Parts and tools catalog
The parts and tools e-bike and scooter repairs call for, grouped by system: what each is for, how to match it to your ride, and the guides that use it.
Tools are at the end, and on their own tools page. For where to buy, see where to buy e-bike repair parts.
Electrical
- Brake cutoff sensorPartThe brake cutoff sensor tells the controller you are braking so it cuts motor power. A stuck one can stop the motor. Replace it like for like and never bypass it.
- E-bike connectorsPartConnectors join the battery, controller, motor and sensors. Most faults are dirt, water or a loose plug. Replace cables with ones made for your system, never by splicing.
- E-bike controllerPartThe controller is the electronics box that runs the motor. Replace it only with the part matched to your bike and display, plugged in at its connectors, or have a pro do it.
- E-bike displayPartThe display shows speed, battery and assist level and often works as the power switch. A replacement must match your model and your controller's protocol.
- E-bike lightsPartMany e-bike lights run off the main battery through a cable. Buy the light made for your model, or one rated for your system's voltage with a matching plug.
- Hub motorPartA hub motor drives the wheel from its center. Replace it as a complete wheel or motor matched to your exact model and version, and leave work inside the motor to a pro.
- Motor cable and hall sensorsPartHall sensors tell the controller where the motor's rotor is, and the motor cable carries their signals and the motor's power. Diagnosis and replacement are pro jobs.
- Pedal assist sensorPartThe pedal assist sensor tells the controller you are pedaling, or how hard. Replacements are system specific, since pedal sensor signals are not standardized.
- Speed sensorPartThe speed sensor reads a magnet on the wheel so the controller knows your speed. Most problems are the magnet or gap; a replacement must be made for your system.
- ThrottlePartThe throttle gives motor power without pedaling. Replace it with the type and plug made for your bike's system, and check brake sensors and plugs before you blame it.
Battery and charging
- Battery charge portPartThe charge port is where the charger plugs in. A loose, wet or burnt port is a pro repair, and a port on the battery pack goes to the maker or a battery pro.
- Battery mountPartThe battery mount, or tray, holds the battery on the frame and carries its power connection. Replace it only with the maker's part, with the battery removed.
- E-bike batteryPartReplace an e-bike or scooter battery only with the maker's pack or a certified replacement it approves. Never use rebuilt packs, and recycle old ones properly.
- E-bike chargerPartUse only the charger that came with your e-bike or scooter, or one its maker approves. Here's why, and how to charge safely.
Brakes
- Brake cablePartBrake cables and housing for mechanical brakes. Use brake-specific housing and the right cable end for your lever.
- Brake leverPartBrake levers on e-bikes often include the motor cutoff switch. Replace a lever with one that fits your brake type and, where your bike has one, a matching cutoff sensor and plug.
- Brake rotorPartThe rotor is the metal disc your brake pads squeeze. Here's when to true it, when to replace it and what to match.
- Disc brake caliperPartThe caliper holds the brake pads and squeezes them onto the rotor. Match the brake type, mount and pads, and align it carefully so it doesn't rub.
- Disc brake padsPartDisc brake pads wear with use and can be ruined by oil. Here's when to replace them and how to pick the right ones.
- DOT brake fluidPartThe hydraulic fluid used in SRAM's Level, Guide, G2 and Code disc brakes. It's not interchangeable with mineral oil and needs careful handling.
- Mineral brake oilPartThe hydraulic fluid used in Shimano, Tektro, Magura and some SRAM disc brakes. Each maker wants its own oil, and it must never go in a DOT brake.
Wheels and tires
- Inner tubePartAn inner tube holds air inside a tube-type tire. Match its size and valve to your wheel.
- SpokesPartSpokes join the hub to the rim and carry your weight and, on a hub motor wheel, the motor's torque. Replacements must match your wheel's gauge, length and nipples.
- TirePartHow to tell when a tire needs replacing and what to match when you buy a new one.
- Tire linerPartA tire liner is a puncture-resistant strip between the tire and tube. Liners are sized by wheel diameter and tire width, so match yours before you buy.
- Torque armPartA torque arm braces a hub motor's axle so it can't spin in the dropouts. It matters most on powerful motors, aluminum dropouts and bikes with regen braking.
- Tubeless sealantPartTubeless sealant is the liquid inside a tubeless tire that seals small punctures. Use the amount on the tire's label.
Drivetrain
- CassettePartThe cassette is the stack of rear cogs. It wears along with the chain and must match your drivetrain.
- ChainPartChains wear with use. Replacing one on time protects the cassette and chainring, and the right chain must match your drivetrain.
- ChainringPartThe chainring is the toothed ring on the crank that drives the chain. A replacement must match your crank's mount, your drivetrain's speed count and, on a mid-drive, the motor.
- Derailleur hangerPartThe derailleur hanger is a small replaceable part that bends in a crash to protect the frame and derailleur.
- FreewheelPartA freewheel is a cluster of rear cogs that threads onto the hub, common on hub motor e-bikes. Removal needs a tool that matches its spline pattern.
- Rear derailleurPartThe rear derailleur moves the chain across the rear cogs. A replacement must match your speed count, gear range and how it mounts to the frame.
- Shifter cablePartThe shifter cable links the shifter to the derailleur. Use shift cable and shift housing, not brake parts, and expect to adjust shifting after a swap.
Grips, saddle and pedals
- GripsPartGrips are the handlebar covers you hold. On e-bikes, check the space beside a twist throttle or shifter, since that side may need a shorter grip.
- PedalsPartPedals thread into the cranks, and the left pedal has a reverse thread. Match the thread size, grease the threads and use a proper pedal wrench or hex key.
