Electric bike maintenance: routine checks, cleaning and who fixes what

Short answer: electric bike maintenance covers the same parts as a normal bike, checked more closely, plus a few checks on the electrical system. Weight, speed and motor torque load the chain, cassette, brakes and tyres harder, and Bosch asks for an expert check at least once a year. You can clean, lube, check pressures, contacts and the speed sensor, and install app updates yourself. Motor, battery and controller faults go to an authorised service centre.

What maintenance does an e-bike need?

An e-bike needs the same maintenance as any bike, with more attention on the parts that carry the extra load. BikeRadar's workshop guide puts that load down to the motor's power output, the higher speed and the bike's weight. It says the drivetrain in particular, meaning the cranks, chain, cassette and freehub, is subject to greater forces and increased wear.

Where the extra load shows up:

• Chain, cassette and chainring. A mid-drive motor pushes through the same chain as your legs. Canyon's chain guide says the higher loads can lead to faster chain wear, and BikeRadar warns that a worn chain then wears the chainrings and cassette.
• Brakes. A heavier bike at assisted speed asks more of the pads and rotors. Bosch's spring-check advice has the dealer test hydraulic brakes under pressure, look for discoloured discs and check pad wear.
• Tyres and wheels. Schwalbe says loads and average speeds on a pedelec are mostly higher than on an ordinary bike. BikeRadar's safety check adds bolts and axles at the maker's torque settings and a test for loose spokes.

More load does not mean every job comes round sooner. Bosch's own adviser says an e-bike chain needs lubricating neither more nor less often than a pedal bike's, and that off-road riding and rough shifting are what stress it. Measure chain wear with a chain checker instead.

E-bike maintenance schedule and checklist

An e-bike maintenance schedule works on triggers rather than a fixed mileage: every ride, every wet or gritty ride, once a month, after storage and once a year. Shimano's manual for its e-bike systems says the interval between maintenance depends on use and riding conditions.

Before every ride

Shimano's pre-ride list covers smooth shifting, loose or damaged parts, secure components, abnormal noises and battery charge. Add four quick checks:

• Brakes. Squeeze both levers. They should bite firmly before the lever reaches the bar.
• Tyres. Look for cuts and embedded glass, and press each tyre.
• Battery. Pull on the pack to confirm it is locked in its mount.
• Lights. Shimano's safety notes ask you to make sure the head and tail lights turn on.

After a wet, gritty or muddy ride

Bosch's winter advice is to remove the salt from road spray after riding and let the bike dry well. Wipe the chain dry and lube it once it is dry, and wipe mud off the motor housing and battery mount.

Fazua asks for the connector plug and the charge port to be dry and clean before the battery or charger goes in.

Once a month

• Lube the chain. Bosch's spring-check advice says a good chain lube should go on at least once a month.
• Set tyre pressures with a gauge. Bosch says a tyre loses about one bar a month and that a thumb test is not enough.
• Measure chain wear and look at the brake pads and rotors.
• Check the bolts that hold you up. Bosch singles out the saddle, stem and handlebar.
• Check for software updates in the system's app, where it has one.

After storage

Bosch singles out the end of a long winter break for a tyre pressure check. Pump the tyres, look for cracks, run the pre-ride checks and charge the battery. Where to keep the bike is in our bike storage guide.

How often should an e-bike be serviced?

Bosch asks for an e-bike to be checked by an expert at least once a year, covering the mechanical parts and the system software. Bosch's dealer advice adds a first inspection after about four weeks or 300 kilometres.

Shimano ties the interval to use and riding conditions, and its displays show a spanner icon when the bike is due for maintenance. Fazua publishes no interval and sends service and calibration questions to a dealer or a certified Fazua partner.

A service has a mechanical side, which any competent bike mechanic can do, and a system side: a diagnostic read-out and software check with the maker's dealer tool, such as the Bosch DiagnosticTool.

Tyred's service packages on the pricing page cover the mechanical side. Standard is a full safety check with brakes and gears adjusted and the chain cleaned and lubricated. Essential adds cable replacement, wheel truing and a hydraulic brake fluid check, and Premium adds new tyres and brake pads.

Before you work on an e-bike

Switch the system off and take the battery out before any maintenance, including work on the chain. Bosch's motor manual makes this a safety rule, because switching the system on by accident can cause injury.

A battery built into the frame stays in. Bosch says a permanently installed battery is removed only by an authorised dealer, and asks you to make sure the bike cannot be switched on while you work.

Three more rules from the manuals:

• Keep the bike upright. Shimano says not to turn an e-bike upside down, because the display and switch unit can be damaged. Use a workstand rated for the weight, or lean the bike against a wall.
• Let the motor cool. Bosch warns that parts of the motor housing can exceed 60°C after long climbs or heavy loads at low speed.
• Keep your fingers clear of the chainrings. Bosch says the pedals can turn when push assistance is in use. Shimano warns that its EP801 and EP600 motors with FREE SHIFT enabled can turn the chainrings without anyone pedalling.

The kit is short: a track pump with a gauge, a soft brush, cloths, a mild cleaner, chain lube, a chain checker and Allen keys. No electrical tools are needed.

How to clean an electric bike

Clean an electric bike with a bucket, a soft brush and gentle water, with the system off and the battery out where it is removable. Bosch rates its Performance Line CX motor IP54, and its manual says the motor is designed to be watertight to rain and non-pressure hose washing. The same manual rules out pressure washers and submersion.

