Maintaining an electric bike does not mean taking it apart every few weeks.

For the Shengmilo S700 Pro, the most important maintenance comes from using the bike correctly, checking key systems regularly, keeping the bike clean and dealing with small problems before they become serious.

The S700 Pro combines a powerful dual-motor system, a large-capacity battery, hydraulic brakes, fat tires and a Shimano 7-speed drivetrain. These systems do not require complicated daily maintenance, but they do require the right care.

This guide focuses on the maintenance tasks that matter most in real-world use.

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1. Start With a Quick Pre-Ride Check

Before every ride, spend two or three minutes checking the bike.

Make sure the battery is properly installed and locked.

Squeeze both brake levers and make sure the braking response feels normal.

Check the tires for:

• Nails or glass

• Cracks

• Bulges

• Excessive wear

Spin the wheels and make sure they rotate smoothly.

Finally, check the handlebar, saddle and other major mounting points for obvious looseness.

These simple checks can identify many problems before they become serious.

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2. Battery Care: Good Charging Habits Matter Most

The S700 Pro uses a 48V 25Ah lithium battery.

For a lithium battery, proper charging and storage habits are more important than frequently removing or opening the battery.

Do not regularly drain the battery completely

Avoid making a habit of riding until the battery is completely empty.

When the battery becomes low, recharge it rather than repeatedly running it to zero.

If the bike will not be used for an extended period, do not leave the battery completely discharged for a long time.

How to charge correctly

Charge the bike in a:

• Dry location

• Well-ventilated area

• Cool environment

• Location away from direct sunlight

Do not cover the charger while it is operating.

After a long ride, extended climbing or heavy use, allow the battery to cool before charging.

If you notice unusual heat, an unusual smell or any other abnormal behavior during charging, stop charging immediately.

Shengmilo's maintenance guidance recommends avoiding extreme temperatures and charging or storing the battery under suitable environmental conditions.

How to maintain the battery connector

Periodically inspect the battery connector.

If you see dust, gently clean it with a dry, soft cloth.

If you notice corrosion, burning, discoloration, deformation or a loose connection, stop using the connector and have it inspected.

Never open the battery housing or attempt to replace internal battery cells yourself.

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3. Motor and Electrical System: Inspect, Don't Disassemble

The S700 Pro's dual-motor system provides strong power, but regular riders do not need to open the motors for maintenance.

The better approach is to keep the motors and electrical connections clean and dry and pay attention to changes in performance.

Clean the motor area after dirty rides

After riding through mud, sand or wet conditions, remove dirt from the outside of the motor using a soft cloth.

Do not use a pressure washer directly on the motor, battery connector, controller or other electrical components.

A damp cloth is usually sufficient for normal cleaning, followed by drying.

Shengmilo also recommends keeping water away from the motor and using a soft cloth for routine cleaning.

Pay attention to unusual sounds

Do not automatically assume that every strange noise means the motor has failed.

A clicking or rubbing sound may come from the brake rotor, wheel, tire or another mechanical component.

However, if you notice persistent:

• Clicking

• Grinding

• Unusual humming

• Strong vibration

stop high-load riding and investigate the source.

If the abnormal noise clearly comes from the motor, professional inspection is recommended.

Check the electrical connections

If the bike suddenly loses power, a motor cuts in and out or one motor stops working intermittently, inspect the relevant connectors.

Make sure the connections are:

Secure, dry and free from visible damage.

If the problem remains after confirming the connection, avoid repeatedly unplugging and reconnecting the components and contact customer support.

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4. Brake Maintenance: Deal With Changes Early

The S700 Pro uses hydraulic brakes.

Brake maintenance is less about following a strict calendar and more about noticing changes in braking performance.

How to check the brakes

While the bike is stationary, squeeze both brake levers.

The levers should provide consistent resistance.

Pay attention if:

• The lever suddenly feels very soft

• Braking power decreases

• Stopping distance becomes longer

• Unusual brake noise develops

These are signs that the brake system should be inspected.

When should brake pads be replaced?

Brake pads are wear components.

They become thinner as they are used.

If the pads are close to their wear limit or braking performance has noticeably decreased, replace them with compatible pads.

Shengmilo's maintenance guidance recommends checking brake-pad wear regularly and replacing heavily worn pads.

What if the rotor gets contaminated?

If oil or another contaminant gets onto the brake rotor, do not continue high-speed riding.

Clean the rotor using an appropriate brake-cleaning method.

Never spray chain lubricant or other oils near the brake rotor or brake pads.

If hydraulic fluid is visibly leaking from the hose, caliper or lever, stop riding and have the system inspected.

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5. Tire Maintenance: Pressure Is Easy to Ignore

The S700 Pro uses 26 × 3.0 fat tires.

Many riders assume that reduced range or increased riding resistance must be caused by the battery or motor.

Sometimes the actual cause is simply incorrect tire pressure.

How should tire pressure be checked?

Do not rely only on squeezing the tire by hand.

Use a pressure gauge and adjust the pressure according to the range marked on the tire sidewall or the applicable bike documentation.

If the pressure is too low:

• Rolling resistance increases

• Energy consumption increases

• Tire wear can accelerate

• The rim receives greater impact

If the pressure is too high, comfort and traction may be reduced.

