GreenBike Big Dog Extreme Folding Fat Tire Ebike

6 reviews

FREE Shipping within the Contiguous US
DAILY Inventory Updates
CALL for Local Professional Assembly Options

Black with Gold
Black with Red and Silver
Black with Red and Gold
White with Silver
Black with Orange
Black with Silver
White with Red

Customer Reviews
5.0 Based on 6 Reviews
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Perfect Fit

I was in need of a nice folder that I could keep in my trunk and I stumbled upon this Big Dog Extreme from Really Good Ebikes and it turned out to be perfect for my outdoor needs. This ebike ticks off everything on my list and the long-range battery is a big plus.

Kevin S.
Dominica Dominica
Really Good Ebikes

Thanks for the review.

Awesome Ebike

I just received my new Big Dog Extreme from Greenbike and I have to say, so far it does seem live up to its name. The first thing I noticed was the power on this bike, and I can't wait to get on some trails with this Dog.

Greg S.
Dominica Dominica
Really Good Ebikes

Thanks Greg.

Fat Folder w/ Tons of Torque

The Big Dog is a great fat tire folding ebike for the off road. Its motor is very powerful, and I felt like the fat tires gripped the trail well. Thanks.

Garth L.
United States United States
Really Good Ebikes

Thank you Garth.

Awesome Off-Road Fat Tire Ebike

The Big Dog Extreme is a very competent off-road electric fat tire bike. I'm 6'-4" and 240 lbs, so I was concerned that the bike would be too small for me. But it fits perfect, and has enough motor power for my weight. I'm very please with this fat folder.

Gary P.
Mexico Mexico
Big Dog Fun

Man, I'm digging my new Extreme Big Dog. This dog is the pitbull of ebikes. It's got tons of power, super fun to ride. Shaka bra.

Brody G.
Really Good Ebikes

Thanks Brody, you def have a way with words.

Hydraulic Disc Brakes w/ Auto Motor Inhibitors

High-Torque 750W Rear Hub Motor

Pedal Assist & Thumb Throttle

Long-Range Battery

Big Dog Extreme Fat Tire Ebike Description

If you're looking for an affordable fat folding ebike with full suspension, the Big Dog Extreme might be the perfect fit. It's got tons of power, premium components throughout, and an incredible build quality. 

The Big Dog Extreme can handle riders up to 6'-5" and 250 Lbs., so it's a perfect off-road ebike for the outdoor adventurer. The 750W rear hub motor will power you up steep hills, and the 48V/15Ah battery will extend your range with each charge.

Big Dog Extreme Specifications

  • Model Year: 2021
  • Use Case: Urban Jungles, Remote Trails, Sunny Beaches
  • Frame: 6061 Aluminum Alloy Foldable Full-Suspension Frame w/ Adjustable Stem Height
  • Fork: Mozo USA Suspension Fork w/ 140mm Travel
  • Motor: 750W High-Torque Rear Hub Geared Motor by 8Fun (a Bafang brand)
  • Drive Modes: Speed (Cadence) Sensor Pedal Assist System w/ 5 Levels of Assist, Right-Side Class 2 Thumb Throttle, 6-Speed Shimano Gearing
  • Removable Battery: Easy-Access 48V/15Ah Li-Ion Battery w/ Boston Power Cells (for estimate range per charge, please refer to our Ebike Range Calculator)
  • Charge Time: 5-6 Hours
  • Brakes: Green Bike Electric Motion Hydraulic Disc Brakes w/ 160mm Rotors & Automatic Motor Inhibitors
  • Tires: 20" x 4" Fat Tires by Innova
  • Seat Post: Suspension Seat Post w/ 27.2mm Travel
  • Display: LCD-5900 Ebike Intelligent Display w/ Battery Level, Speed, Assist Level, Odometer and Trip Distance Readouts
  • Weight Capacity: 300 Lbs.
  • Folded Dimensions: 45" x 39" x 24"
  • Crank: 170mm w/ 28-33-42T
  • Bike Weight w/ Battery: 61 Lbs.
  • Warranty: 1 Year
  • Lights: Battery Operated Front and Rear LED Lights

Electrified Reviews

We love it when an independent ebike reviewer covers one of the bikes we carry. Check out the review of the Extreme by our friend Brent McCluskey from Electrified Reviews. Brent says:

"This is a folder with some attitude, and honestly, it’s just a great ride all around. We’ve reviewed quite a few electric bikes from Green Bike and this company does an excellent job at picking and choosing the right components. And the Big Dog Extreme is no exception. This folding electric bike is powerful, fast, compact and perhaps most importantly, it’s comfy." Not bad!

Here's a video of the ebike being unpacked and assembled. Super easy.

Here's a video showing how to fold and unfold your electric folding ebike. Awesome.

Here's a video showing how to get set for a perfect ebike ride. Be safe out there.


  • Orders for in-stock items take 24-48 hours to process, then about 5-7 days in transit. Delays due to Covid have occurred. If an item is on backorder, the estimated ship date will be shown below the Pre-Order Button.
  • All products are shipped free within the Contiguous US via UPS, FedEx or similar carrier. Shipping to AK, HI and PR may incur additional charges.
  • If your package appears damaged from shipping, please do not accept it. Tell the driver to keep the package and contact us immediately at 888-883-3350. We offer Route Package Protection to ensure against lost, stolen or damaged goods. Click here to learn more about Route.
  • Returns for buyer’s remorse are typically not accepted by our suppliers, and if accepted, the customer may incur shipping and restocking fees.
  • Please click here to read our entire Shipping & Returns Policy.


Ask a Question
  • Hi I just bought a Big Dog extreme from your store, I am 6'4" and need a longer seat post. My knees are really close to the handle bars as well... I have the handle bars as high as they will go... Do you have any suggestions? Ted.

    Thank you for your recent purchase. There are a number of long seat posts that can fit the Extreme, just make sure to select the 30.4mm diameter post. Here is an example of a product that would fit:

  • What is the step over height