Integrated Lighting & Signals
High and low beam headlight with turn signals and a horn improves visibility and awareness in traffic, day or night.
Kepler 52V Electric Fat Tire Ebike
Kepler 52V Electric Fat Tire Ebike
The fat-tire e-bike riders rate 4.9 stars, now rebuilt for 2026.
The Kepler 2026 keeps what riders loved, power, comfort, and value, and upgrades the rest: a bright color display with app and OTA updates, 203mm hydraulic disc brakes, an 8-speed drivetrain, torque and cadence assist, Apple Find My, and a very loud horn. Offered in High-Step and Step-Through frames, in an accessible 24-inch size.
Financing options
Estimated monthly payment
$62.45/mo Estimated over 24 months
Based on current bike price $1,499 before tax, shipping, accessories, and fees.
Estimate only. Final terms and disclosures are shown at checkout.
Payment assumptions
- Estimated monthly = bike price divided by selected months (0% APR assumption).
- Tax, shipping, accessories, and fees are not included in this estimate.
- Approval, APR, and final payment options are determined by the provider at checkout.
Included in Delivery
- E-bike
- MIK compatible Rear Rack
- Fender Kit
- E-bike Charger
- Tools
- Touch Up Paint
Check Your State E-bike Laws
Quick legal lookup
Rules for license, registration, helmet, and where you can ride vary by state and city.
Opens your selected state's current e-bike law page.
Buy it with
Kepler 52V Electric Fat Tire Ebike
Sale price
$1,499.00
Regular price$2,099.00
You save $600.00 (28% off)
52V
~1,040Wh battery
75mi
up to, per charge
750W
high-torque motor
4.9★
595 rider reviews
At a glance
The Kepler 2026 is a 24-inch fat-tire electric bike with a 750W high-torque motor, a 52V ~1,040Wh battery, up to 75 miles of range, 203mm hydraulic disc brakes front and rear, and Apple Find My. It reserves at $1,599 (MSRP $2,099) and ships mid-to-late July 2026, built by Ariel Rider, a US company operating since 2014.
The 52-volt difference
A bigger battery, and the voltage to use it.
Most fat-tire e-bikes near $2,000 run a 48-volt battery around 700Wh. The Kepler 2026 runs a 52-volt pack of roughly 1,040Wh, so you get quicker response off the line, stronger pull on hills, and more honest range before you reach for the charger.
Quicker acceleration
Higher voltage delivers power faster, so the bike feels eager from a stop, not sluggish.
Stronger on hills
More voltage means the motor holds power under load instead of sagging on steep climbs.
Up to 75 miles
The larger pack stretches real-world range, so big rides and errands don't end early.
More torque. Quicker acceleration.
1000W→750W
Watts aren't everything. We re-tuned the Kepler's motor for more usable torque and quicker acceleration than the old 1000W unit, paired with the 52V pack for stronger response and better efficiency. You feel the pull, not the spec sheet.
Torque sensor + cadence sensor
Two ways to ride. One switch.
The Kepler 2026 has two pedal-assist sensors, a torque sensor and a cadence sensor, and lets you switch between them whenever you like. The easiest way to picture the difference is a gas pedal versus cruise control.
Torque mode
Like a gas pedal.
A torque sensor measures how hard you push the pedals and tells the motor to match. Push harder and the power surges with you; soften your stroke and it eases right off.
It feels less like a motor and more like strong legs, and since the motor only works when you do, you stretch the most miles out of the 52V battery. Real ride a steep driveway, or a workout where you want the bike to reward effort.
Best for workouts, hills, control, max range
Hover or tap to rev it
Cadence mode
Like cruise control.
A cadence sensor just senses that the pedals are turning, then delivers a steady level of power you choose. Spin lightly or firmly, the push stays the same.
Pick your assist level, start pedaling, and let the bike carry the load, no real effort required. Real ride a relaxed commute in normal clothes, or long flat stretches where you would rather cruise than work.
