Frequently Asked Questions

All Magnum Electric Bikes come with a lithium battery. The Lithium-NCM battery has a life cycle of 700 cycles. Over time your battery capacity will diminish. This means that you can charge and discharge the battery completely 700 times at a discharge rate of 0.5C before the capacity depletes to 80% efficiency.

You will typically get 800-1000 charge cycles out of your battery, as long as you are storing it appropriately. It is best to store indoors and out of extreme hot or cold temperatures.

Always pedal along with your e-bike, especially up hills so the battery is not depleted too quickly. Always keep your battery charged. Lithium batteries life cycle can be extended by not depleting your battery fully. Even if you have not depleted your battery entirely during your ride we suggest that you charge it. Do not overcharge your battery. Be sure not to leave your battery charging for more than 24 hours at a time. 1. Keep out of extreme hot or cold temperatures. 2. Store indoors. 3. Keep out of the rain or snow.

Your e-bike will consume much less battery when you begin riding by pedaling and not using the throttle. Stop and go riding with the throttle can limit the range of your e-bike. Always make sure your tires are inflated properly. Riding on low pressure tires will consume more energy. Always pedal up hills. Do not use throttle only when riding up hills. Use your mechanical gears correctly. When you are pedaling make sure to be in the correct gear. Lower your gears while going up hills and raise the gears on flat and downhill terrain.

Your e-bike has an electric system that is measured by volts and amps. The voltage is the amount of potential electricity your battery holds. The amps or current refers to the speed or rate of flow of electricity as it is being drawn from the battery. The higher the current the quicker the battery will be depleted. High current happens when riding with a heavy load, riding uphill, riding on bumpy and grass terrain etc. The watts is a measure of the output of power that your e-bike can provide. Watts are measured by multiplying the voltage by the current. Example: A 350 watt system can put out up to about 600 watts at peak but will provide 350 watts of power when riding under normal conditions. The rated power of your e-bike will affect the speed and or torque depending on the configuration.

On average the recharge time for our batteries is approximately 6.5 hours.

Batteries are classified by voltage and amp hour. The voltage can be thought of as the size of an engine, this determines the power output. A 48V will be more powerful than a 36V. The amp hour can be thought of as the size of a gas tank. The higher the number, the greater the range. A 17.5ah has a longer mile range than a 13ah battery. *Safety note: Battery voltage should be compatible with the controller and charger you are using. For example, only use a 48V charger with a 48V battery. Using an incompatible charger or controller could damage your battery, bike, or even cause an electrical fire.

Yes. Your trip distance will change in accordance with the denomination you set your display to show (Miles or Kilometers). *Note: the Magnum Cosmopolitan only reads in kilometers and not miles.

The trip distance indication on the display is always "KM". This does not mean to say that the distance showing is in kilometers but rather to indicate to you when you're viewing your trip distance. When your display is set to miles your trip distance reflects the miles traveled.

1. Hold + and - for about 5 seconds

2. You will see the screen change to 8888

3. Using + or - to change numbers and set to toggle

4. Change the code to 8088 “if that doesn't work use 8306 or 8108”

5. The first screen is P. Pedal assist top speed

6. The second screen is throttle top speed.

7. The third screen is the tire size

8. The fourth screen is the odometer

9. The fifth screen is the battery size

10. The sixth screen is power level

11. Hold set to exit back to the home screen (or + and - if it is the L7 display)

1. Check the brakes to be sure they are adjusted properly and not the cause of the noise

2. Ride the bicycle without power to be sure the noise is not originating from any of the other mechanical parts of your E-bike

3. If the problem persists please see your licensed Magnum Bikes dealer

1. Check the battery voltage on the top of your battery

2. Check all of your connections, specifically the connector to the LCD display

3. Remove the battery, then insert it back into place

4. Check if the system may be overloaded (riding up steep hill without assistance, heavy load)

5. If the problem persists please see your licensed Magnum Bikes dealer

1. Check your charger. Please deplete the battery entirely and check the time it takes to complete the charge of your battery from 0-100%. The correct time should be 6.5 hours. If the charge time is less this indicates that the charger is not completing the charge

