For years, riders have been asking for a bridge between the lightweight agility of the Light Bee and the raw power of gas 250s. The original Ultra Bee was close, but the 2025 Surron Ultra Bee II has officially kicked down the door. With a massive jump to 21kW peak output and a dedicated 18-inch rear wheel setup, Surron isn’t playing fair anymore—they are redefining the category.
The 2025 model isn’t just a cosmetic refresh; it is a significant hardware overhaul designed for serious enduro and trail riding.
1. Significant Power Upgrade (21kW)
The headline feature is the power. The previous generation was punchy, but the 2025 model pushes 21kW peak power in Turbo Mode. While Turbo is designed for short bursts (10-15 seconds) to clear massive jumps or hill climbs, the sustained 18kW output makes technical climbing significantly easier. It feels less like a mountain bike and more like a dedicated motocross machine.
2. Bigger Battery, Better Range
Power is nothing without range. Surron has equipped the 2025 Ultra Bee II with a larger 74V 60Ah Lithium-ion battery. This upgrade combats range anxiety, offering a realistic 40-50 miles of aggressive riding. If you are just cruising trails at 25mph, you could see upwards of 80 miles.
3. The 19/18 Wheel Setup
Listening to community feedback, Surron dropped the uniform 19-inch wheels for a classic dirt bike setup: 19-inch front and 18-inch rear. This allows riders to fit a wider variety of high-performance off-road tires on the rear for superior traction in mud and sand.
Weighing in at approximately 195 lbs, the chassis retains that signature Surron flickability. However, the addition of the SRTC (Surron Traction Control) and the new Crawl Mode changes the game for technical terrain. If you get stuck on a steep incline, Crawl Mode helps you inch out without looping the bike, while the Reverse gear is a lifesaver in tight single-track dead ends.
Suspension and Braking
The suspension is improved, handling the extra torque well, though heavy hard-enduro riders might still want to tune the forks. The regenerative braking is fully adjustable, allowing you to dial in how much engine braking you want—perfect for descending steep grades without overheating your pads.
Pros and Cons
Pros
Cons
Massive 21kW peak power upgrade
Turbo Mode limited to short bursts
74V 60Ah Battery for extended range
Stock suspension may need tuning for pros
18-inch rear wheel for better tire options
Price is creeping toward gas bike levels
New Crawl and Reverse modes
High demand causes availability issues
Fast charging (20-80% in 2.5 hrs)
Who is the 2025 Ultra Bee II For?
This bike is the perfect sweet spot for intermediate to advanced riders. If you feel the Light Bee is too small but a full-sized Storm Bee or Stark Varg is too heavy (or expensive), the Ultra Bee II is your answer. It is nimble enough for tight woods but fast enough to keep up with gas bikes on open trails.
Final Verdict
The 2025 Surron Ultra Bee II is arguably the best pound-for-pound electric dirt bike on the market right now. The move to a 19/18 wheel set and the 21kW power bump addresses almost every complaint from the previous generation.
Ready to experience the torque? Don’t wait for the backorder list to grow.
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