Best for easy commutes, flat cruising, effortless miles
Hover or tap to set it
Flip between modes right from the handlebar display, no tools and no menu marathon. One bike that can feel like a gym session or a lazy cruise, your choice, every ride.
Then vs now
The Kepler riders loved, leveled up.
Same legend, hundreds of 5-star rides. Here is everything we upgraded for 2026.
Upgrade
Previous Kepler
Kepler 2026
Power delivery
1000W
→
750W, more torque and quicker acceleration
Display
Basic LCD
→
Bright color display + app + OTA updates
Pedal assist
Cadence only
→
Torque + cadence, switchable
Brakes
180mm rotors
→
203mm hydraulic, front and rear
Drivetrain
7-speed
→
8-speed
Security
None
→
Apple Find My built in
Be heard
Standard bell
→
Very loud horn
Fit
One large size
→
Agile 24-inch, High-Step + Step-Through
Launch price
$1,899
→
$1,699 (MSRP $2,099)
How it stacks up
More bike, for $400 less.
The popular fat-tire e-bikes all land at $1,999. The Kepler 2026 reserves at $1,599 and brings more battery, more voltage, and bigger brakes to the fight.
| Kepler 2026 | Aventon Aventure 3 | Himiway D5 2.0 | Velotric Nomad 2 | |
|---|---|---|---|---|
| Reserve / price | $1,699 | $1,999 | $1,999 | $1,999 |
| Battery | 52V, ~1,040Wh | 36V, 733Wh | 48V, 720Wh | 48V, 705Wh |
| Range (claimed) | up to 75 mi | up to 60 mi | up to 80 mi | up to 55 mi |
| Brakes | 203mm front + rear | 180mm | 180mm | 203 / 180mm |
| Wheels | 24-inch (agile) | 26-inch | 26-inch | 26-inch |
| Phone tracking | Apple Find My, no fee | 4G GPS (paid yr 2+) | None | Apple Find My |
| Made by | US Based, since 2014 | Since 2017 | Since 2017 | Since 2021 |
Competitor specs from public 2025-2026 listings. This highlights where the Kepler leads; rivals lead in some areas too (longer standard warranties, dealer test rides, higher max payload).
24"
Right-sized on purpose
24-inch wheels, more control.
While the field defaults to 26-inch wheels, the Kepler 2026 rides on 24s. Smaller wheels mean a lower center of gravity, quicker handling, and a stand-over height that fits a wider range of riders, without giving up fat-tire grip.
1
Nimble in the city
Quicker steering and easier low-speed balance for traffic, paths, and tight turns.
2
Fits more riders
Lower stand-over makes the Kepler approachable for shorter riders, especially in Step-Through.
3
Planted and stable
A lower center of gravity with 4-inch fat tires keeps you confident on sand, gravel, and snow.
Color display
App + OTA
Find My built in
Cockpit / app photo
Smart, without the bill
Connected tech. No monthly fee.
The Kepler 2026 gets a bright color display, a companion app, over-the-air updates, and Apple Find My. The smart features that matter, none of the subscriptions, unlike rivals that lock GPS tracking behind a paid plan after year one.
$0 subscription, ever
Bright color display · readable in direct sun
Companion app + OTA · new features over time
Apple Find My · track from your iPhone, free
Built to last
A bike, and a company, that will be here.
Ariel Rider has built electric bikes in the USA since 2014. The Kepler is one of our most-ridden, most-reviewed models, backed by US-based customer service, a US warehouse with parts on the shelf, and a 1-year warranty. While other brands come and go, the Kepler you reserve today keeps rolling for years.
2014founded
US-basedcustomer service
US warehouseparts on the shelf
1-yearwarranty coverage
UL 2271 cellsUL 2849 in testing
Dialed-in details
Why the Kepler 52V feels different
Every component below is tuned for real-world speed, control, and range; not just spec sheet flex.
Adjustable Stem
The adjustable stem lets you dial in handlebar height and reach for a more comfortable, controlled ride, whether you’re commuting or riding longer distances.
