FAQ

Choose the right model and battery capacity according to the usage (commuting, traveling, sports).

All electric bikes enjoy free shipping service. Our shipping service is only available for addresses within the continental United States, which includes 48 states.

Yes, state and local sales taxes (where applicable) will be applied to all orders shipped to the following states:
Alabama, Arizona, Arkansas, California, Colorado, Connecticut, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and Wyoming.

Orders will be processed within 48 hours on business days. Once tthe order has been shipped, a shipping confirmation email will besent to your email address. We use FedEx for transportation. Please allow 2-7 business days for the shipment to reach your specifieddlocation. Pre-order orders will have the estimated shipping date indicatedthe product page. Any delivery dates provided by QRONGE are estimated dates.

Only one coupon can be used per order, and we do not support coupon stacking. The final interpretation right belongs to QRONGE.

Please contact our customer service team. If your order hasn't shipped yet, we can cancel it. If your package has already been delivered, please ensure the item is intact and return it to us. You will be responsible for the return shipping costs.

Check battery charge, brakes and tire condition, and familiarize yourself with the operator interface.

Ride in economy mode, keep tires properly inflated, and avoid rapid acceleration.

Check out your local DMV site and double-check the licensing requirements in your region before you shop for an electric bike.

Under normal usage, your battery can last for 3-4 years.

Yes, you can still pedal it like a regular bike, though it requires more effort.

Avoid over-discharging the battery, store it in a cool and dry place, and charge it regularly.

Cannot start: Check the power switch and battery connection.
Brake noise: Clean the brake disk and adjust the position.
Display is not responding: restart the e-bike and check the connection cable.
Brake Malfunction: Check if the brake cables are loose or damaged. If not, consider replacing the brake caliper or brake lever and cable.
Assist Sensor Malfunction: Step1: Check if the sensor wires are loose or detached. If not, it may indicate a faulty assist sensor. Step2: Disassemble and replace the assist sensor.
Walk Assist Mode Error: Turn off and restart the electric bike (if the issue persists, consider replacing the controller).
Real-Time Mode Error: Turn off and restart the electric bike (if the issue persists, consider replacing the controller).
Low Voltage Error:Step 1: Remove the battery and check if it has sufficient charge. Step 2: Charge the battery. Step 3: If the issue remains after completing the first two steps, it may indicate a faulty motor. Replace the motor.
Motor Malfunction: Check if the motor connection wires are loose, detached, or plugged in incorrectly (if not, it may indicate a faulty motor, consider replacing the motor).
Twist Throttle Malfunction: Check if the connection wires are loose or detached (if not, it may indicate a faulty twist throttle, replace the twist throttle).

Orders will be processed within 48 hours on business days. Once the order has been shipped, a shipping confirmation email will be sent to your email address. We use FedEx for transportation. Please allow 2-7 business days for the shipment to reach your specified location. Pre-order orders will have the estimated shipping date indicated on the product page. Any delivery dates provided by QRONGE are estimated dates.

Please check the cables to ensure they are not loose or disconnected. Simply loosen the black spiral wire cover until the quick disconnect plug is exposed, unplug it, and then reconnect it.  

1. Remove the bolts connecting the front fork and rear fork.

Front Wheel Removal:

(This step is similar to the initial wheel installation)

1. Turn the bicycle over and stabilize it on the handlebars.

2. Use a wrench to loosen the front wheel bolts on both sides. Locate and loosen the front wheel bolts, then remove them with a wrench.

3. Remove the front wheel. Gently lift the front wheel off the front fork.

Rear Wheel Removal:

1. Turn the bicycle over, remove the front fork (as described above), and then remove the bolts connecting the rear wheel.

2. Cut the cable ties and disconnect the motor cables.

3. Remove the derailleur and lift the rear wheel. Disconnect the rear wheel by removing the brake rotor (refer to the installation video or instructions).

1. Brake Failure

Check for loose or damaged brake cables. If not, consider replacing the brake caliper or brake lever, as well as the brake cable.

2. Power Assist Sensor Failure

Step 1: Check for loose or disconnected sensor cables. If not, this may indicate a faulty power assist sensor. Step 2: Remove and replace the power assist sensor.

3. Walk Assist Mode Error

Power off and restart the e-bike (if the problem persists, consider replacing the controller).

4. Live Mode Error

Power off and restart the e-bike (if the problem persists, consider replacing the controller).

5. Low Voltage Error

Step 1: Remove the battery and check for sufficient charge. Step 2: Charge the battery. Step 3: If the problem persists after completing the previous two steps, this may indicate a motor failure. Replace the motor.

6. Motor Failure

Check for loose, disconnected, or incorrectly plugged-in motor cables. If not, this may indicate a motor failure; replace the motor.

7. Throttle Failure

Check for loose or disconnected cables. If not, it may indicate that the rotary throttle is faulty. Please replace the rotary throttle.