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It depends on the riding mode. ECO mode is pedal-assist and requires you to pedal, while Sports mode can support electric-only riding under certain conditions. Moderate pedaling improves efficiency, extends range and keeps the ride feeling natural.

QIROLL uses a replaceable polymer friction layer designed to avoid excessive tire wear. Keep it clean, correctly aligned and replace it when visibly worn.

Avoid: Do not substitute sandpaper or other abrasive surfaces; they can shorten tire life substantially.

The assist device is splash-resistant, but we do not recommend riding in moderate or heavy rain. Rain reduces traction, efficiency and range. If the system becomes wet, dry it thoroughly before the next ride and store it in a dry environment.

A smooth center tread—such as a slick road tire—delivers the quietest and most efficient performance. Grooved or lightly knobby tires may work, but can increase noise and reduce range. Off-road tires are generally less suitable.

During coasting, regenerative braking adds resistance to help slow the bike and converts some kinetic energy back into battery power. It is activated from the round button, and the recovery output depends on the version—up to 240W on the QR-E PRO-MAX, 200W on the QR-E PRO, and 100W on the QR-E MUTE; the QR-E M-Flex does not include regenerative braking.

Safety: Regenerative braking supplements the bicycle's mechanical brakes; it is not a replacement for them.

Installation requires minimal changes to the bicycle: there is no need to replace a wheel or alter the drivetrain. When assistance is inactive, the bike retains much of its original riding character—useful for touring, fitness riding and anyone who values low weight.

The motor can remain in light contact with the tire while the bike is pushed or ridden without assistance. When activated, motor output synchronizes with tire speed. This simplifies installation and avoids repeated mechanical engagement and separation.

QIROLL motors are designed specifically for bicycle friction drive, where usable traction and efficiency matter more than oversized peak-power claims. The compact structure and purpose-built materials keep weight low while maintaining stable continuous output.

No special tools are required. The surface-mount friction layer can be replaced in about five minutes, and spare layers are compact enough to carry on a ride.

QIROLL ratings refer to continuous power—the output the motor can sustain—rather than a short peak value. The QR-E MUTE version suits typical city commuting; the QR-E PRO and QR-E PRO-MAX versions are better for steeper routes, enthusiastic riders and longer trips; the QR-E M-Flex version is designed for greater battery flexibility, including support for third-party batteries.

For a precise recommendation: Send your bicycle model, tire size, rider weight, typical gradient and desired range.

The QIROLL QR-E is a friction-drive bicycle assist system that mounts onto a bicycle and helps reduce pedaling effort while preserving the original riding feel. It supports free riding, pedal-assisted riding, and electric-only riding under certain conditions. It is suitable for commuting, bike touring, fitness riding, and everyday easier riding.

The QIROLL QR-E is mainly designed to make riding easier, not simply to pursue a higher top speed. It helps riders maintain a steady riding speed with less effort, reducing physical fatigue.

A regular electric bike is more focused on electric-only transportation. The QIROLL QR-E is designed to preserve the original bicycle riding experience. It is compact and lightweight, does not significantly change the bicycle's appearance or riding habits, provides assistance when needed, and still allows normal riding when assistance is not in use.

The QIROLL QR-E is suitable for commuting, bike touring, fitness riding, everyday easier riding, and riders who want to keep the feel of riding a bicycle. Road bikes, folding bikes, touring bikes, and some mountain bikes can be evaluated for installation based on frame conditions.

Yes. ECO mode requires the rider to pedal, and the motor assists to reduce effort rather than fully replacing pedaling. Riders can switch between free riding, pedal-assisted riding, and electric-only riding according to their physical condition.

It is suitable for certain bike touring and long-distance assist riding needs. Riders can configure batteries according to the trip distance. Even if the battery runs low, the bicycle can still be ridden like a regular bicycle.

In general, it can be installed on road bikes, folding bikes, and some mountain bikes, but the frame structure, rear wheel position, and available installation space need to be checked. Before ordering or installing, it is recommended to send bicycle photos to customer service for confirmation.