4-Piston Hydraulic Brakes
Powerful 4-piston hydraulic braking with 203 mm rotors delivers strong, predictable stopping control in all conditions.
Ergonomic Grips
Comfort-shaped grips reduce hand fatigue and improve control over rough or uneven roads.
Large Full-Color Display
A large, easy-to-read display shows speed, assist level, and ride data at a glance.
MIK-HD Rear Rack
Heavy-duty rear rack with MIK-HD compatibility supports secure cargo mounting for commuting and everyday hauling.
Battery Safety
Our advanced battery uses high-grade lithium cells with thermal-resistant tech, encapsulating each cell in heat-absorbing resin for greater safety, efficiency, and lifespan.
Tires
Wide 24" x 4.0" puncture-resistant tires improve grip, stability, and shock absorption, making the Kepler easy to control and comfortable across varied terrain.
Range
A single 52V battery tuned for real urban range, with clean frame integration and no external mounts.
Front Air Fork
An air-sprung front fork with 100mm of travel keeps the front end stable and controlled, smoothing out potholes and rough pavement.
Frame
The hydroformed frame offers superior strength, better aerodynamics, and optimized weight distribution while keeping reinforced welds for durability.
Apple Find My
Apple Find My™ integration lets you track Kepler Dual directly from your iPhone, adding an extra layer of security and peace of mind wherever you ride.
Why the Kepler rides different
Built for real-world riding
The Kepler is engineered for real-world riding, not just specs on paper. These videos show how its torque and cadence pedal assist, thermal-protected 52V battery, and ride control perform across daily commutes and mixed terrain.
Sensor System
Torque and Cadence Assist
Two assist modes in one bike. Torque delivers power that responds instantly to how hard you pedal for a natural, controlled ride, while cadence provides smooth, steady assist for easy cruising and longer distances with less effort.
Choose a feature to explore.
Explore further.
Features
- 1
- 2
- 3
- 4
- 5
- 6
Link copied
Find your fit
See it at your height
Real riders on the Kepler 52V.
Filter by height range to visualize standover and reach.
Tech Specs & Details
Explore technical specs, geometry, sizing, assembly, and downloads for Kepler 52V Electric Fat Tire Ebike.
Technical Specifications
More specs below
| Spec | Value |
|---|---|
| Motor | 52V 750W rear hub |
| Controller | Sine-wave, 33A |
| Battery | 52V single, 21700 cells, UL 2271 pack |
| Sensor | Torque + Cadence (switchable) |
| Top speed | 20 mph (Class 2), 28 mph capable where legal |
| Brakes | Hydraulic disc, 203mm rotors front + rear |
| Drivetrain | Shimano Altus 8-speed, 11-32T |
| Fork | Air suspension, 100mm travel |
| Seatpost | Suspension seatpost |
| Tires | 24" x 4.0", puncture-resistant |
| Display | Color LCD, OTA updates, Bluetooth, USB-C |
| Lighting | 200-lux headlight with horn, brake light + turn signals |
| Tracking | Apple Find My built in |
| Rack | MIK-HD compatible rear rack |
| Throttle | Half twist |
| Certification | UL 2849 + UL 2271 |
Specs may vary by batch and by selected build. Always follow local regulations.
Technical Specifications
Technical Specifications
More specs below
| Spec | Value |
|---|---|
| Motor | 52V 750W rear hub |
| Controller | Sine-wave, 33A |
| Battery | 52V single, 21700 cells, UL 2271 pack |
| Sensor | Torque + Cadence (switchable) |
| Top speed | 20 mph (Class 2), 28 mph capable where legal |
| Brakes | Hydraulic disc, 203mm rotors front + rear |
| Drivetrain | Shimano Altus 8-speed, 11-32T |
| Fork | Air suspension, 100mm travel |
| Seatpost | Suspension seatpost |
| Tires | 24" x 4.0", puncture-resistant |
| Display | Color LCD, OTA updates, Bluetooth, USB-C |
| Lighting | 200-lux headlight with horn, brake light + turn signals |
| Tracking | Apple Find My built in |
| Rack | MIK-HD compatible rear rack |
| Throttle | Half twist |
| Certification | UL 2849 + UL 2271 |
Specs may vary by batch and by selected build. Always follow local regulations.
