Ventus Ryuga 81kW Motor | By Ventus Bikes VTB | For Sur Ron Ultra Bee
Overview
The Ventus Ryuga 81kW Hairpin Motor is the ultimate no-compromise performance upgrade for the Sur Ron Ultra Bee. Engineered specifically around the Ultra Bee chassis, this motor installs as a true plug-and-play replacement with no modifications required. When paired with the Ventus Aetos V9600 controller, it unlocks over 81 kW of peak power and up to 114 Nm of torque for instant response, extreme acceleration, and precise control at every speed.
Designed for riders who demand maximum output, durability, and razor-sharp throttle behavior, the Ryuga 81kW turns the Ultra Bee into a competition-grade EMoto with performance far beyond factory limits.
Technical Specifications
Peak Power: 60.3 kW at 72V, 81 kW at 96V
Peak Torque: 114 Nm at 1400A, 73 Nm at 850A
Protection Rating: IP67 water and dust sealed
Pole Pairs: 4
Max Efficiency: 95 percent
Insulation Class: 250°C
Temperature Sensor: NTC 10k B3905
Position Sensor: Encoder ABZP
Cooling Method: Natural air cooling
Tested Top Speed: 180 km/h at 72V, 195 km/h at 96V (46T sprocket, 62.5 cm wheel)
Weight: 12.5 kg
Dimensions: Φ173 × 180.8 mm
Phase Wire Gauge: 35 mm²
Max RPM: 14,000 rpm
KV Value: 118
Motor Type: Hairpin winding
Product Model: RGA81
Compatible Bikes: Ultra Bee only
Performance Highlights
The Ryuga 81kW’s performance curves on page 3 show massive torque available from near-zero RPM with extremely stable power delivery through mid and high ranges. Efficiency maps confirm high efficiency up to 95 percent across real riding conditions.
92.8 Nm torque available as low as 500 rpm
Over 60 kW at 72V and 80+ kW at 96V
High efficiency throughout 2,000–12,000 rpm range
Designed to maintain power under continuous load
Why Choose the Ryuga 81kW?
Built specifically for the Ultra Bee platform
True plug-and-play fitment—no fabrication or adapters
Hairpin stator technology for maximum power density
High RPM ceiling for extended high-speed riding
High phase wire gauge (35 mm²) for extreme current handling
Fully sealed IP67 construction for wet and dusty environments
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