Stealth Bomber Electric Enduro Bike Frame

1. Core Definition & Design Origin
The Stealth Bomber bike frame is a heavy-duty, fully integrated monocoque e-bike frame built exclusively for high-power off-road electric enduro bike conversions, widely used for 3000W–12000W rear drive hub motors (QS motor, Sabvoton controller systems, KKE suspension and high power batteries).
Its naming derives from stealth military bombers: sharp angular contour, fully enclosed central battery & controller cabin, zero exposed wiring, delivering a sleek, low-profile aerodynamic silhouette with industrial ruggedness. Unlike standard mountain bike diamond frames, it abandons traditional triangle structures and adopts a single-piece box-shaped load-bearing main body + independent rear swingarm layout, engineered to withstand extreme torque, jumps, rough trails and high-speed off-road riding.

2. Frame Material & Structural Craftsmanship
2.1 Main Body Material (Standard Version)
1) Primary material: 2mm thick carbon steel / high-tensile iron plate, full internal & external anti-rust phosphate + electrostatic powder coating.
2) Reinforcement: Thickened triangular gussets at head tube, swingarm pivot and seat mount to disperse motor torque stress.
3) Outer cosmetic covers: Scratch-resistant ABS+PMMA glossy plastic, detachable for battery/controller maintenance.
2.2 Welding & Production Standards
Full robotic continuous welding eliminates weak solder joints; all stress-bearing seams are double-welded. The whole frame kit weight reaches 18.2–23kg (without battery pack), prioritizing torsional rigidity over lightweight performance — critical for heavy-load 72V high-voltage e-bikes.

3. Integrated Internal Cabin Layout (Core Advantage)
The biggest differentiation from ordinary frames is the fully concealed internal compartment, splitting into two independent sealed zones:
1) Lower Battery Compartment
Large hollow cavity compatible with large-capacity lithium packs (72V 29Ah / 35Ah / 40.6Ah / 44.8Ah / 48Ah / 53Ah Panasonic/Samsung/EVE cells special for high power systems). Mounted at the frame’s lowest center, drastically lowering overall gravity for stable high-speed cornering and steep hill climbs.
2) Upper Controller Storage Bay
Custom enclosure for Sabvoton, FOC sine-wave controllers, with reserved wire routing holes. All power, throttle, PAS and brake cables run internally, no loose external wiring to wear or short circuit off-road.
All covers fasten with quick-release bolts, balancing stealth appearance and accessible maintenance.

4. Off-Road Optimized Geometry & Suspension Compatibility
4.1 Key Geometry Parameters
1) Head tube angle: 65° slacker than regular MTBs, stabilizes front wheel during downhill descents and aerial landings.
2) Seat tube angle: 75°, centralizes rider weight for heavy torque climbing.
3) Extended chain stay: 470mm, avoids pedal strike on rocky terrain and boosts rear wheel traction.
4) Bottom bracket drop: 45mm lower than standard bikes, improves balance with heavy battery load.
4.2 Suspension Interface
1) Rear shock mounting: Dual-position top shock lugs, supports 200mm coil shocks (DNM, KKE T3 motorcycle-grade dampers). Adjustable mounting holes let builders tweak frame geometry for street riding or aggressive enduro jumps.
2) Rear swingarm dropout: Two mainstream specifications — 150mm / 170mm spacing, fully compatible with high-power hub motors for 19inch or 21inch motorcycle-style off-road wheels.
3) Bottom bracket: Standard 68mm threaded BB shell, fits common 170mm crankset assemblies.

5. Complete Frame Kit Standard Accessories
A full Stealth Bomber frame package includes all structural hardware for direct DIY assembly:
1) Main monocoque frame body
2) Rear flat swingarm with dropout axle sleeves
3) Detachable battery & controller plastic covers
4) Reinforced seat post bracket
5) Integrated head tube headset base
6) Full bolt, bearing, washer and wiring grommet set
7) Optional matching front air suspension fork (lockout adjustable travel)

6. Power & Application Compatibility
6.1 Motor Compatibility Range
Designed for high-torque industrial e-bike setups, covering your mainstream product line:
1) Low-power daily build: 3000W rear drive hub motors with 80A+ Sabvoton controllers.
2) Mid-range off-road: 5000W / 6000W QS rear drive hub motors with 100A+ Sabvoton controllers.
3) Extreme speed builds: 8000W–12000W high-current rear drive hub motors with 150A+ Sabvoton controllers.
6.2 Applicable Scenarios
1) Off-road enduro, forest trails, sand/beach dirt riding
2) High-speed street legal electric moped conversions
3) Heavy-load battery-powered delivery e-bikes
4) Custom DIY performance e-bike projects for wholesale clients
6.3 Limitation Note
Due to thick steel construction and heavy integrated battery housing, it is not suitable for lightweight urban commuter builds focusing on portability; it targets customers prioritizing raw power, crash resistance and hidden component aesthetics.

7. Aesthetic & Customization Options
Standard factory color finishes: Matte black and glossy white; full custom paint/vinyl wrapping supported for bulk wholesale orders. The sharp polygonal body panels deliver the iconic “stealth aircraft” visual feature, highly recognizable among e-bike enthusiasts and resellers.

8. Pros & Cons Summary
Advantages
1) Ultra-high structural rigidity, resistant to deformation under big jumps and heavy motor torque
2) Fully internal wiring & battery design, clean stealth look, reduced cable damage
3) Low central gravity layout improves riding stability at high speeds
4) Universal compatibility with most high-power e-bike motor/battery/controller brands
5) Modular kit design, easy for factory assembly and client DIY modification

Packing items for this model stealth bomber electric enduro bike frame:
1. Stealth bomber electric enduro bike frame
2. Side panels
3. Headset parts
4. Rear swing fork
5. Key ignition
6. Triangle saddle tube bracket
7. Screws and nuts

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