HappyRun G300 SE Ultra Mid-Drive Electric Dirt Bike

The G300 SE Ultra fits the household stepping up from the G300 SE Mini to the full-size Ultra for one or more specific upgrades. A heavier rider close to the 350 lb max load (the highest in our HappyRun mid-drive line). A taller adult who finds the SE Mini's 29-inch seat too short. A weekend off-road rider on trails with larger obstacles where the 17-inch front wheel absorbs better than the SE Mini's 14-inch. A multi-rider household where the larger 1860Wh battery supports two riding sessions before recharge.

Other strong fits: a buyer who values the Pro-Grade Full Suspension's improved damping and longer service life. A rider who needs the higher top speed for routes that legally permit it. A budget-conscious off-road rider at the $1,599 sale price who would otherwise consider the F18 2.0 ($1,399) but prioritizes the Ultra's higher load capacity and larger battery over the F18 2.0's 2.0-generation safety features.

Skip the G300 SE Ultra when budget caps at $1,200 (the G300 SE Mini at $1,199 is the lower-tier mid-drive answer). Skip it when you want the F18 2.0's 2.0-generation safety features (reverse gear, NFC unlock, magnetic safety switch). Skip it when the F18 2.0's lower 26.5-inch seat fits your household's youngest rider better. Skip it when you specifically want the G300 Pro's hub-motor architecture and 50 mph top speed. Skip it when your routes are public roads or bike lanes (the G300 SE Ultra is not a standard state Class 1, 2, or 3 e-bike). Skip it when local OHV rules ban high-wattage electric off-road vehicles. Skip it when your household budget cannot absorb the additional $300 to $600 cost of full motocross protective gear.

The 60V 6000W peak mid-drive motor delivers 240 Nm (177 lb-ft) of torque and a 44 mph top speed. Mid-drive motor architecture places the motor at the bike's center of gravity and drives the rear wheel through the chain, which delivers better climbing efficiency, more consistent traction on loose terrain, and easier rear-wheel removal for tire changes than hub-motor designs. The precision-tuned 60V 35Ah controller delivers consistent power across the full speed range.

Forty-four mph top speed sits between the G300 SE Mini's 36 mph and the F18 2.0's 46 mph. The Ultra is the speed and torque step-up from the Mini at the same mid-drive architecture. Hill performance: 6000W peak with 240 Nm (177 lb-ft) torque handles sustained 12 percent grades comfortably with a 200 lb rider plus typical cargo. 15-plus percent grades will work the motor harder but stay capable.

The 17-inch front wheel (paired with the 14-inch rear) is the headline ride differentiator from the G300 SE Mini's 14-inch front. Larger front wheels absorb trail obstacles (rocks, roots, log-overs, drop-offs) better than smaller wheels, deliver more stable high-speed handling, and maintain better steering feel through tight terrain. The Pro-Grade Full Suspension (front hydraulic fork plus rear spring shock absorber) further smooths the ride. The suspension is upgraded over the G300 SE Mini's Standard Full Suspension package.

A 60V 31Ah battery powers the G300 SE Ultra. Total energy is 1860 watt-hours, which is the largest battery in our HappyRun mid-drive line (the F18 2.0 ships 1800Wh, the G300 SE Mini ships 1248Wh). The 60V system voltage matches the F18 2.0 and is higher than the G300 SE Mini's 48V. Higher voltage at the same current delivers more usable power and reduces voltage sag under heavy motor load. Flat desert OHV parks near Phoenix and Las Vegas sit at the top of that band. Steep mountain trails near Denver and Salt Lake City sit at the bottom.

HappyRun publishes 56 to 65 mile real-world range in the product page FAQ, which is unusually honest at this category. The 65 mile upper bound assumes a 170 lb or lighter rider in mixed pedal-and-throttle riding at moderate speeds. The 56 mile lower bound assumes more challenging conditions. Real-world range under aggressive off-road riding (frequent full-throttle acceleration, hill climbs, jumps, 180 lb rider with motocross gear, sustained 44 mph) lands closer to 28 to 42 miles per session.

The 60V 35Ah controller paired with the precision-tuned motor delivers smooth power delivery and efficient current draw. Charging follows the standard HappyRun mid-drive pattern (typically 7 hours from empty to full using the included HappyRun charger). Use only the included HappyRun charger. Charge in a dry ventilated area outside any living space. The U.S. CPSC Micromobility Information Center publishes safe charging practices that apply to every high-capacity battery in this category.

The G300 SE Ultra is sold and intended as an off-road electric dirt bike. It is not a standard state Class 1, 2, or 3 electric bicycle. The federal low-speed electric bicycle definition uses a 750W motor limit and 20 mph motor-powered speed limit. Many state Class 3 frameworks allow pedal assist up to 28 mph (Class 3 pedal-assist). The G300 SE Ultra exceeds both. Many states classify a 44 mph electric off-road vehicle as an off-highway vehicle (OHV) and require registration, OHV decals, trail permits, or a combination. Some states require liability insurance for OHV use and additional safety training for minor riders.

HappyRun does not publish UL 2271 (battery system) or UL 2849 (complete electrical system) certification on the current U.S. product page for the G300 SE Ultra. UL certification is uncommon on off-road electric dirt bikes that are not sold for on-road or shared-trail use. The IPX5 waterproof grade supports light-rain riding and water spray from any direction. It does not support submersion or pressure-washing. The 14 to 104 Fahrenheit working temperature range is published, which is helpful for cold-weather riding planning.

