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Rated 4.8 out of 5
Based on 137 reviews
$1,869
  • commuter and LIGHT TRAIL RIDING

Inspired by San Francisco’s foggy hills, the 21 Flow is your favorite new commuting buddy. With a stylish step-through frame and enough power to zip through traffic and up hills with ease, Flow is our most crowd-pleasing e-bike to date.


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


Suggested for riders: 5’2” - 6’4” and up to 275 lbs

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

Why you'll love it:

  • Perfect for casual riders and commuters
  • Designed for versatility
  • Supports good riding posture

Ships in 1-2 Days

Estimated delivery within 7 Days

Shipping times may be impacted by FedEx delays

12 MONTH WARRANTY

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

95% ASSEMBLED

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

FREE SHIPPING (LOWER 48)

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

EXCEPTIONAL SUPPORT

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

Gives you the freedom to explore.

Features
Electronics

Motor Brand     

Espin


Motor Type 

Rear Mounted Geared Hub


Motor Nominal Output

500 watt nominal/800 peak output


Motor Torque

65 Nm

Battery Brand

Samsung Cells


Battery Voltage

48 volts


Battery Amp Hours

13.6 ah


Battery Watt Hours

653Wh


Battery Chemistry

Lithium-ion


Battery Charge Time

6 hours

Riding Range Estimated Min
30 miles

Riding Range Estimated Max
50 miles

Display Type     
Espin color LCD

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

Drive Mode     
12 magnet sealed cadence sensing pedal assist

Top Speed     
Class 2

Components

Attachment Points

Rear Rack bosses, Fender Bosses


Brakes

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


Cranks

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

Fork

100mm Travel Hydraulic Lockout


Frame Size

18"


Frame Type

Step-through


Gearing 

S-Ride 8 speed 13-32T


Hand Grips

Velo

Handlebar

Zoom Alloy Swept back Handlebar 25.4mm


Headlight

LED


Pedals

Wellgo Aluminum Alloy Platform


Rack Capacity

55 lbs (25kg) 15" x 5"

Saddle

Selle Royal Freeway


Seatpost

Zoom 30.4mm


Shifter

S-Ride triggers


Tires

CST 27.5 x 2.10


Weight

55 lbs


Other

Locking Removable Battery Pack & Fenders

Size Guide

FAQ

+ 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.

+ How will the Flow's tire do in snow or a beach environment?

The Flow is meant for pavement and will not handle snow. For snow, try the Nesta or Nero.

+ 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

average rating 4.8 out of 5
Based on 137 reviews
  • 5 Stars
    114 Reviews
  • 4 Stars
    19 Reviews
  • 3 Stars
    1 Review
  • 2 Stars
    1 Review
  • 1 Star
    2 Reviews
97% of reviewers would recommend this product to a friend
Value
Rated 4 out of 5
Ease of Use
Rated 4 out of 5
Customer photos and videos
137 Reviews
Reviewed by Judy R., from United States
Verified Buyer
I recommend this product
Rider Level
Beginner
Age Range
55 - 64
Gender
Female
Primary Use
  • Fun
  • Health
Product Standouts
  • High Quality
  • Beginner-Friendly
  • Fun
Service and Experience Standouts
  • Great Customer Support
Rated 5 out of 5
Review posted

Flow me around town

Well built and easy to use! Use it to ride the hills of Pittsburgh, and there are many just outside my door. Also great for going short distances on the main road to my favorite Farmer’s Market.

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Value
Rated 4 out of 5
Ease of Use
Rated 4 out of 5
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Reviewed by Michelle E., from United States
Verified Buyer
I don't recommend this product
Rider Level
Intermediate
Age Range
35 - 44
Gender
Female
Rated 2 out of 5
Review posted

Too powerful for an ebike

This ebike is a disappointment. Instead of the letting the rider take control of the bike, the bike seems to want to take control itself, jolting forward with a lunge powerful enough to throw the rider off the bike if not careful. The throttle will do the same thing, so is not safe to use, especially on an uphill slant. The “basket” that comes standard now with the bike was not pictured in the online photo and makes it very difficult to maneuver the bike as it stays in place while the handlebars and wheel turn. If the basket is removed, it leaves four unsightly holes in the front frame of the bike. I bought another ebike for myself and am so glad I did. It is so much easier and safer to ride. Unfortunately with the espin return policy, it isn’t worth it to return with all the fees and return shipping costs, in addition to it taking hours to assemble. The customer service never answered the phone when calling with questions either. I would not recommend this ebike and regret the purchase. Do not buy if you want to be safe on your ebike!

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Value
Rated 2 out of 5
Ease of Use
Rated 1 out of 5
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Espin Electric Bikes

Hi Michelle,

We apologize that you didn't have the best experience with your Espin bike. Please be aware that the power level of the pedal assist can be adjusted to user preferences using the directions outlined in the user manual. This means that the power level of pedal assist level 1 can be brought down to feel less powerful for riders not used to the speed or surge of power.

In the case of customer service, please be aware that our hours of operation are 9am-5pm, Monday through Friday. Calls outside of that time will not be answered. Out phone team is also very small, so we suggest calling during off-peak hours (earlier in the morning) to increase your chances of calls being answered the first time around. However, emails will always be answered within 3 business days.

Let us know if you have further questions,

Maya
Team Espin

Reviewed by Bonnie V., from United States
Verified Buyer
I recommend this product
Age Range
55 - 64
Gender
Female
Primary Use
  • Health
  • Fun
Product Standouts
  • Great Value
  • Fun
  • Beginner-Friendly
Service and Experience Standouts
  • Quick Delivery
Rated 5 out of 5
Review posted

BIKE FUN

I LOVE MY NEW BIKE. Has plenty of power and pedals nicely without power. Love the rack and kick stand. I haven't been on a bike in 20 years to a couple of rides to feel comfortable but now i am always ready to go for a ride.

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Value
Rated 5 out of 5
Ease of Use
Rated 4 out of 5
Was this helpful?
Reviewed by Gloria P., from United States
Verified Buyer
I recommend this product
Rider Level
Experienced
Age Range
55 - 64
Primary Use
  • Fun
  • Health
Product Standouts
  • Comfortable to Ride
  • Fun
  • Durable
  • High Quality
Service and Experience Standouts
  • Great Customer Support
  • Quick Delivery
  • Securely Packaged
  • Easy to Assemble
Rated 5 out of 5
Review posted

Love espin bikes

My husband and I love our bikes. Espin has great customer support. Totally happy with the bikes and support.

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Value
Rated 5 out of 5
Ease of Use
Rated 5 out of 5
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Reviewed by Daryl N., from United States
Verified Buyer
I recommend this product
Rider Level
Experienced
Age Range
65+
Primary Use
  • Fun
Product Standouts
  • Comfortable to Ride
  • Great Value
  • Stylish
  • Fun
  • Attracts Compliments
Service and Experience Standouts
  • Quick Delivery
  • Securely Packaged
  • Easy to Assemble
  • Great Customer Support
Rated 5 out of 5
Review posted

Espin Flow review

The bikes arrived 10 days after we ordered them, very well packaged and very easy to assemble, no problems whatsoever, they look absolutely beautiful. We rode both of them 3/15/22 for 16 miles and the batteries were still at 100% when we got home. Were very happy we went with bikes that had hydraulic brakes as the bikes are much heavier than our nonelectric ones. The peddle assist makes climbing hills and going against the wind a breeze. I could not even hear the motor while riding . so far so good. Thanks Daryl & Karen

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Value
Rated 4 out of 5
Ease of Use
Rated 5 out of 5
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