Hidden power. Open road. 01

Enjoy
Cycling!

Smallest, lightest, and powerful. Transform the bicycle you already love with a discreet friction-drive system.

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QIROLL electric bike conversion kit fitted to a bicycle
Weight
0.52kg
Size
79×66×40mm
Engineered for everyday freedom

QIROLL QR-E bike kit

Smallest & Lightest

Ultra-Lightweight Design

Motor
0.52kg
Battery
0.6-1.5kg

Motor only 1.15 lbs.

Up to 72km

Efficient Range

B70
Capacity
200Wh
Range
42–46km
H70
Capacity
300Wh
Range
72km

Customer feedback average.

Global Support

Customer Support

Global installation examples and direct support from qiroll@qiroll.com.

QR-E PRO-MAXHidden power, precision built
QIROLL QR-E PRO-MAX motor Shop Now
400W PRO-MAX

Powerful and Efficient

PRO-MAX
400W
PRO
320W
MUTE
250W

Continuous power.

Up to 240W

Regenerative Braking

Activate energy recovery whenever needed, with generation up to 240W.

1 Year

One-Year Warranty

Third-generation all-metal structure with dedicated after-sales support.

Simple installation 02

Ready to Ride in 10 Minutes

Zero Hassle

Only two screws are needed to secure the system.

Universal Fit

Fits most bikes with a smooth-tread rear tire and a flat frame mounting area.

Run the fit check

Professional Grade

M5 rust-proof hardware ensures lasting durability.

Installing a QIROLL kit on a bicycle
M5 rust-proof screw · two-screw installation
QIROLL fitted discreetly to a road bicycle
Invisible design · uncompromising performance

1.12kg Total Weight. Perfectly Balanced.

Effortless switching. Infinite range. 03

The Art of Hidden Power

Sits inside the frame triangle

Blends into the frame, preserving its pure silhouette.

Silent Velocity

Advanced technology for a whisper-quiet ride.

Pure Freedom

A discreet boost exactly when you need it.

QIROLL MUTE hidden drive system
Additional accessories 04

Seamless Separation

Mechanical clutch

Turn the knob and the roller lifts clear of the tyre — ride it as a plain bicycle.

Electronic clutch

Motor output syncs to tyre speed, so assistance starts without a jolt.

No noticeable drag when off

Electronic control cancels motor resistance while you ride unassisted.

QIROLL mounted on a Specialized Diverge bicycle
Rapid-swap system 05

10-Second Quick Release

Instant Swap

Mount or detach the motor in 10 seconds.

Zero Tools

Hassle-free setup via the Ladder Slider Bracket.

Expandable

Standalone brackets provide total flexibility.

QIROLL quick-release assembly
High performance 06

Stable Friction

All-Tread Adaptive

High-stability polymer rubber.

Surface-Mount

Cost-effective and easy to replace.

DIY-Simple

Quick installation and parts swapping.

QIROLL high-stability friction surface
Energy recovery 07

Kinetic Energy Recovery

QR-E MUTE

250W / 100W regen

QR-E PRO-MAX

400W / 240W regen

Reclaim Lost Power

Turn every descent into extra range for your battery.

QIROLL kinetic energy recovery system
Built to last 08

Industrial Grade

Standards-Driven

Every component is a specified industrial part — no unbranded substitutes.

Rugged Build

CNC high-strength alloy and industrial chips.

Proven Legacy

First-generation QR-E motors remain reliable after six years of use.

QIROLL industrial-grade motor components
Four films. One system. 09

Watch QIROLL in Action

Product overview, installation, engineering history and a complete PRO test ride.

QIROLL on a Specialized Diverge QIROLL on a Strida bicycle QIROLL rider installation QIROLL fitted to a bicycle
0104

Every bike can be an E-bike

Riders around the world have fitted the QR-E to road and mountain bikes, folding and small-wheel bikes, Strida and recumbents.

RoadMountainFoldingSmall-wheelStridaRecumbent
New

QR-E PRO-MAX

Precision power in a compact form, engineered for riders who want more assistance without changing the character of their bicycle.

New QIROLL QR-E PRO-MAX

Questions before your first ride?

Explore the friction-drive FAQ or talk with the QIROLL team about fit, installation and the right kit for your bicycle.

Explore F.A.Q Contact