Required protective gear at the G300 SE Ultra's performance level is full motocross kit: DOT or Snell rated full-face helmet, motocross goggles, chest protector or body armor, knee and elbow guards or motocross boots with shin protection, motocross gloves. Total gear cost is $300 to $600. For younger riders sharing the bike with adults, gear sized for that rider matters more than adult-sized gear. Replace any gear that has experienced an impact crash. Verify state OHV registration, age and supervision rules for minor riders, and helmet requirements before any ride.

The box ships with the G300 SE Ultra at high pre-assembly (typical for motocross-format electric dirt bikes), a charger, basic tools, and an owner's manual. Package weight is 143 lb. Final assembly typically involves installing the front wheel and fender, the handlebars, the mirrors (if equipped), and any color-coded plastics. Pumping tires to manufacturer-spec pressure. And verifying battery state of charge plus brake fluid before first ride.

First-ride routine: confirm front and rear tire pressure with a gauge (motocross tires take 8 to 14 PSI depending on terrain and rider weight, consult the manual for the recommended range), verify both hydraulic brake levers feel firm before any roll, walk the front and rear suspension through full travel by hand, configure the digital display to your rider preferences, and start in a parking lot or empty paddock area to learn the throttle response before any trail ride. Practice braking from low speeds first to learn the hydraulic-disc bite characteristics. Save the 44 mph top speed for after 30 to 60 minutes of low-speed practice.

Ongoing ownership: mid-drive transmissions need chain lubrication every 200 miles or after wet/muddy rides (the chain transmits all motor power and wears faster than on a hub-motor bike). Motocross tires need pressure checks before each session and accept regular puncture risk. Carry a small pump and a spare tube. Inspect the hydraulic disc brake pads at 500 miles. The 14 to 104 Fahrenheit working temperature range matters: avoid riding in temperatures below 14 Fahrenheit (battery performance degrades significantly in extreme cold). HappyRun publishes a 2-year warranty and checkout-calculated continental-U.S. shipping. Confirm warranty term, freight responsibility on warranty returns, and customer-support contact path in writing on your order.

Motor and speed. 60V 6000W peak mid-drive motor. 240 Nm (177 lb-ft) peak torque. 44 mph top speed. Full-twist throttle. Chain-drive transmission. 60V 35Ah precision-tuned controller.

Battery and charging. 60V 31Ah battery (1860Wh, the largest in our HappyRun mid-drive line). 65 mile maximum range claim with 56 to 65 mile realistic range per HappyRun page FAQ.

Brakes and tires. Hydraulic disc brakes front and rear. 190 mm by 3.4 mm brake disc rotors. Off-road tires: front 17 inch, rear 14 inch.

Suspension. Pro-Grade Full Suspension: front hydraulic fork plus rear spring shock absorber (upgraded over the G300 SE Mini's Standard Full).

Frame and dimensions. High-strength carbon steel frame. 138 lb bike weight (without battery). 21.8 lb battery weight. Approximately 160 lb total with battery. 143 lb package weight. 350 lb maximum load (the highest in our HappyRun mid-drive line). 31.9-inch seat height. Recommended rider height 3'11" to 6'1" (1194 to 1854 mm). One size fits 3'11" to 6'1" riders.

Display, lights, environment. Digital display. 700-lumen LED headlight. Integrated taillight. IPX5 waterproof grade. 14 to 104 degree Fahrenheit working temperature range.

Pricing and support. Single single configuration. $1,599 sale price (regular $2,499, $900 / 36 percent off). checkout-calculated continental-U.S. shipping. 2-year warranty. 7-day return window with a 20% restocking fee.

At $1,599 sale (down from $2,499), the G300 SE Ultra is the full-size mid-drive step-up from the G300 SE Mini in the StreetRides HappyRun lineup. Six meaningful upgrades over the Mini define the Ultra: 6000W peak power, 44 mph top speed, 1860Wh battery (the largest in our HappyRun mid-drive line), 17-inch front wheels, Pro-Grade Full Suspension, and 350 lb max load (also the highest in our HappyRun mid-drive line). The published 56 to 65 mile real-world range in the manufacturer FAQ is unusually honest for this category.

The honest constraints are off-road only and lack of 2.0-generation safety features. The G300 SE Ultra is not a standard state Class 1, 2, or 3 e-bike. The 44 mph top speed and 6000W peak motor exceed standard low-speed e-bike class limits. Intended use is closed course, private property, or OHV-permitted trail under state OHV rules. The Ultra does not ship with the F18 2.0's reverse gear, NFC smart unlock, or magnetic safety switch lanyard. Real-world range under aggressive trail riding is 28 to 42 miles per session, not the 65 mile manufacturer maximum.

What matters on the ride: identity as a full-size mid-drive off-road electric dirt bike, peak motor power and torque, top speed, battery capacity and the unusually honest 56 to 65 mile range FAQ, brake hardware including rotor specifications, tire format, Pro-Grade Full Suspension package, the 31.9-inch seat height, the 3'11" to 6'1" rider-height range, the 350 lb max load, the 138 lb bike weight, the 21.8 lb battery weight, the 14 to 104 Fahrenheit working temperature, the IPX5 waterproof grade, the 700-lumen LED headlight, and the checkout-calculated continental-U.S. shipping. What to confirm before ordering: UL certification status (not published), the exact climbing-grade capability, the freight terms on warranty returns. Worth confirming before a $1,599 purchase decision and before committing to the additional gear and OHV-access infrastructure.