2. After charging your battery completely, ride it out. Ride the E-bike once and measure your total trip distance to see if the battery is functioning properly. Magnum Bikes support center will want to know the actual range of your battery

3. If you are able, measure the battery voltage when fully charged. The voltage of your lithium battery should be 42V. If it is less than this there is a problem with either your battery or charger

4. If the problem persists please see your licensed Magnum Bikes dealer

Your E-bike motor is attached to the rear wheel, which applies more stress to the spokes than on a regular bike. Because of this, it is essential to check the strength of the spokes periodically. If any spokes are loose, please do not continue riding your E-bike before tightening the spokes. Please note: Continuing to ride with loose spokes will eventually cause all of the spokes to loosen and break.

1. Turn the power of your battery off or remove the battery entirely from your E-bike

2. Disconnect the motor cable quick connector

3. Change the flat tire as you would a regular bike

4. Reconnect the motor plug matching up the arrows on the cable connectors

1. The Magnum Mi5 and Leisger MD5 are both mountain E-bikes. They are made for both off and on road terrain.

2. The Magnum Ui5 and Leisger CD5 are city bikes made for Urban use and we do not suggest using them off road.

Please note: Off road riding will consume more energy from your battery and limit the range of your E-bike. We strongly caution and advise against jumping and rough riding with your E-bike.

Your Magnum e-bike comes with a rear hub geared motor. The motor has its own internal planetary gear transmission. The mechanical gears on your E-bike are externally attached to the motor wheel and allow you to pedal thereby assisting your E-bike. Using the correct mechanical gears is important since when pedaling the motor is assisted and will work quicker and more powerfully.

When riding at night please press the power button on the LCD display once to light the back light on the display.

While we generally suggest that all maintenance on your E-bike is done by someone with ample experience, changing a flat is quite simple. Magnum Bikes all come standard with a quick release plug to allow for easy access to the rear wheel. Anyone with basic bicycle technical experience can easily disconnect the motor cable change the flat and reconnect it. NOTICE: When disconnecting and reconnecting the motor cable be sure that the power is turned off and the arrows on the cable on the motor are matched up.

Your e-bike is water resistant and can be ridden in an average rainfall. We advise against riding in heavy rain and strongly advise against leaving your e-bike outside while it's raining.

1. Keeping your tire pressure correct at all times is important. Correct tire pressure will increase the efficiency of your E-bike and prevent from getting flat tires while riding.

2. The correct PSI varies according to the tire of your E-bike. The maximum PSI can be found on the side of your tire.

If you lose your keys, we sell the entire lock mechanism with new keys. We do not keep stock of single keys for security reasons.

Burley brand bike trailers work well.

Our bikes are made to fit most standard car racks. E-bikes are heavier than regular pedal bikes, so we recommend a rack that is rated to hold at least 60lbs, more if you have more than one bike. We also recommend taking your battery out while transporting as that will be safer for the battery and will make the bike lighter by 7-10lbs. When looking for specific bike racks for your car, we recommend a tray style. Kuat brand car racks work well with Magnum Bikes.

Payload ~ 350lb
Navigator, Ranger, Summit, Navigator, Cruiser, Lowrider, Metro, Metro+, Peak, Pathfinder, Ui6,Ui6+, Mi6, Ui5, Mi5 ~ 265lbs
Premium II, Classic II, Premium, Classic ~ 242lbs
Cosmo ~ 220 lbs

Magnum guarantees the frame, motor, and electrical components are free of manufacturer defect for 1 year from purchase date. Please be sure to register your warranty on our website. Commercial or business use will void a bike's warranty. The other components on our bikes are subject to the different manufacturers' warranties. For example: Shimano, Schwalbe, and Tektro are commonly seen components on our bikes and a Magnum dealer can submit a warranty request to them on your behalf.

You can fill out your warranty registration here. You will need to locate the following serial numbers : Frame, battery, and motor You will also need the purchasing information: Date of purchase, where you purchased, and invoice number.
*The video on the warranty page will also show you how to find your serial numbers.

The frame number is typically stamped into the head tube. In the rare event that it is not, there is also a sticker with a barcode on it. Beneath that barcode you will also find your frame number. You can find a video here that demonstrates how to find it.