Geometry
Geometry
| Reach | 420 mm |
|---|---|
| Top Tube Length | 22" |
| Min Seat Height | 32" |
| Max Seat Height | 39" |
| Wheel Size | 24x4" |
| Wheelbase | 45" |
| Standover Height | 27.5" |
| Stack | 26.5" |
| Effective Top Tube Length | 21" |
| Head Tube Angle | 8" |
Geometry values are manufacturer-reported and typically measured in millimeters unless noted.
Assembly
Assembly
52V
20Ah (20+0)
Max 28 mph
Range Calculator
Estimate range for Kepler Dual Battery. Adjust speed (capped at 28 mph) and riding style. Add a competitor to compare.
Riding style
Pedal Assist
Estimates vary by rider weight, wind, temperature, tire pressure, terrain, and assist level. Speed capped at 28 mph.
FAQ
Get clear answers on street legality, speed classes, shipping timelines,
and what to expect before checkout.
Is Kepler street legal?
Kepler ships as a Class 2 e-bike (20 mph), which is street-legal in many U.S. areas. You can enable Class-3 assist mode where local law allows. Always check your state and city rules before riding.
How is this different from the Kepler Dual Battery?
Same frame platform, brakes, color display, app, and Apple Find My. The Kepler runs a single 52V battery, so it is lighter and more affordable, while the Kepler Dual Battery adds a second battery for maximum range.
What speed modes does it have?
Out of the box, Kepler is configured for Class 2 behavior. Depending on settings and local rules, pedal-assist can be set higher (up to 28 mph where legal). Ride settings must match local law.
How long does shipping take?
This is a pre-order. Bikes ship in the order reserved, and you'll receive an email confirming your ship window. Once in stock, orders typically ship in 1-5 business days.
What is the return policy?
Returns are policy-based and must meet eligibility requirements. Bikes generally need to be unused and in original packaging, and fees may apply. Review the refund policy before ordering.
How much assembly is required?
Kepler arrives partially assembled. Most riders complete setup by attaching remaining components and performing a safety check before first ride. Use the assembly video on this page if needed.
What range can I expect?
Typical range is about 50-65 miles, depending on speed, assist level, rider weight, terrain, temperature, and tire pressure.
Mon to Fri, 9am to 5:00pm PTAverage answer time: 2h
California residents see Prop 65 WARNINGS
Make your Kepler truly yours
Compatible Accessories
Front Rack
Regular price$79.00
Cargo Basket
Sale price$69.00
Regular price$89.00
Bundle and Save!
Trailer Bundle
Sale price$499.00
Regular price$748.00
Front Basket
Sale price$29.00
Regular price$69.00
Overall rating: 4.872697 / 5 from 597 reviews.
AI Generated Review Summary
The Kepler 52V Electric Fat Tire Ebike offers a powerful and stable ride with a robust 1000W motor and a 52V 20Ah battery, ensuring long-distance travel. Customers praise its amazing speed, great appearance, and top-notch quality. The bike is also highly recommended for its excellent value and performance.
Summary topics
- Ride Comfort and Stability: 9%
- Overall Ebike Performance: 8%
- Product Appearance: 5%
- Bike Speed: 4%
- Product Price: 5%
Review topics: ["size","quality","looks","problem","shipping","packaging","speed","value","power","assembly","customer service","price","work","settings","bike","kepler","ride","ebike","50 miles","battery","tires","handling","experience","rack","bang","hills","seat","commuter","display","use"].
Review highlights
- "Great power, great battery, great tires, great accessories Best bike ever" —
- "The kepler is a hefty capable strong and fast bike" —
- "Awesome, I love it, Ariel made a great bike and it has a great look and feel." —
Reviews
Great bike! Battery last really
"Great bike! Battery last really long and it's pretty fast. Would definitely recommend because it has a great price too!"
