All bikes in Magnum’s current lineup come with a two-year manufacturer’s warranty. Outlet/certified pre-owned bikes come with a one-year warranty.

Register at magnumbikes.com/pages/product-registration. You’ll need your serial number (located on the frame, front of the stem tube below the Magnum logo), the retailer name, and date of purchase.

Changing a flat can be done by a home mechanic with the right tools. Front tires are easier to repair. For rear tires, the hub motor must be removed and reinstalled carefully — pay close attention to the no-turn washer orientation. See our Magnum Academy guide for full instructions.

Materials Needed

• Crank arm puller tool (specific to your model)
• Allen wrench or pedal wrench
• Replacement crank and/or pedal (if threads are severely damaged)
• Thread repair kit or professional shop assistance (optional)

Steps

1. Remove the damaged pedal — counterclockwise on the right side, clockwise on the left.
2. Use the crank arm puller tool to remove the crank arm from the bottom bracket.
3. Inspect threads. If damage is superficial, clean and apply grease before reinstalling.
4. For severely damaged threads, use a thread repair kit or replace the crank arm.
5. Reinstall the crank arm in reverse and securely fasten the pedal to spec torque.

Tips

• Always apply grease to pedal threads when installing.
• Regularly inspect pedals and crank arms for wear.
• If unsure, visit your nearest authorized Magnum dealer.

Magnum warrants New Electric Bicycles against manufacturing defects for one (1) year from original retail purchase (6 months for Certified Pre-Owned). Registration must be completed within 90 days of purchase. Covered components: frame, motor, battery, display console, and controller.

This warranty does not cover tires, spokes, brakes, rims, or damage from negligence, accidents, or inadequate maintenance.

To submit a warranty request: Magnum Help Center →

Refer to the official Magnum Bikes maintenance schedule below.

Power on: Press the top power button. Use Up/Down to change PAS level.
Single press Power: Toggle between Odometer and Trip Odometer.
Hold Up: Turn on headlight.
Hold Up + Power: Enter settings menu.

Settings Menu

1. Tire size — leave at 21 inches
2. Units — switch between km and mph
3. Top Speed — use code 0579 to toggle between 20 or 25 mph
4. Battery Info — typically reads “0”
5. Version — software information
6. Mode — Speed or Torque (Torque for quicker acceleration)
7. Trip — reset trip odometer with the Down button

Power on your display, then press the power button once more. This activates the LCD backlight.

We only sell keys as a set with new lock mechanisms. If you lose your battery keys, you’ll need a new lock. Submit a service request at Magnum Customer Support.

Volts: The potential electricity your battery holds. Generally constant.

Amps: How quickly your battery draws electricity. Higher drain when riding with a heavy load, uphill, or on rough terrain.

Watts: Output power. Formula: Voltage × Amps = Watts. A 350W system peaks around 600W but provides 350W under normal conditions.

Typically 800–1,000 charge cycles before capacity reaches ~80% efficiency. To maximize lifespan: store indoors, avoid extreme temperatures, and charge when down to one bar rather than fully depleting.

Approximately 6–8 hours from fully discharged to 100%. Charging is fastest from 0–80%, then slows slightly to reach full capacity.

• Always pedal with your e-bike, especially uphill, to reduce battery drain.
• Keep the battery charged — avoid fully depleting it.
• Charge after each ride even if not fully depleted.
• Do not overcharge — remove charger within 24 hours.
• Keep the battery out of extreme hot or cold temperatures.
• Store indoors; keep it out of rain or snow.

Payload: ~350 lbs

Navigator, Ranger, Summit, Cruiser, Lowrider, Metro, Metro+, Peak, Pathfinder, Ui6, Ui6+, Mi6, Ui5, Mi5: ~265 lbs

Premium II, Classic II, Premium, Classic: ~242 lbs

Cosmo, Cosmo+, Cosmo S, Cosmo X: ~220 lbs

Use a rack rated for at least 60 lbs per bike. We recommend a tray-style rack — Kuat brand racks work well with Magnum Bikes. Always remove the battery before transporting to reduce weight and prevent loss in transit.

Magnum Bikes work with Burley trailers using the updated hitch that fits over 12mm solid axles. These are the only hitches we have tested and can safely recommend.

Important: Remove a circular washer on the side of your bike opposite the rear hub drive to compensate for the hitch width. Axle nuts and no-turn washers must be installed correctly and tightened to spec.

First, verify the charger is working (LED turns green when plugged in, red when charging). Try a different outlet if needed.

If the charger LED doesn’t light at all:

1. Contact info@magnumbikes.com to check warranty status — Magnum will ship a replacement if within warranty.
2. If out of warranty, purchase a new charger at magnumbikes.com.

If charger works but battery still won’t charge:

Use a voltage meter to check battery health. Automotive parts stores will often test voltage for free. If below minimum voltage, the battery may need replacing.

If battery is dead:

1. Contact support to check warranty — Magnum will ship a free replacement if within warranty.
2. If out of warranty, purchase at magnumbikes.com/collections/batteries.

If both test healthy, check for a tripped charging fuse on the exterior of the battery. Internal fuses should only be serviced by a trained professional.

This usually indicates a specific throttle issue rather than a system-wide failure. Visually inspect the throttle — ensure it isn’t caught on another handlebar component (shifter, bell, etc.). Loosen the throttle clamp bolt and slide it away if needed.

If it moves freely, inspect the connector pins. Bent or missing pins indicate a throttle replacement is needed. Do not plug a damaged connector into other components. Visit an authorized dealer or follow the Throttle Replacement How-To Guide in the Help Center.

The frame number is typically stamped into the head tube. In rare cases, check the barcode sticker on the frame — the number appears beneath the barcode. You’ll need this for warranty registration at magnumbikes.com/warranty.

Summit, Peak T5, Peak T7: Mountain e-bikes designed for both off and on-road terrain.

Nomad, Scout: Fat tire bikes designed for both off and on-road.

All other models can handle easy to intermediate rail trails, but not all off-road trails. We strongly caution against jumping and rough riding. Off-road riding consumes more battery and limits range.

First, check that all motor connection cables are secure. Then unplug the motor cutoffs from your cable tree — if the motor engages, the motor cutoffs are faulty and need to be replaced. Contact Customer Support at 323-375-2666.

Your Magnum e-bike has a rear hub geared motor with its own internal planetary gear transmission. The mechanical gears are externally attached to the motor wheel, allowing the pedal-assist system (PAS) to translate pedaling into motor assistance.

Using the correct gear is important — PAS amplifies the effect of poor gear selection. Avoid cross-chaining. See the Magnum Academy article on Dropped Chain: Causes, Fixes, and Prevention.