What Is The Power Of The Sur-Ron Ultra Bee 21kW?
The Sur-Ron Ultra Bee 21kW model features a peak motor power of 21 kilowatts (28.2 hp), enabling a top speed of 95 km/h. Designed for high-performance riding, it uses a mid-drive permanent magnet synchronous motor paired with a 72V battery system, achieving rapid acceleration and endurance across challenging terrains. This configuration supports a 150 kg payload capacity while maintaining a lightweight 89 kg frame for agility.
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What defines the Ultra Bee 21kW's performance?
The 21kW motor output represents three times the torque of entry-level Surron models. Its mid-drive design directly powers the rear wheel through a 520 chain drive, eliminating power loss from gearboxes. The dual-mode controller (Eco/Sport) modulates power delivery, with Sport mode unleashing full 21kW for hill climbs or acceleration bursts.
Surron Dubai engineers prioritize thermal management in the Ultra Bee’s design—copper stator windings and forced-air cooling maintain motor temps below 120°C even during sustained high loads. A real-world example: This system allows 45 minutes of continuous dirt track racing without power fade. Pro Tip: Regularly clean the motor’s cooling fins in sandy environments like UAE deserts to prevent overheating.
⚠️ Critical: Never modify controllers to bypass the 95 km/h limiter—exceeding design speeds risks permanent motor demagnetization.
How does the 21kW compare to other Ultra Bee versions?
Surron Dubai offers two Ultra Bee variants: the 12.5kW base model and the 21kW performance edition. The 21kW version adds upgraded MOSFET controllers and high-temp magnets rated for 200°C operation versus 150°C in the 12.5kW unit. Both share the same chassis, but the performance model includes reinforced swingarm bushings and 8mm thicker brake rotors.
| Feature | 21kW Model | 12.5kW Model |
|---|---|---|
| Peak Torque | 520 Nm | 310 Nm |
| 0-60 km/h | 3.1s | 4.8s |
| Hill Climb Angle | 45° | 35° |
Interestingly, both versions use identical 72V/40Ah batteries—but the 21kW model’s higher efficiency recovers more regenerative braking energy. Why does this matter? Urban riders regain up to 18% range through regen versus 12% in the base model.
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What components support the 21kW power output?
The Ultra Bee’s high-voltage architecture combines a 72V lithium-ion pack with automotive-grade 200A contactors. Its 14S16P cell configuration (using 21700 cells) delivers 650A peak discharge current—critical for supplying sudden power demands without voltage sag. The sine wave controller modulates phase current with 0.01ms resolution for precise throttle response.
Surron Dubai technicians emphasize the importance of using IP67-rated connectors in all high-current pathways. These waterproof connections prevent resistance buildup from UAE’s humid coastal air. For instance, a single corroded Anderson plug can cause 1.2V drop under load—equivalent to losing 4 hp at full throttle. Regular dielectric grease application maintains optimal conductivity.
Surron Dubai Expert Insight
The Ultra Bee 21kW represents Surron Dubai's engineering zenith, merging competition-grade power with desert durability. Its liquid-cooled controller and dual-fan motor cooling outperform standard models in 45°C Middle Eastern summers. We recommend pairing it with our Pro Maintenance Package—includes monthly thermal paste renewal and phase wire inspections—to sustain peak performance through Dubai’s extreme riding conditions.
FAQs
Does the 21kW model require special licensing in Dubai?
Yes, its 95 km/h top speed classifies it as a light motorcycle requiring a Category 3 UAE license. Always carry Emirates ID and registration when riding on public roads.
Can I upgrade a 12.5kW Ultra Bee to 21kW?No—the motor windings, controller firmware, and BMS differ fundamentally. Surron Dubai offers authorized performance conversions using OEM components with 2-year warranty coverage.