power delivery is substantial and linear. While the 805 begins to reach its limits at a top speed above 80 mph, the 902 continues pulling aggressively beyond 90 mph with minimal tapering in power.

The way these bikes handle impacts depends heavily on their specialised SIRRIS suspension packages.

The Bonnell 805 RX comes equipped with a SIRRIS F43 inverted front fork and an R46 rear shock. Both ends provide 245 mm, or approximately 9.6 inches, of travel.

The bike uses a conventional motorcycle-style rear linkage and a hydroformed swingarm. This setup is tuned to remain plush and compliant over jagged rocks, roots, and technical trails while keeping the tyres connected to the ground for maximum traction.

The Bonnell 902 offers greater suspension modularity based on the rider’s discipline. It can be configured with an Enduro package providing 285 mm of travel or a full Race setup featuring large 48 mm SIRRIS forks and an R50 rear shock.

The Race package provides 310 mm of front travel and 320 mm of rear travel. It also includes hydraulic bump stops designed to manage the heavy bottom-out forces created by large freestyle jumps, hard landings, and aggressive motocross track riding.

The Bonnell 805 RX uses a tool-free, swappable 3.9 kWh Core battery as standard. A 4.7 kWh Race battery is also available as an upgrade.

The 3.9 kWh battery can be changed in approximately 30 seconds and is designed to provide more than three hours of technical hard enduro riding on a single charge, depending on riding conditions and power usage.

The Bonnell 902 introduces a three-tier modular battery system, allowing riders to alter the bike’s centre of gravity and overall weight according to their riding requirements.

The 4.7 kWh Sprint battery reduces the bike’s overall weight by approximately 15 pounds, making it suitable for short motocross heats. The 5.6 kWh Core battery provides a balance between performance and range, while the large 6.7 kWh Race battery is designed for extended desert races, long trail rides, and other applications where maximum runtime is important.

To select the right machine, consider your primary riding environment, preferred handling characteristics, and performance requirements.

You are primarily a hard enduro rider, woods racer, or technical trail enthusiast. The 805 is ideal if you prioritise a lightweight 218-pound frame, want a responsive electronic clutch for technical sections, and prefer a bike that feels effortless to manoeuvre in tight spaces.

You are a larger adult rider, a dedicated motocross racer, or a high-speed desert rider. The 902 is designed for riders who need a full-size chassis that tracks straight at speeds above 70 mph, maximum suspension travel of up to 320 mm for hard landings, and the intense acceleration provided by an 87-horsepower powertrain.

Do not let your preferred model move to the back of the waiting list. Whether you want the precise handling of the Bonnell 805 RX or the extreme power of the Bonnell 902 flagship, securing your build slot early can help ensure that your bike is ready for the next riding season.

At Ronster Bikes, build slots and package configurations are updated in real time. Check current production availability, customise your modular battery layout, and secure your order with the team today.