QR-E PRO-320W +H70-300wh E-Bike Kit
399$
Smart Power & Hybrid Control
Motor Output: 320W Continuous Power (Reliable, high-efficiency output).
Assisted speed: The motor supports assistance up to 28 mph (45 km/h) in testing. Actual speed varies, and local limits apply.
Hybrid clutch system: Electronic and mechanical clutch — standard on every QR-E motor.
Mechanical clutch: Rotate the separation knob and the motor lifts clear of the tire — ride unassisted with no drag.
Rotation: Two-way rotation for flexible mounting options.
Cycling Modes: * ECO: Maximum energy efficiency for long rides.
Sports: Strongest assistance, for climbs and headwinds.
Regenerative Braking: Up to 200W active power recovery during deceleration.
H70 High-Performance Battery
Energy: 300Wh
Weight: 1.5kg (Lightweight and portable)
Dimensions: 73 x 230mm
Estimated Range: Up to 72km (Assisted riding).
Note: Data reflects real-world average values based on customer feedback.
Compatibility & Installation
Suitable Bikes: Road bikes, City bikes, Folding bikes, and Off-road bikes (with road tires).
Ultra-Compact Design: Requires a tiny installation space of only 6 x 4cm.
Expert Support: Some bikes may require DIY adjustments. We recommend sending a photo of your bicycle to us for compatibility confirmation before purchase.
Shipping & Checkout
Hassle-Free Delivery: DDP (Delivered Duty Paid) shipping supported in most regions. Minor customs duties may apply in certain regions.
Shipping Time: Estimated 12–18 days.
How to Order: Add to cart and proceed to the checkout page. Please enter your country in the shopping cart to confirm specific shipping availability.
Power when you want it. A natural ride when you don’t.
A compact 320W friction-drive system with electronic and mechanical clutch control, low-noise operation, two-way rotation and active regenerative braking. Built light. The QR-E PRO covers the same assisted-speed range in a leaner setup — tuned for road and city bikes where low weight matters most.
Electronic clutch
Smooth engagement synced to tire speed.
Mechanical separation
Fully disengage the motor for an unassisted ride.
Energy recovery
Up to 200W regenerative braking.
Compact system. Long-range support.
Continuous motor output
H70 battery energy
Estimated assisted range
Motor supports up to, in testing · local limits apply
Fast electronic response. Complete mechanical separation.
The electronic clutch synchronizes the motor with tire speed for a smooth start and stable contact. When assistance is not needed, the adjustment knob can physically separate the motor from the tire and restore an unassisted bicycle feel.
Electronic clutch
Quick entry into the operating state with electronically managed resistance.
Mechanical clutch
Rotate the separation knob to move the motor fully away from the tire.
More freedom to find the right mounting position.
The motor supports both rotation directions and automatically adapts to tire rotation, making it easier to work around different bicycle frame geometries.
Forward or reverse orientation
Flexible positioning without changing the core drive system.
Only 6 × 4cm required
Designed for compact spaces around the rear wheel.
Everything needed for the conversion.
The 33V H70 bottle battery stores 300Wh while keeping a compact 73 × 230mm profile.
QR-E PRO friction-drive system
H70 33V 9Ah / 300Wh battery
37V 2A charger
S-2 control switch
Installation tool
Friction stickers ×2
Control assistance and energy recovery without changing your grip.
The compact S-2 remote controls the throttle trigger and regenerative braking while riding. Its cable can be routed alongside the brake line for a clean installation.
Up to 200W recovery
Active power recovery during deceleration.
ECO / Sports modes
Choose efficiency for longer rides or stronger performance.
Check the bike. Keep the setup simple.
Suitable for road, city and folding bikes, plus off-road bikes used with road-friendly tires.
Bike compatibility
Road, city, folding and suitable off-road bicycles.
Installation space
Allow at least 6 × 4cm near the rear tire.
Continuous tread
The tire contact surface should have a continuous tread pattern.
Confirm before purchase
Some bicycles need DIY adjustment. Send us a photo for compatibility confirmation.
PRO or PRO-MAX?
Same assisted-speed range, same H70 battery, same hybrid clutch. The difference is power and fit: PRO is the lightest, most hidden build for road bikes; PRO-MAX is the all-rounder that pulls harder on climbs and fits more places on the frame.
Power & performance
- Continuous power The output the motor sustains, not a short peak.
- 320W
- 400W +80 W
- Regenerative braking Active energy recovery during deceleration.
- 200W
- 240W +40 W
- Climbing
- Flat to rolling routes
- Stronger on steep, sustained climbs
- Assisted speed Motor supports up to 28 mph in testing, with pedalling assistance. Ride within local limits.
- 45km/h
- 45km/h
- Riding modes
- ECO / Sports
- ECO / Sports
- Clutch
- Electronic + mechanical
- Electronic + mechanical
- Rotation
- Two-way
- Two-way
Fit & installation
- Best suited to Where each version performs best.
- Road bikes and light builds
- Folding, mountain and heavier bikes
- Compatible bikes Both versions fit all of these.
- Road, city, folding, off-road on road tyres
- Road, city, folding, off-road on road tyres
- Motor weight Drive unit only, battery not included.
- 520g
- 620g
- Installation space required Clear area needed near the rear tyre.
- 6 × 4cm
- 7 × 5cm
- Mounting positions PRO-MAX needs slightly more room but accepts more places on the frame.
- Smallest footprint — fits the most hidden spots
- Bottom-mounted or inverted — more positions
- Mounting
- 2 × M5 anti-rust screws
- 2 × M5 anti-rust screws
- First install time
- 5–10 min
- 5–10 min
Battery & range — H70 kit
- Battery energy
- 300Wh
- 300Wh
- Estimated range Assisted riding, customer-feedback average.
- 72km
- 72km
- Battery weight
- 1.5kg
- 1.5kg
- Battery size
- 73 × 230mm
- 73 × 230mm
- Charger
- 37 V 2 A
- 37 V 2 A
Consumables
- Friction layer refill The two versions take different friction layers — order the one that matches.
- QR-E MUTE / PRO · 10 pcs
- QR-E PRO-MAX · 6 pcs
- In the box
- Drive, H70, charger, S-2 switch, tool, 2 friction layers
- Drive, H70, charger, S-2 switch, tool, 2 friction layers
- M-Flex240WDIY setups, bring your own 36 V battery
- MUTE250WTypical city commuting
- PRO320WRoad and city bikes, flat to rolling routes
- PRO-MAX400WSteeper routes, heavier bikes, longer trips
MUTE and M-Flex are shown for family context and are not part of this comparison. M-Flex has no regenerative braking; every other version does.
Assisted-speed figures describe motor capability measured under test conditions with pedalling assistance — not a target speed, and not a promise of real-world performance. Range figures are real-world averages reported by customers; actual results vary with rider weight, tyre type, gradient, wind and battery condition. Many regions cap assisted speed on public roads — always ride within the limits that apply where you are. Power figures are continuous output, not peak.
Installation and riding overview.
QR-E PRO overview
International delivery
Estimated delivery is 12–18 days. DDP shipping is supported in most regions; minor customs duties may still apply in certain locations. Enter your country in the cart to confirm availability.
Compatibility support
Send a bicycle photo before ordering if the available mounting space is unclear. Accessories are also available separately. Email qiroll@qiroll.com.
Need the complete setup instructions?
Download the full QR-E MUTE / PRO manual, or contact us for compatibility help before ordering.