Different bicycles vary greatly in rear fork structure, tires, brakes, fenders, and available installation space. The model name alone may not be enough for an accurate judgment. Photos help customer service confirm whether the bicycle is suitable for installation.

Normal installation and removal generally do not damage the bicycle. Please follow the user manual and installation video, and take care to protect the friction drive, battery, and frame surface during installation.

Yes. The QIROLL QR-E is relatively convenient to install and adjust. After reading the manual, watching the installation video, and following the adjustment instructions, most users can complete installation by themselves. Before installation, please confirm the installation position and tire condition.

Some mountain bikes can use it. However, if the rear tire has an obvious knobby tread, it is usually recommended to replace the rear tire with one that is more suitable for friction assist before use.

The square button is the assist activation button. When riding, press and hold the square button to activate motor assistance; release the button to turn assistance off.

The round button is mainly used for mode switching and regenerative braking. Please follow the instructions provided with the product for the exact operation.

ECO mode is a pedal-assist riding mode that requires the rider to pedal. The motor automatically provides assistance according to the riding condition, helping reduce effort and providing relatively longer range.

Sports mode provides stronger assistance and can support electric-only riding under certain conditions. Actual speed and range are affected by bicycle type, rider weight, tires, road conditions, wind direction, and battery status.

It is not recommended. Regenerative braking is only an auxiliary deceleration and energy recovery function. It cannot replace the bicycle's mechanical brakes. When stopping is required, please rely on the bicycle's original brakes.

In ECO mode, the rider still needs to pedal, and the QIROLL QR-E can noticeably reduce riding effort. The actual assistance effect varies with bicycle type, road conditions, tire pressure, and riding style.

Electric-only riding speed is affected by bicycle type, rider weight, road conditions, wind direction, and battery status. It should generally be understood as a speed range suitable for light everyday transportation, rather than the speed expectation of a high-power electric bike.

Range is affected by rider weight, bicycle weight, bicycle type, tires, tire pressure, road conditions, slope, wind direction, riding speed, assist mode, and riding habits. Actual range depends on the specific use environment.

During charging, the charger indicator light is the main reference. It is usually normal for the battery light not to turn on. When the charger indicator changes from red to green or blue, it generally means the battery is fully charged.

No. The battery is a lithium battery and can be charged as needed. It does not need to be fully drained before charging, and it does not need to be fully charged every day.

A full charge takes about 4-5 hours. If the battery is not completely depleted, routine top-up charging usually takes about 3-4 hours. Please refer to the charger indicator light for the actual charging status.

If the battery will not be used for more than a week, adjust it to about 60%-80% charge. Avoid storing it fully charged for a long time, and also avoid storing it at low or depleted power. Check the battery level about every 3 months and recharge slightly if the level is low.

It is not recommended. Charging should be monitored, and the power should be disconnected promptly after the battery is fully charged. Avoid leaving the battery charging unattended for a long time.

Under normal conditions, there should be no obvious dragging feeling. The QIROLL QR-E uses electronic clutch control to reduce contact resistance, allowing the rider to continue riding normally.

No. Regenerative braking only recovers part of the energy back into its own battery. It cannot be used as an independent generator.

The product is splash-resistant, but it must not be submerged in water. Riding in moderate or heavy rain is not recommended, and rainy conditions may also affect friction assist performance.

After returning home, wipe the assist device dry promptly and place it in a dry environment.

No. Do not apply anti-rust, rust-removing, or lubricating liquids such as WD40 to the bearings or rotating parts, as this may affect the internal lubrication structure and damage the motor.

Clean the assist device and store it in a dry environment, avoiding long-term moisture exposure. It is recommended to start and check it every 2-3 months, and to store the lithium battery at a suitable charge level.

Yes. Some accessories can be purchased separately. Please refer to the store page or contact customer service for confirmation.

You can contact customer service for further evaluation. If necessary, the product can be returned for inspection according to the after-sales process provided by customer service.

In general, the motor is not sold separately and is usually purchased as part of a complete set. If you already have a compatible original battery, please contact customer service to confirm compatibility and purchase options.

Except for the QR-E M-Flex version, other versions currently do not support third-party batteries.