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E-Bike Parts: chargers, batteries, controllers, brakes, tires and more

Replacement parts are where mistakes get expensive. Each category explains how to identify what you have (voltage, connector, size, mount) before you buy. If your bike is misbehaving and you are not sure which part is at fault, start with an E-Bike Assessment instead of guessing.

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All e-bike parts

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E-Bike Controllers

36V/48V 15A Dual-Mode Controller for 250W–350W Hubs (generic)

Small folding and commuter e-bikes with 250W–350W hub motors use compact 15A controllers that tuck into a frame cavity or under the rack. The dual-mode versions can run with or without hall sensors, which makes them forgiving when a hall wire has failed. Many budget bikes use a controller like this paired with a simple LED or LCD, so the catch is always the display protocol and the connector set. Buy one when your bike's original is out of stock, and be prepared to swap the display and throttle to matching parts if the protocol is unknown.

Best for: Small-motor folding and commuter e-bikes · Replacing a controller in a tight frame cavity · Bikes with a suspect hall sensor (dual-mode runs sensorless in a pinch)

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E-Bike Controllers

48V 1000W 35A Brushless Controller (generic)

The bare-bones 48V 1000W controller with a bundle of labeled leads is the universal patient in the generic direct-drive conversion world. It is a square wave controller, so it hums a little under load, but it is cheap, tolerant, and its wiring is well documented on forums. Most include throttle, brake, PAS, hall and phase leads plus a three-speed or cruise lead. It is the right purchase when the original controller on a generic kit fails and you just need the bike moving again. It is the wrong purchase if you expect it to drive a branded display.

Best for: Generic 48V 1000W direct-drive conversion kits · Riders who want a cheap, available fix for a dead controller · Builders comfortable matching wire colors and connectors

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E-Bike Battery Chargers

48V 3A Faster E-Bike Charger, 3-Pin XLR Plug (generic)

If your 48V pack has a 3-pin XLR charge port and you want to cut charging time, a 3A unit is the sensible upgrade over the stock 2A brick. It is still a slow rate in absolute terms, so it is easy on the cells, but it trims a couple of hours off a 15–20Ah pack. As with any generic charger, buy by the spec sheet: 54.6V output, 3A, XLR plug, correct pin-out. Make sure your battery's BMS is rated for at least 3A charge current (nearly all are) and that the original charger was also XLR, not a barrel.

Best for: 48V packs with an XLR port and 15Ah or more capacity · Commuters who charge twice a day · A faster spare when the stock 2A brick is too slow

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E-Bike Batteries

52V 20Ah Hailong Downtube Battery (generic)

A 52V 20Ah pack is what people buy when they want more range and a little more punch from a bike or conversion kit that can tolerate it. The 52V nominal (58.8V full) is a drop-in for many 48V controllers whose capacitors are rated for it, but not all, so this is an upgrade that requires confirmation. At 20Ah the pack is long and heavy, usually in the taller Hailong-3, DK or Jumbo Shark style case, which will not fit every frame triangle. Measure your downtube clearance before you order and expect to also buy a 52V charger.

Best for: Riders who want a long-range upgrade on a compatible 48V/52V system · Mid-drive kits (BBS02/BBSHD) that accept 52V · Larger frames with room for a long downtube case

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E-Bike Battery Chargers

52V 2A E-Bike Charger, 3-Pin XLR Plug (generic)

A 52V pack needs a 58.8V charger, and the 3-pin XLR plug is the most common fitting on the 52V Hailong and rack packs sold to kit builders. Mixing this up with a 48V charger is a classic mistake: a 54.6V charger will leave a 52V pack permanently under-charged, while a 58.8V charger on a 48V pack is dangerous. This generic 2A unit is the slow-and-steady option; heavier packs may benefit from a 3A or 5A unit if the BMS allows it. Confirm the XLR pin assignment matches your battery before the first plug-in.

Best for: 52V Hailong or rack-mount packs with an XLR charge port · BBS02/BBSHD builds running 52V · Riders who lost or wore out the original 52V charger

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Pedal Assist Sensors

8-Magnet Split-Ring PAS Sensor (generic)

The split-ring cadence sensor exists for one reason: it clips around the crank spindle without pulling the crank arm off, so it is the easy-install option for riders without a crank puller. The magnet disc splits in two and screws back together, and the sensor mounts on a bracket against the bottom bracket shell. With 8 magnets the response is a touch slower than a 12-magnet disc, but for neighborhood riding you will rarely notice. It is a solid fix for a broken PAS disc when you want the job done in fifteen minutes.

Best for: Riders without a crank puller · Quick PAS repairs on kit bikes · Frames where the standard disc does not clear the chainring

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Handlebars & Stems

Adjustable Angle Stem, 1-1/8 Threadless, 31.8 mm Clamp (generic)

An adjustable stem is the quickest way to raise the bars and sit more upright, which is what most e-bike riders with wrist or neck discomfort want. These alloy stems clamp a 1-1/8 inch threadless steerer and a 31.8 mm bar (25.4 mm versions exist), and a single bolt lets you set the angle anywhere from flat to near vertical. They are heavier and slightly flexier than a fixed stem and the angle bolt must be torqued properly. Check your steerer diameter and bar clamp size before ordering; folding bikes often have a proprietary stem that these do not replace.