Bob
"These are our third set of ebikes and by far the best. Assembly was easy and the power output and handling is great. Super happy with this purchase"
Hell ya
"This is my 3rd kepler high step. LOVE THIS BIKE!!!!"
Great build, big and fast!!
"My 2nd Electric bike. This would not be my second bike if i purchased a Ariel Rider Kepler 1st. And customer support is just what it says, they support their customers!!!! From Rhode Island so this is bike let's me ride city to city!!!!! Love my damm bike!!!!"
Best E-Bike made hands down!
"I have 3 e Bikes. Two of them are the Kepler. I have ridden many different brands of e bikes. The Ariel Kepler is hands down the best bike I have ever owned. It has the exact same 1000W Bafang motor that many brands have for a third of the cost! I'll never own anything but a Kepler."
Very Satisfied
"I've had it for two weeks and have put around 80 miles on it with very few issues. I did have a couple questions and they were quick to get me answers that resolved them. The quality the of the bike is very solid and well-built. I do notice a big difference between the 2nd and 3rd pedal assist levels that could use some balancing and since I'm on Arizona there are not a lot of hills to test but overall I am very pleased and even convinced my neighbor to get one too!"
!!!
"Only two rides in, but we are very happy with our new E Bikes!"
Love the bike. Derailer needed
"Love the bike. Derailer needed adjusted and a bit difficult to get the warranty but other than that this thing is amazing"
Love it so far!
"So far I like everything about the Kepler. . . I got it for work commute in winter a it does fine everyday. . . . I cant wait for summertime fun with ot too!"
Kepler
"My first ebike so grains of salt. First impression is the weight seems stout, but I am certain it's necessary. Assembly was very easy and everything was right there. After riding some the handling is very good! Surprisingly nimble for the weight. The gear shifts and brakes function perfectly right out of the box. After only one wipeout the derailer protector and plastic fenders seem to be well placed. The cost of this bike, excellent packaging, great battery and super responsive customer service made this a very positive experience! Thanks"
Q&A
- Hi what is the weight and the dimensions of the package in which the bike comes packed? It is to know if I can take an airplane fly with it
- Hello, The Kepler bike box dimensions are: 61x12x36in 111lbs. For your second question, you can check directly from this article (https://arielrider.gorgias.help/en-US/can-you-take-an-electric-bike-on-a-plane-801335), Thanks!
- Okay I have two questions first being what is the max top speed of this bike? second would be what is the max distance on a single charge that you can expect from this bike?
- Hello, The top speed of our bikes is 28 mph+. Changing the speed limiter is at the rider's own risk. Please check your local ebike laws/regulations to make sure you’re not breaking any laws. Range depends on many factors including riders weight, how many starts and stops, how many hills, level of pedal assist etc.
- How tall do you need to be to ride this bike?
- Hello, To determine which is a better fit for you (low-step vs high-step), please note, comfortability riding also depends on the rider's experience with ebikes so while we can make our recommendations, it can be also more of a personal preference. The high-step Kepler is high so for most riders, we recommend the low-step as the seat height can be adjusted. Here are the different measurements you can use to compare to your inseam length/height in order to help you determine if either would be a good fit for you. MINIMUM SADDLE HEIGHT (Measured from the ground to the top of the saddle) HIGH-STEP 34" LOW-STEP 32" MAX SADDLE HEIGHT (Measured from the ground to the top of the saddle) HIGH-STEP 43" LOW-STEP 42" STANDOVER HEIGHT HIGH-STEP 31" LOW-STEP 26.5" REACH HIGH-STEP 18" LOW-STEP 18" HANDLEBAR HEIGHT HIGH-STEP 44" LOW-STEP 44"
- What's the weight of the Kepler?
- 73 lb
- Will you ship this bike to Canada, or are Canadians only limited to local bikes that adhere to Canadian limits of 500 watts and max 32 km/hr speed?
- Good question! We only ship our bikes within the Lower 48 states.