1. Switch off, take the battery out, and remove or cover the display. Bosch's care advice is to cover fixed displays and remotes with a cloth or film.
2. Rinse gently. Bosch says high-pressure water can get into the bearings of the motor, hubs and rear frame.
3. Wash with a mild cleaner. Bosch accepts bike shampoo or washing-up liquid that is not strongly degreasing, and Shimano rules out thinners and harsh solvents. Brush the mud out from around the motor housing.
4. Wipe the battery and plastics with a well wrung-out cloth, as Shimano asks. Bosch's manual wants the battery and mount contacts kept clean.
5. Dry the bike, contacts first. Bosch says the mount is designed to drain if the mount and plug area are kept clean.
6. Lube the chain and run a function check. Bosch's check is three questions: battery engaged, drive working, buttons responding.

The full method and the brake precautions are in our guide to cleaning a bike.

Chain, cassette and belt drive on an e-bike

A mid-drive e-bike's chain carries the motor's torque as well as yours, so shift gently and measure wear. Bosch's motor manual advises easing pressure on the pedals briefly for each gear change, which helps the shift and reduces drivetrain wear.

Cleaning and lube. Shimano says a clean, lubricated chain extends the life of the chain, chainrings and sprockets, and warns that acid- or alkali-based rust cleaners can make the chain break. Bosch's rule is to apply lube where the chain runs freely, away from the disc.

The full method is in our chain cleaning guide.

Turning the chain. Switch the system off and turn the cranks backwards by hand. Never use walk assist or a throttle to drive the chain through a rag. On many mid-drives the chainring freewheels from the cranks, so turning the cranks backwards may not move the chain. Lift the rear wheel and turn the pedals forwards instead.

Wear and replacement. Replace the chain at the wear limit, before it takes the cassette and chainring with it. Our chain repair guide explains how to measure it.

Parts around the motor are a mechanic's job. Bosch says the chainring, cranks and pedals must be identical or approved replacements, to protect the motor from overload. Fazua says chainrings must follow the bike maker's specification, and describes a calibration in its Toolbox software after work on the chainring or cranks.

Belt drives. Gates says to wash a Carbon Drive belt with water, not to lubricate it, and not to crimp, twist or backbend it. Too little tension lets the belt skip and too much damages the hub bearings, so leave tension to a mechanic with a gauge.

Brakes, tyres and wheels on a heavier bike

On an e-bike, the brakes, tyres and wheels carry more weight at higher average speeds, so check them by eye whenever the bike is clean.

Brakes

Look into each calliper for pad thickness and along each rotor for discoloured patches. A lever that travels further towards the bar than it used to needs checking before you rely on it.

Bosch's spring-check advice has the dealer replace worn pads and refill and bleed the system as necessary. Pad limits and adjustment are in our brake adjustment guide.

Tyres

Set e-bike tyre pressure with a gauge, inside the range printed on the sidewall. Bosch asks for tyres to be checked for brittleness, cracks and tread depth too.

The maximum printed on the sidewall is the upper limit for the tyre. Our tyre pressure guide and tyre pressure calculator give a riding pressure for your weight and tyre width. Shimano notes that the wrong pressure can make the display's speed and distance readings inaccurate.

Fit a replacement tyre rated for e-bike use. Schwalbe says a 25 km/h pedelec has no legal requirement for a special tyre, but recommends its tyres marked "E-Bike Ready 25" or "E-Bike Ready 50" for pedelecs.

Wheels and bolts

A wheel that wobbles, or a spoke that ticks or feels loose, needs looking at before the next ride; our wheel truing guide covers both. Bosch's manual says not to ride if you suspect something is loose.

When the rear wheel comes out, Bosch asks you not to damage the speed sensor or its bracket, and to route the sensor cable so it is not under tension or kinked. On a hub-motor bike the motor cable and any torque arm come into it too, as our puncture guide explains.

Do e-bike motors need maintenance?

E-bike motors need no maintenance from the rider inside the casing, because the motor is a sealed unit that is not meant to be opened. Bosch's manual says not to open the drive unit, and Fazua says no component of its Ride 60 system can be repaired by the user.

What the motor and its electronics need is care on the outside:

• Housing and mounts. Clean off the mud and look for cracks or missing bolts. Bosch says not to paint any part of its drive system.
• Cables and connectors. Look for chafed or kinked cables and loose plugs, without pulling connectors apart. Shimano asks for dummy plugs in unused E-TUBE ports.
• Battery contacts. Keep them clean and dry. Bosch says the contacts are coated against corrosion, and technical vaseline may be used if needed. Never spray anything into a port.
• Speed sensor and magnet. Bosch's smart system manual sets the gap between magnet and sensor at 2–15 mm. The magnet sits on a spoke or the brake rotor, and Bosch's rim magnet needs no separate sensor.

A magnet knocked out of line stops the speed reading. Bosch's older motor manual sets its gap at 5–17 mm and lets riders loosen the spoke magnet's screw and reset it, while Shimano sends the job to the place of purchase.

Hub motors are sealed in the same way. Their outside checks are the axle nuts or through-axle, the torque arm where fitted, and the motor cable where it leaves the axle.