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  • commuter and LIGHT TRAIL RIDING

Energize your next trail-riding adventure with the 21 Sport. With a mountain bike-inspired frame and powerful motor, the Sport takes you from the trail to the urban jungle all on the same e-bike. Comfortable, stylish, and sturdy, this e-bike will last you for years to come.

Includes rear rack, fenders, integrated brake light, and LED front light. 

Suggested for riders: 5’6” - 6’4” and up to 275 lbs

Classification: Class 2 e-bike (up to 20 mph)

Why you'll love it:

  • Powerful enough to ride trails, hills, and pavement
  • Full throttle for a smooth ride
  • Customizable to fit your riding style

Ships in 1-2 business days

Estimated delivery: 1-2 weeks


All Espin e-Bikes come with a comprehensive 12-month warranty so you can buy with confidence.


All Espin e-Bikes come 95% assembled. All you need to do is put on the finishing touches.


We offer free shipping to 48 states in the US (excluding Alaska and Hawaii), delivered directly to your door.


Need help? Contact us via phone, email, chat. Our team is here to help.

An e-bike as adventurous and powerful as you are.


Motor Brand     


Motor Type 

Rear Mounted Geared Hub

Motor Nominal Output

500 watts / 800 peak output

Motor Torque

55 Nm

Battery Brand

Samsung Cells

Battery Voltage

48 volts

Battery Amp Hours

13.6 ah

Battery Watt Hours


Battery Chemistry


Battery Charge Time

6 hours

Riding Range Estimated Min
30 miles

Riding Range Estimated Max
50 miles

Display Type
Espin color display

Speed, Battery, Assist Level (1-5), Odometer

Drive Mode     
12 magnet sealed cadence sensing pedal assist

Top Speed     
Class 2


Attachment Points

Rear Rack bosses, Fender Bosses


Zoom Dual Piston Hydraulic Disc Brake, Front/Rear w/180mm Rotor; Zoom levers with Integrated Motor Cutoff


Alloy Cranks 170 mm, 45T Chainring with Plastic Bash Guard


100mm Travel Hydraulic Lockout

Frame Size


Frame Type

Double diamond


S-Ride 8 speed 13-32T

Hand Grips



Zoom Alloy Flat Handlebar 25.4mm




Wellgo Aluminum Alloy Platform

Rack Capacity

55 lbs (25kg) 15" x 5"


Selle Royal Freeway


Zoom 30.4mm


S-Ride triggers


CST 27.5 x 2.10


55 lbs


Locking Removable Battery Pack & Fenders

Size Guide


+ What's the difference between Espin's Flow and Sport e-bikes?

The Flow is a European inspired design built for the urban commuters who wants to zip through traffic and ride comfortably. Elegant 17” step through frame that allows you to mount and dismount easily and safely anytime you want.

The Sport comes in a 17 inch diamond frame and is for riders looking for a more sporty and aggressive riding style.

+ Does the Espin Sport model display have a USB port for charging devices such as a phone?

Yes, there is a USB port at the bottom of the color display.

+ What is an electric bike (e-bike) and what makes it different from a regular bike?

An electric bike is just like a regular bike, except for 4 main electrical components: the battery, motor, controller and display. Other than that, it will function and ride just like a normal bicycle. 

The Espin eBike is a pedal assist bike, which uses the motor to increase the power created when you pedal. So it rides and turns just like a regular bike, it just makes riding easier, especially uphill.

+ What is Espin made of?

Espin pedal-assist eBikes are made from 6061 aerospace grade aluminum alloy.

+ Can I ride my Espin pedal-assist eBike in the rain?

Yes, we have waterproofed all the wiring and electrical connections so it can withstand rain. Of course, one should not let the bike just completely soak in the rain if possible, but there is no need to worry about riding in rain.

+ Can I assemble it myself?

Yes! The assembly takes less than 15 minutes and we even provide all the tools you need. If you run into any issues, you can follow along in the assembly video.

+ What maintenance is required?

Maintenance is exactly the same as a regular bike other than the four main electrical components: battery, motor, controller, display. You should do basic tune-ups on your bike after the first 100 miles. Regular tire pressure checking is important as you want to keep your tires inflated for maximum riding comfort. 

Other than that, the electrical components should require minimal maintenance and if any issues arise, please follow the instructions to diagnose the issue, which will be included in the user manual. If you are still unable to fix the problem, please submit a warranty claim and we will process your claim as soon as we can as we understand you want to get back on the road as quickly as possible.

Customer Reviews

Customer Reviews

Based on 103 reviews
Alice Bloswick
Got off to a rocky start

The bike arrived with a broken bracket for the speedometer display and loose spokes on the tires. We hired a bike repair person to adjust the spokes properly so the bike would be safe to ride. My son enjoys riding the bike and we are glad he did not get hurt when he rode the bike with loose spokes.


I've had my sport for almost a year now and really enjoy it. This is not my first e bike so I have something to compare it to. This is a far superior bike than the first one I bought. More power to get up hills, better balanced, better brakes, smoother ride and much better controls. If asked how it could be improved all I could say was equip it with a better seat. I just don't think you could get a better bike at this price point.

Peggy Krohn
The 💣 Bomb

Love my new bike. It’s the beat thing ever assembly was a piece of cake. It’s a beautiful piece of machinery. While I had a little trouble getting my bike at the time promised.... I believe that was circumstance rather than a lack of customer service. I believe that has been fixed.

James Helmbold
Excellent Bike for the Price

Bought the Flow and have over 500 miles on it. No problems, just keeps going. I liked it so well I followed this by buying the step-thru version, the Flow. Just as good and easier to get on and off. I am completely satisfied with both of my Espin bikes.

marty stenzler
Great Bike

Love my eBike. The only issue is the back brake. The brake is weak and I have to pump the brake handle. I was told I need to take it to a bike store and have the brakes bled. Our friends also bought a sport and a flow and we also have a flow and all 4 bikes have the same breaking issue. The breaks still work I just wish they were a little stronger.

Ready to take your Sport for a spin?

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