The goal is to maintain an appropriate pressure rather than simply choosing the lowest or highest possible pressure.

Shengmilo also recommends regularly checking tire pressure with a gauge.

Inspect the tires after riding

If you regularly ride on gravel, trails or rough roads, inspect the tire surface after riding.

Remove embedded objects such as nails or glass as soon as possible.

If you find a serious bulge, deep crack or excessive wear, stop using the tire and replace it.

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6. Chain and Drivetrain: Noise Is Often the First Warning

The Shimano 7-speed drivetrain does not require complicated daily maintenance, but the chain should remain clean and properly lubricated.

When should the chain be cleaned?

There is no need to follow a rigid mileage schedule.

Clean the chain more frequently if you regularly ride in:

• Rain

• Mud

• Sand

• Dusty conditions

The correct cleaning method

First remove dirt and sand using a soft brush.

Apply a suitable bicycle chain cleaner.

Wipe the chain dry.

Then apply a small amount of bicycle-specific chain lubricant to the chain rollers.

Do not flood the chain with lubricant.

Rotate the crank several times so the lubricant can reach the moving parts, then wipe away excess oil from the outside of the chain.

This reduces the amount of dirt that sticks to the drivetrain.

What if shifting becomes difficult?

If you notice:

• Difficulty shifting

• Gear skipping

• Chain dropping

• Persistent drivetrain noise

first inspect the chain and derailleur for dirt, lack of lubrication or visible damage.

If cleaning and basic inspection do not solve the issue, have the drivetrain professionally adjusted.

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7. Clean the S700 Pro Without Pressure Washing

One of the easiest ways to damage an electric bike during cleaning is using a high-pressure washer.

A better method is:

Soft cloth + clean water + mild cleaner.

Remove dirt from the frame and tires with a soft cloth.

Then clean heavily contaminated areas carefully.

Avoid forcing water into:

• Battery connectors

• Charging ports

• Display connections

• Controller areas

• Motor connectors

After cleaning, dry the bike and allow electrical connections to dry completely.

Shengmilo's maintenance guidance also recommends avoiding high-pressure water around electronic components.

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8. Do Not Ignore the Frame and Fasteners

The S700 Pro is a high-power dual-motor e-bike.

After extended use on rough roads or off-road terrain, inspect the main mounting points.

You are not looking for a reason to remove every bolt.

Instead, look for:

• Loose components

• Missing fasteners

• Unusual movement

• Frame cracks

• Abnormal weld areas

A more thorough inspection is recommended after long rides, rough off-road use or a collision.

If you find a crack or significant deformation in the frame:

Stop riding immediately.

Do not attempt to weld or structurally repair the frame yourself.

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9. Match Maintenance to Your Riding Environment

The maintenance requirements of a commuter bike are different from those of an off-road bike.

Mainly city riding

Focus on:

Tire pressure, brakes, chain, battery and fasteners.

Riding in the rain

Dry the bike after the ride.

Pay particular attention to:

Brakes, chain and electrical connections.

Mud or sand riding

Clean the bike as soon as practical.

Inspect:

Tires, chain, motor exterior and brakes.

Long-distance riding

Before leaving, check:

Battery level, tire pressure, brakes, wheels and major fasteners.

This simple preparation can prevent many problems from appearing halfway through a ride.

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10. A Simple Maintenance Schedule

You do not need to perform a complete service every day.

Use this routine instead:

Before every ride

Check the battery, brakes, tires and wheels.

Every week

Check tire pressure, chain condition and obvious looseness.

Every month

Inspect battery connectors, motor wiring, brake pads, front suspension and major fasteners.

After long-distance or off-road riding

Clean the bike and inspect the tires, chain, brakes and electrical connections.

Whenever something changes

Do not wait for a small problem to become a major failure.

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11. When Should You Stop Riding?

Some problems can be solved with cleaning, adjustment or replacement of normal wear parts.

However, stop riding if you notice:

• Battery swelling or abnormal heating

• Unusual battery odor or visible damage

• Hydraulic brake leakage

• Significant loss of braking power

• Severe tire bulging or cracking

• Persistent abnormal motor noise

• Strong motor vibration

• Frame cracks or major deformation

• Burned, melted or seriously damaged wiring

These conditions may involve safety-critical or electrical components and should be inspected before the bike is used again.

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The Most Important S700 Pro Maintenance Rules

Maintaining the S700 Pro does not require frequent disassembly.

The most effective routine is simple:

Check before riding → Use the bike correctly → Clean it regularly → Identify changes early → Fix problems properly.

Take care of the battery's charging and storage environment.

Keep the motor and electrical connections clean and dry.

Pay attention to changes in braking performance.

Maintain correct tire pressure.

Keep the chain clean and lubricated.

Check the bike's main fasteners and structural components as the bike accumulates mileage.

For internal battery work, motor disassembly, controller repairs or hydraulic brake servicing, avoid attempting complex repairs without the proper knowledge and tools.

If you cannot identify the cause of a problem, stop riding and contact Shengmilo customer support or a qualified bicycle technician.

Good maintenance does not need to take hours.

A few minutes of regular inspection can help the S700 Pro maintain reliable power, stable handling and a better riding experience over the long term.