HappyRun G300 Pro
A 72-volt, 6,500W dirt bike for about half what a Surron costs. I went in expecting not to like it, and the frame and suspension are miles ahead of the price.
Make It Yours
Colour Options
Check availability →
Watch the Review
Full Video Review
Watch on YouTube →
Out on the Bike
The G300 Pro in the Wild
Up Close
Detail Gallery
The Engineering
What You Actually Get
6,500W Peak, and It Accelerates Uphill
A 72V direct-drive hub rated 3,000W nominal and peaking at 6,500W. The hill test is the tell: most bikes bleed speed on the way up and this one gained it, pulling to 30 mph mid-climb.
City Mode and Off-Road Mode
Two modes rather than a menu full of them. City caps at 28 mph. Off-road opens it to the quoted 50 mph. Ben measured 45 mph on the GPS at 200 lb.
Suspension Well Past the Price
A 120mm inverted fork with compression and rebound adjusters, and an 80mm coil out back with preload and rebound. Ben called the frame and suspension miles ahead of what he expected and said it feels damped rather than springy.
Four-Piston Brakes, Mounted Backwards
Four-piston calipers, which is more than most bikes here get, but on a 180mm rotor up front and a 203mm at the back. That is the wrong way round, and from 28 mph it only just stopped at the marker. A bigger front rotor is a 50 to 100 dollar fix and the first thing Ben would change.
Keyed Power and a Keyed Battery
One key turns the battery on, another releases it from the frame. Nobody is riding it away without both.
Motorcycle Spokes and an IPX5 Frame
Heavy-gauge motorcycle spokes to carry the weight, a one-piece aluminium frame, and an IPX5 water rating.
Do the Maths
Your Range, Not Mine
Brand range figures assume a light rider being gentle. Set it up the way you actually ride.
The Numbers
Full Specifications
Source: happyrunsports.com →⚡ E-System
🚦 Performance
🔧 Chassis & Brakes
✨ Features
The Bike Cave Verdict
Ben's Take
I went into this one expecting not to like it. A cheap Surron clone is usually cheap everywhere it matters. The G300 Pro is not. The frame feels like a tank, and the suspension is miles ahead of what I expected at this money: a proper 120mm inverted fork with compression and rebound, and a coil out back that is damped instead of springy. It made 45 mph on the GPS against a 50 mph claim, and on the hill it actually gained speed rather than losing it. I did 23.9 miles and was still on half the battery, so 40 plus is realistic. The one thing I would change is the brakes, and not because they are bad parts. They are four-piston calipers, which is more than most bikes here get. They are just mounted with the big rotor at the back and the small one up front, which is backwards, and from 28 mph it only just stopped at the marker. A bigger front rotor is 50 to 100 dollars and it would transform the bike.
👍 What I loved
- 45 mph on the GPS against a 50 mph claim
- Gained speed going uphill instead of bleeding it, pulling to 30 mph mid-climb
- 23.9 miles ridden and still on half the battery
- 120mm inverted fork with real compression and rebound adjusters
- Frame and suspension quality well past what the price suggests
- Four-piston calipers, which is rare at this money
- Two keys: one for power, one to release the battery
- Fits riders from 5'1" to 6'5"
👎 What to know
- The 180mm front and 203mm rear rotors are the wrong way round
- Only just stopped at the marker from 28 mph
- A bigger front rotor is the first thing to budget for
- Plastic pedals and short cranks
- No way to add battery capacity, 30Ah is what you get
- 136 lb is heavy to load into a truck
Frequently asked questions
How fast is the HappyRun G300 Pro?
HappyRun quote 50 mph. Ben measured 45 mph on the GPS at around 200 lb. Pedal assist caps out at 40 mph. City mode holds it to 28 mph and off-road mode opens it up.
What range does it actually get?
Ben covered 23.9 miles and was still on half the battery, which puts 40 plus miles within reach. HappyRun claim 60. His own rule of a mile per amp-hour on a 30Ah pack lands at 30 to 40 depending on rider weight and how hard you ride.
Why is the front brake rotor smaller than the rear?
Good question, and Ben asks it on camera. The G300 Pro runs a 180mm rotor up front and a 203mm at the back, which is the opposite of how weight transfers under braking. From 28 mph it only just stopped at the marker. A larger front rotor and an adapter costs 50 to 100 dollars and is the single best upgrade for the bike.
Is the suspension any good at this price?
It is the part that surprised Ben most. A 120mm inverted fork with compression and rebound adjustment, and an 80mm coil shock with preload and rebound. He described the frame and suspension as miles ahead of what he expected.
What sizes of rider does it fit?
HappyRun say 5 foot 1 to 6 foot 5. At 5 foot 9 Ben could reach the ground flat-footed on both sides, and reckons the quoted range is about right.
Is there a discount code?
Yes. TBC100 takes $100 off at checkout on happyrunsports.com.