- SaddlePartThe saddle is the seat. Pick one by width and riding position, check it fits your e-bike's seatpost, and set its height and tilt after fitting.
Tools
- Axle nut wrenchToolMany hub motor e-bikes hold the wheel with axle nuts instead of a quick release. You need a wrench of the size your maker states, and a torque wrench to refit them.
- Bike degreaserToolBike degreaser strips old oil and grit from the chain and cogs. Finish Line Citrus Degreaser lists at $17.00 at REI and Park Tool CB-4 at $19.95 on Park Tool's store.
- Bike greaseToolBike grease protects threads and bearings from seizing and creaking. Park Tool's PPL-1 PolyLube 1000 4 oz tube lists at $10.95 on Park Tool's store.
- Bike repair standToolA repair stand holds the bike off the ground while you work. E-bikes are heavy, so check the stand's weight rating first.
- Bottom bracket toolToolA bottom bracket tool removes and fits threaded bottom brackets. Match it to your cups by notch count and size; Park Tool's BBT-69.4 lists at $29.95 at REI.
- Brake bleed kitToolA brake bleed kit lets you push fresh fluid through a hydraulic brake to remove air. It must match your brake's fluid type.
- Brake pad spreaderToolA pad spreader pushes hydraulic brake pistons back into the caliper so new pads fit over the rotor.
- Cable cuttersToolCable cutters cut brake and shift cables and housing cleanly without crushing them.
- Cassette lockring toolToolA cassette lockring tool removes and installs the ring that holds a cassette on the rear hub.
- Chain checkerToolA chain checker shows how far your chain has stretched so you can replace it before it wears out the cassette and chainring.
- Chain lubeToolChain lube keeps an e-bike chain quiet and slows wear. Pick dry lube for dusty rides and wet lube for rain; Finish Line's 4 oz bottles list at $12.00 at REI.
- Chain toolToolA chain tool pushes chain pins in and out so you can shorten, remove or install a chain.
- Cleaning brushesToolA few bike brushes make washing and drivetrain cleaning faster and gentler. Park Tool's four piece BCB-4.2 set lists at $25.95 on Park Tool's store.
- Crank pullerToolA crank puller removes crank arms from the spindle. Pick one for your crank bolt size; Park Tool's CCP-22 fits square taper, PowerSpline and Bosch BNI cranks.
- Floor pump with gaugeToolA floor pump with a gauge lets you set tire pressure to the range printed on your tire.
- Hex keysToolWhat hex keys are, which ones an e-bike or scooter owner needs, and how to use them without damaging bolts.
- MultimeterToolA multimeter reads voltage and other electrical values. On Pedalwise it's only for a charger check your maker's guide describes, and never for battery packs.
- Pedal wrenchToolA pedal wrench is a long, thin 15 mm wrench for pedal flats. Park Tool's PW-5 lists at $27.95 on Park Tool's own store.
- Spoke wrenchToolA spoke wrench turns spoke nipples to true a wheel or adjust spoke tension.
- ThreadlockerToolThreadlocker is a liquid that keeps bolts from shaking loose. Use medium strength blue where a part must come apart again; Park Tool's 10 ml bottle lists at $19.95.
- Tire leversToolTire levers help lift a tire bead off the rim without damaging the tire or tube.
- Tire pressure gaugeToolA tire pressure gauge reads the air in your tires so you can set them to the maker's number. Pick one that fits your valve type.
- Torque wrenchToolA torque wrench lets you tighten bolts to the value the maker specifies, so parts neither loosen nor get damaged.
- Torx keysToolTorx keys fit the star shaped bolts on rotors, brakes, stems and some seat clamps. Park Tool's TWS-2 fold-up set lists at $29.95 on Park Tool's store.
- Zip tiesToolZip ties hold e-bike cables clear of moving parts. Keep spares and flush-cutting side cutters on hand, since most electrical part swaps end with new ties.
Guides ask for these, but they have no page yet
- Zip ties
- Main cable (wiring harness)
- Isopropyl alcohol
- Control board assembly (Segway part for the Max G30, shop fitted)
- Replacement accessory or cable (through Rad support)
- Bike degreaser
- Bike grease
- Cable end cap
- Chain lube
- Console (through Gotrax support)
- Replacement cable or component (through Rad support)
- Bike degreaser (chain only)
- Bike grease (metal seatposts)
- Bike grease (top cap bolt threads)
- Brake fluid (mineral oil or DOT, exactly as your brake specifies)
- Cable housing and ferrules (if worn)
- Chain lube (light or wax for dry weather, heavier for wet)
- Dashboard (Segway part for the Max G30)
- Dashboard board (service fitted)
- Disc brake rotor (only if worn past the limit)
- Electrical tape
- Electronic brake (Hiboy S2 and S2 Pro part)
- Front footpad (Onewheel part for Pint or Pint X)
- Front footpad (Onewheel part for your exact model)
- Main wiring harness (through Aventon)
- Mild bike wash or gentle soap
- Mineral brake oil or DOT brake fluid (to match your brake)
- Pad retaining pin and clip
- Pad spring (usually included with new pads)
- Patch kit (for small holes)
- Quick link (new, made for your chain)
- Replacement cable or accessory (through Rad support)
- Rim strip
- Spoke (if one is broken)
- Spoke magnet (only if yours is cracked or missing, from your bike's maker)
- Suspension fork (Super73 S2 replacement)
- Threadlocker (mild, for chainring bolts)
- Thumb throttle (NIU part for your model)
- Tire boot (for a cut casing)
- Tubeless plug (tubeless tires only)
Need a pro?
If these steps didn't fix it, find a shop near you in our partner network of shops that work on electric rides.