Ariel Rider Kepler
The Ariel Rider Kepler is an electric bike with a 52V 20Ah (~1,040Wh) pack, a 750W nominal motor, 1040Wh (52V × 20Ah), a weight of 98.6 lb and a load capacity of 400 lb.
Last updated: 6 November 2026
Motor and performance
- Motor
- 750W nominal
- Peak power
- 1,940W peak
- Top speed
- Sources disagree
20 mph (Class 2 default); 28 mph (Class 3 configuration) where legal
“Top speed 20 mph (Class 2 default); 28 mph (Class 3 configuration) where legal”
Source: arielrider.com/products/kepler
20 MPH (Class 2) 28 MPH (Class 3) where legal
Row from the maker’s page: “Top Speed” | “20 MPH (Class 2) 28 MPH (Class 3) where legal”
Source: arielrider.com/products/kepler
28 mph
“Adjust speed (capped at 28 mph at class 3 configuration - no throttle) and riding style.”
Source: arielrider.com/products/kepler
- Claimed range
- Sources disagree
Up to 75 mi*
Row from the maker’s page: “Range” | “Up to 75 mi*”
Source: arielrider.com/products/kepler
75 miles
“The Kepler 2026 is a 24-inch fat-tire electric bike with a 52V battery and up to 75 miles of range.”
Source: arielrider.com/products/kepler
- Payload capacity
- 400 lb
- Controller
- Sine-wave controller, 33A
- Motor specification
- 750W nominal · 1,940W peak
- What the assist responds to
- Torque and Cadence Sensor
“Motor 750W nominal, 1,940W peak (rear hub)”
Source: arielrider.com/products/kepler
“Motor 750W nominal, 1,940W peak (rear hub)”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Payload” | “400 lb”
Source: arielrider.com/products/kepler
“Controller / throttle Sine-wave controller, 33A”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Motor” | “750W nominal · 1,940W peak”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Sensors” | “Torque and Cadence Sensor”
Source: arielrider.com/products/kepler
Battery and charging
- Energy
- 1040Wh (52V × 20Ah)
- Battery
- 52V 20Ah (~1,040Wh)
- Voltage
- 52V
- Cell supplier
- Samsung 21700
- Battery specification
- 52V 20Ah (~1,040Wh), Samsung 21700, resin-potted cells, smart BMS
- Cell potting
- resin-potted cells
Row from the maker’s page: “Total capacity” | “1040Wh (52V × 20Ah)”
Source: arielrider.com/products/kepler
“Battery 52V 20Ah (~1,040Wh), Samsung 21700, resin-potted cells, smart BMS”
Source: arielrider.com/products/kepler
“The Kepler 2026 is a 24-inch fat-tire electric bike with a 52V battery and up to 75 miles of range.”
Source: arielrider.com/products/kepler
“Battery 52V 20Ah (~1,040Wh), Samsung 21700, resin-potted cells, smart BMS”
Source: arielrider.com/products/kepler
“Battery 52V 20Ah (~1,040Wh), Samsung 21700, resin-potted cells, smart BMS”
Source: arielrider.com/products/kepler
“Battery 52V 20Ah (~1,040Wh), Samsung 21700, resin-potted cells, smart BMS”
Source: arielrider.com/products/kepler
Frame and components
- Frame style
- High-Step
- Tires
- 24" x 4.0" Fat Tires
- Wheel size
- Sources disagree
24" x 4.0"
Row from the maker’s page: “Wheel Size” | “24" x 4.0"”
Source: arielrider.com/products/kepler
24-inch
“The Kepler 2026 is a 24-inch fat-tire electric bike with a 52V battery and up to 75 miles of range.”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Frame” | “High-Step”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Tires” | “24" x 4.0" Fat Tires”
Source: arielrider.com/products/kepler
Size and fit
- Rider height
- 5'1" - 5'11"
- Weight
- 98.6 lb
- Total length
- 72.3 in
- Seat angle
- 73 deg
- Standover height
- 25.7 in
- Seat tube
- 15.0 in
- Minimum saddle height
- 32 in
- Maximum saddle height
- 39.6 in
- Handlebar height
- 42.6 in
- Seat height, lowest
- 32 in
- Seat height, highest
- 39.6 in
- Head tube length
- 6.3 in
- Top tube length
- 23.4 in
- Chainstay length
- 18.5 in
- Head tube angle
- 69 deg
- Seat tube angle
- 73 deg
- Seat tube length
- 15.0 in
- Stack
- 26.3 in
Row from the maker’s page: “Rider Height Range” | “5'1" - 5'11"”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Bike Weight (Without Add-Ons)” | “98.6 lb”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Total Length” | “72.3 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Seat Tube Angle” | “73 deg”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Standover Height” | “25.7 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Seat Tube Length” | “15.0 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Minimum Seat Height” | “32 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Maximum Seat Height” | “39.6 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Handlebar Height” | “42.6 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Minimum Seat Height” | “32 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Maximum Seat Height” | “39.6 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Head Tube Length” | “6.3 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Top Tube Length” | “23.4 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Chainstay Length” | “18.5 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Head Tube Angle” | “69 deg”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Seat Tube Angle” | “73 deg”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Seat Tube Length” | “15.0 in”
Source: arielrider.com/products/kepler
Row from the maker’s page: “Stack” | “26.3 in”
Source: arielrider.com/products/kepler
Certification claims
- Battery certification claim
- UL 2849 + UL 2271
- E-bike class
- Class 2
“carries UL 2849 + UL 2271 certification.”
Source: arielrider.com/products/kepler
“Top speed 20 mph (Class 2 default); 28 mph (Class 3 configuration) where legal”
Source: arielrider.com/products/kepler
Sources
- Kepler || Fat Tire Electric Bike || Ariel Rider EbikesArchived document
Source: arielrider.com/products/kepler
Retrieved October 10, 2026