2025 Surron Ultra Bee 21kw Electric Dirt Bike

SurRon Ultra Bee 2025 – Now Faster!
The next evolution in electric off-road performance is here. The 2025 Ultra Bee pushes boundaries with a massive power upgrade, redesigned suspension, and high-efficiency motor tech—all while retaining the nimble ride feel SurRon is known for.

Power Upgrade – Now 21kW Peak
Tap into insane acceleration with the all-new Turbo Mode, peaking at 21kW and maintaining 18kW continuous in Sport Mode. That means 0–31mph in just 2 seconds, or a blistering 1.1 seconds to 18.7mph off the line.  The 2024 outgoing model peaked at just 12.5kw.  While that was plenty, this is a huge and fully welcomed upgrade!  

New Features & Improvements

• Turbo Button: Unleashes full 21kW peak power
• Crawling Function: Fine control for technical off-road terrain
• Upgraded Battery: 74V60Ah for extended range and punch
• Advanced MTPA/MTPV Controller: Smarter power delivery
• Hairpin Motor: Improved efficiency & rapid heat dissipation
• 0–59mph Top Speed: Lightweight but ferocious
• New Suspension System:
  • 50% stronger gold fork with uniform wall thickness
  • Upgraded damping and hydraulic buffers for 30% better impact resistance
• Primary Drive Overhaul:
  • Carbon fiber belt + forged pulleys
  • Tungsten carbide pulley surfaces with 3x wear resistance

Range & Charging

• Range: 70 miles (at a reduced speed)
• Charge Time: 20% to 80% in just 2.5 hours

Design & Aesthetic Enhancements

• Sleek new sand-gold body color or Carbon Black
• Gold-accented front fork and guard plate decals
• New custom 18" rear wheel set
• Slight weight increase (up 8 lbs) for added durability and power delivery
• Available in Carbon Black or Desert Brown

Ride Modes
Eco / Daily / Sport / Reverse / Turbo
Plus 3-level adjustable crawling control

Specs

• Motor: PMSM w/ MTPA/MTPV Controller
• Max Power: 21kW (Turbo) / 18kW (Sports)
• Max Torque (on wheel): 376.9 ft-lbs
• Battery: 74V / 60Ah Lithium-ion
• Top Speed: 59mph
• Seat Height: 35.8 in
• Ground Clearance: 12.4 in
• Wheelbase: 54.3 in
• Frame: Forged aluminum alloy
• Front Tire: 80/100-19 Off-Road
• Rear Tire: 100/90-18 Off-Road
• Front Fork Travel: 9.4 in
• Rear Shock Travel: 3.3 in (Wheel Travel: 9.4 in)
• Throttle Curve: Three settings
• Rider Weight Capacity: 220 lbs
• Weight: 195 lbs (dry)

Smart Features

• SRTC + BERS assist systems
  

Local Pickup or Freight Shipping
In-store pickup is available at our San Francisco shop. Freight shipping also available—setup fees may apply for shipped bikes.  We charge an optional $150 setup fee to remove from the metal crate and assemble.  No freight fees to ship if you select in store pickup.

Instructions: Settings and ASR Setup

1. Power On and Enter Settings Mode

• With the kickstand down, power on the bike.
• Hold the Ready and ASR buttons (front-facing buttons on the right and left grips) for 3 seconds until the display shows a letter B and a number.

2. Navigating Settings

• Tap ASR to move to the next setting.
• Tap Ready to change the setting value.

3. Settings Overview

• BO B5: Brake regeneration (activates when battery is under 95% in Sport mode)
• EO E5: Engine coasting regeneration
• A1 A3: Anti-Slip traction control (ASR)
• PO P1: Pause throttle when brake is applied
• 8 C1: Crash cutoff (C1 disables motor if bike tilts too far)
• F1 F3: Throttle sensitivity in Sport mode
• TO T1: Testing mode (records diagnostics)
• U1 U3: Charging speed control for utility power

How to Set Up ASR (Anti-Slip Traction Control)

1. Activating ASR

• To enable ASR for steep slopes or slippery conditions, press the ASR button three times in a row.
• The ASR light will turn green to indicate it's active.

2. ASR Strength Levels

• The right-side instrument shows ASR strength:
  • One bar: Lightest assistance (still allows short wheelies)
  • Three bars: Maximum traction control

3. Adjusting ASR While Riding

• To toggle ASR on/off while riding: press the ASR button three times.
• To adjust strength while riding: hold ASR and then double-click the reverse (r & s) button.

These instructions help you get the most out of your Ultra Bee’s advanced electronic systems and traction control.