QR-E M-Flex Motor Kit
182$
Power & Intelligent Control
Motor Output: 240W Continuous Power (Reliable & stable performance)
Assisted speed: The motor supports assistance up to 23 mph (37 km/h) in testing. Actual speed varies, and local limits apply.
Clutch System: Dual-Clutch Design (Features both Electronic and Manual clutch for maximum flexibility).
Intelligent Drive: Automatic speed adaptation for a seamless riding experience.
Cycling Modes: * ECO: Optimized for energy efficiency and long-distance travel.
Sports: Maximum responsiveness for a more dynamic ride.
Battery & Range (Highly Compatible)
Voltage Compatibility: Supports a wide range from 20V to 42V.
Recommended Setup: Best performance with a 36V (5Ah or higher) battery.
Estimated Range: 42km (Tested with a 36V-5Ah battery).
Note: Range scales with battery capacity—larger batteries provide longer distances.
Battery Note: If using an external Battery, an output of 300W or higher is recommended.
Connector: Requires batteries with XT60 interface.
What’s in the Box?
QIROLL QR-E Flex Friction Drive Motor
Conversion Cable: Converts motor wire interface to XT60, compatible with XT60 batteries.
S-2 Control Switch: Convenient handlebar-mounted controller.
Tool Set: All necessary tools for a quick installation.
Shipping & Checkout
Hassle-Free Delivery: DDP (Delivered Duty Paid) shipping supported in most regions.
Quick Check: Please enter your country in the shopping cart to confirm shipping availability.
How to Buy: Add the kit to your cart and proceed to the shopping cart page for payment.
Smallest and lightest
- Continuous Power
- 240W
- Supported voltage
- 20–42V
- Estimated Range · tested at 36 V 5 Ah
- 42km
- Battery interface
- XT60
Power with intelligent control
240W continuous power delivers reliable and stable performance, with automatic speed adaptation for a seamless riding experience. Choose ECO mode for energy efficiency and long-distance travel, or Sports mode for maximum responsiveness and a more dynamic ride.
240W
Continuous motor output
20–42 V
Use your own battery pack
Dual clutch
Electronic and manual control
ECO + Sports
Two cycling modes
Highly compatible with external batteries
Supports a wide voltage range from 20V to 42V. Assisted speed also scales with pack voltage: a 42 V pack extends the assistance range further than 36 V, within local limits. For the best performance, use a 36V battery rated at 5Ah or higher. A 42km estimated range was tested with a 36V 5Ah battery. Range scales with battery capacity, so larger batteries provide longer distances.
20–42V
Supported voltage range
36V · 5Ah+
Recommended setup
42km
Tested with a 36V 5Ah battery
XT60
Required battery interface
Fix the motor with two M5 anti-rust screws
The first installation and adjustment is estimated to take 5–10 minutes. The kit comes with the tools needed for quick installation and is compatible with most bicycles.
Broad bicycle support
Suitable for road, mountain, folding and small-wheel bicycles.
Automatic two-way
More installation positions help the kit integrate naturally with the bicycle.
Special bicycles
Please send us bicycle photos before ordering if you need compatibility confirmation.
The motor automatically synchronizes with tire speed
The electronic clutch uses control logic to eliminate motor resistance while the motor remains in contact with the tire, allowing it to enter the operating state quickly and steadily. When the assist system is not in use, the manual adjustment knob separates the motor from the tire so the bicycle can ride like the original bike.
Electronic clutch
Fast, stable engagement with no resistance
Manual clutch
Separates the motor when power is depleted
Built for daily riding and easy maintenance
Polymer rubber friction stickers do not damage the tire and are easy to replace. The S-2 handlebar switch keeps control close at hand.
Tire friendly
No damage to tires during normal installation and use.
Easy to replace
Serviceable friction layer and simple installation hardware.
S-2 control
Convenient handlebar-mounted controller included in the package.
Introduction
QIROLL QR-E introduction and installation
Compact hardware, flexible power
The compact M-Flex motor preserves the bicycle's original balance while adding responsive electric assistance.
Motor weight
520g.
Motor size
79 × 66 × 40mm.
Motor output
240W continuous power.
Assisted speed
Motor supports up to 23 mph (37 km/h) in testing, with pedalling assistance.
External battery
20–42V support, 300W or higher output recommended, XT60 interface required.
Reliable system
The internal controller actively cuts power in extreme conditions to help protect the system.
Everything needed to start your M-Flex project
This is a motor kit for use with a compatible external battery; a battery is not listed as part of the package.
QIROLL QR-E M-Flex
Friction drive motor.
Conversion cable
Converts the motor wire interface to XT60 for compatible batteries.
S-2 control switch
Convenient handlebar-mounted controller.
Tool set
All necessary tools for a quick installation.
Tracked international delivery
We use express delivery to reach most parts of the world. Contact us if you need to confirm delivery to your location.
Estimated delivery time
12–18 days.
DDP delivery
Delivered Duty Paid shipping is supported in most regions.
Check availability
Enter your country in the shopping cart to confirm shipping availability before payment.
US and EU customers
VAT service is available so no additional VAT payment is normally required.
Road bikes, city bikes and folding bikes
Ready to create your own project?
For special bicycles, send us photos before ordering so we can help confirm installation compatibility.
