GUNAI GN27 27.5" Electric Commuter Bike 750w with 48V 10.4AH Battery,Shimano 7 Speed and Torque Sensor

【Powerful and Brushless Motor】27.5" electric mountain bike is powered by a 750W brushless gear motor.Equipped with medium torque sensor, more precise power control, improved riding efficiency,extended battery life 30%. In addition, the professional Shimano 7-speed transmission system can conquer 40% hill with ease. 【Hidden Removable Lithium Battery 】GUNAI GN27 electric commuter bike with 48V 10.4AH build-in lithium battery support 40-70km riding, Removable power supply makes you charge it on or off the frame, equipped with smart lithium battery charger, fast charging only need 5-6 Hours. 【Adult Electric Bike with 3 Riding Modes】E-bike & assisted bicycle & normal bike,plus a Shimano 7-speed transmission for fast, easy and reliable speed adjustment, making your ride even easier. The intelligent LCD display shows various information such as speed, distance and battery level, and simple on-screen operation activates several functions to make your ride smarter and easier. 【Safety Riding】 27.5inch city electric bike adopts the dual disc brake design. When riding on rough roads, the front suspension with lock function provides soft damping and shock absorption. It is also equipped with adjustable seats, wear-resistant non-slip tyres and bright adaptive LED headlight, which can be used for night riding. 【Professional Customer service】This electric bike with throttle comes 85% pre-assembled. You only need to manually install some simple accessories, such as saddle, pedals, front wheel, handlebar, headlight. After the installation is complete, you can feel free to use it. If you have any questions, please feel free to contact us and we will reply to your message within 24 hours. 【Parameter】 Model: GN27 Battery capacity: 48V10.4AH battery net weight: 6.3 kg Charger: 54.6V2A Charging time: 4-6H Motor: brushless Motor power: 48V750W Maximum speed: 35 km/h Gear: 7 gears Tire specification: 27.5X1.95 Frame: 27.5 high carbon steel Handlebar: steel Seat post height adjustment: High carbon steel, 80-100 cm Fork material: Aluminum Max load: 130 kg Fork suspension: spring suspension Brake: Disc brakes gear: Shimano Net weight: 26KG Gross weight: 31.5 kg Package size: 145.5x24.5x76 CM Product size: 178*63*115CM Electric distance: 40 km Mileage Pedal assistance: 70 km Maximum speed: 35 km/h Torque: 50NM EU/UK Countries Can be delivered within 4-7 Days.You don't have to pay delivery fee. All bikes 90% have been installed, one year warranty on the frame, six months warranty on the battery, controller, instrumentation, etc. If you encounter any problems when you receive the product, please contact our professional after-sales customer service first. Email: lijuping@gunai.store Whatsapp: +86 17841010701 Common bicycle problems and solutions Q: Error code appears on the meter A: Check the manual to see what kind of fault the error code belongs to, follow the instructions to handle it, and if it still doesn't work, provide error code pictures/videos. Q: Charger doesn't work A: First check whether the charger is green or red to green when charging; if the green light is always on, it may be a problem with the charger/charging port/battery, and if the red to green light indicates that the charger is normal, it may be a meter problem. Q: The meter can't be turned on A: Check whether the meter line/controller line is plugged in tightly, and re-plug it; if it doesn't work, it may be a problem with the meter/main line/controller Q: Pedal assist doesn't work A: Check whether the meter parameters are correct, confirm whether the throttle can work, and whether the sensor line is damaged or loose; if all are correct, replace the sensor Q: Rear wheel shakes A: Check whether the spokes are loose and whether they are installed in place; you can tighten the spokes and reinstall the rear wheel. Q: Motor does not work/has strong noise A: Check if the controller is loose, re-plug the motor cable of the rear wheel; provide a video of the noise for the technician to determine what the sound is. Q: Battery does not work/battery life is insufficient A: Measure the battery voltage after fully charging the battery (provide pictures). If the voltage is abnormal, there may be a problem with the battery/battery cover/circuit board. For battery life issues, customers test the battery life under full charge and provide the VOL when fully charged, the ODO (total mileage) when fully charged, the VOL when the battery is exhausted, and the ODO (total mileage) when the battery is exhausted. Q: Pedals cannot be installed A: Check if the left and right pedals are installed/twisted in reverse order. If so, check if the crank/pedal threads are slipped. If slipped, the crank pedals need to be replaced. Q: Brakes don’t work/are not sensitive/leak oil A: Adjust the brakes first/check if the brake pads are worn, if there is oil on the brake pads or discs, insufficient friction/is the brake line loose/leak oil, then you need to replace the brakes directly Q: There is an abnormal sound from the brakes A: It may be the sound of wiping the disc. Ask the customer to check if the disc is deformed. If it is not deformed, adjusting it can solve the problem. The disc is stuck in the middle of the brake (with a gap), not too close to the left or right side of the brake Q: The riser is loose and has a gap A: Check if the headset is aligned and installed, and adjust the headset; if it doesn’t work, replace a headset Common problems and solutions for scooters Q: The meter cannot be turned on A: First check if the line on the back of the meter is plugged in tightly, and re-plug it; if the meter still cannot be turned on after the operation, send a replacement to the customer Instrument/Check if the instrument fuse is burnt out/Check if the instrument or switch plug pin is broken Q: Motor does not work A: If it is a dual motor, swap the front and rear controllers to see if the non-working motor will work normally; Q: Abnormal noise from the motor A: Check if there is an error code on the screen, and provide a video for the technician to determine if the abnormal noise is normal Q: Headlight flickers or does not work A: Check if the line is loose, and re-plug the interface; the step-down board of the light strip may be burned/check if the light switch is available, if not, replace the switch Q: Steering/taillight does not work A: Re-plug the line, if it does not work, re-issue the accessories Q: Brake failure A: Check if the instrument has an error prompt, if so, the brake power-off switch may be faulty, and the power-off switch needs to be replaced; or check if the brake pads are worn out and the brake line is loose Q: Error code appears on the instrument A: Check the corresponding manual to see what kind of fault the error code belongs to, and operate according to the instructions. If it still does not work, provide error code pictures/videos. Q: The charger does not work A: First check whether the charger is green or red-to-green when charging; if the green light is always on, it may be a problem with the charger/charging port/battery, and if the red-to-green light is normal, it may be a problem with the instrument.