Best for: Riders who want a more upright position · Fitting a bike that feels too stretched out · Commuters adjusting reach without buying several fixed stems

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Pedals

Aluminum Folding Pedals, 9/16-Inch (generic)

Folding e-bikes come with folding pedals so the bike fits in a trunk, and the stock ones are usually small plastic units that flex and wear. The generic aluminum folding pedal is a clear upgrade: a larger platform, a positive latch, and sealed or at least serviceable bearings. Many brands sell what is essentially the same pedal. Check the thread size on your crank: most adult folders use 9/16-inch, but some budget bikes use 1/2-inch. The fold mechanism adds weight and a bit of play compared with fixed pedals, so do not expect mountain-bike stiffness.

Best for: Folding e-bikes with worn or flimsy stock pedals · Apartment and transit commuters who fold daily · Riders wanting a bigger platform that still folds

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Connectors & Plugs

Amass XT60 Connectors, 5 Pairs

The XT60 is the standard battery-to-controller plug on a huge number of kit bikes and budget e-bikes, and Amass is the original manufacturer whose yellow plugs the clones copy. Genuine Amass connectors have tighter tolerances and better gold plating, which matters on a connection carrying 20–30 amps. A pack of five pairs gives you spares for a battery swap, a controller change, or a repair after a melted plug. Soldering is required; use a hot iron, heavy wire and heat shrink, and if you are not comfortable soldering high-current leads, have a professional do it.

Best for: Replacing a melted or loose XT60 on a battery or controller lead · Conversion builders standardizing on one plug · Making extension or adapter leads

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Connectors & Plugs

Anderson Powerpole 45A Connectors (Housings and Contacts)

Anderson Powerpoles are the modular red-and-black connectors used on many higher-end kit batteries and on the discharge leads of some production e-bikes. The 45A contacts suit 10–12 gauge wire and the housings snap together into a keyed pair. They are crimped rather than soldered, which some builders prefer, but they need the proper crimper to be reliable; a poorly crimped Powerpole is a heat source. Buy genuine Anderson housings and contacts — the clones fit poorly and the contacts lose spring tension under vibration.

Best for: Replacing or extending Powerpole battery leads · Builders who prefer crimp connections to solder · Making a second charger or discharge lead

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E-Bike Motors

Bafang BBSHD 48V/52V 1000W Mid-Drive Conversion Kit

The BBSHD is the BBS02's bigger sibling: a 1000W nominal mid-drive with a beefier case, a 30A controller, and a reputation for taking abuse that the BBS02 would not survive. It is the pick for heavy riders, cargo hauls, steep terrain, and fat-bike conversions, and it is happy on 52V packs. The trade-offs are weight, a wider Q-factor at the pedals, and more chain wear than any hub motor. Like the BBS02, it ships as a kit without a battery and needs a threaded bottom bracket shell in the matching width.

Best for: Heavy riders and cargo conversions · Fat bikes (100/120 mm shell versions) and steep hills · Riders who want more headroom than a BBS02B

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E-Bike Displays

Bafang DP C18 Display (UART) for BBS02/BBSHD

The DP C18 is one of Bafang's most common displays for BBS02 and BBSHD mid-drive kits: a color LCD with a separate button pad, speed, battery, assist level, and a settings menu that lets you set wheel size and speed limit. Bafang sells it in UART and CAN versions that look the same and are not interchangeable, so the first job is to know which protocol your motor uses (BBS02/BBSHD kit motors are typically UART). Replacement is plug-and-play if the protocol and connector match; otherwise it is an expensive paperweight.

Best for: BBS02B and BBSHD kits with a failed or cracked display · Riders upgrading a small Bafang display to a color screen · Anyone who wants a known-quantity Bafang accessory

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Seats & Saddles

Bikeroo Oversized Comfort Bike Seat

Bikeroo's oversized seat is one of the most-bought comfort saddles on Amazon, and it is usually purchased by riders who got a new e-bike and discovered the stock seat is a plank. It is extra wide with thick foam and elastomer springs, attaches with standard rails, and most listings include a cover and a mounting adapter for older single-bolt posts. It is built for upright riding; if you lean forward or pedal hard, you will want something narrower. It is a cheap experiment that fixes a lot of complaints about short rides.

Best for: New e-bike owners unhappy with the stock saddle · Upright cruiser and step-through bikes · Short to medium casual rides

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Seats & Saddles

Cloud-9 Cruiser Select Saddle

The Cloud-9 Cruiser Select is the wide, sprung comfort saddle that bike shops have sold for years to riders who sit upright and want to stop thinking about their seat. On an e-bike ridden at neighborhood and commuter pace with little weight on the pedals, that upright position makes a wide saddle with springs a sensible match. It fits a standard rail clamp, so it swaps onto nearly any seatpost. The coil springs and thick foam suit casual riding; sportier riders will find it too wide and bouncy for long pedaling efforts.

Best for: Upright cruiser, step-through and commuter e-bikes · Riders replacing a narrow or hard stock saddle · Casual and neighborhood riding

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E-Bike Tires

CST BFT (Big Fat Tire) 26x4.0

CST's BFT (Big Fat Tire) is a widely fitted original-equipment tire on 26x4 fat e-bikes and one of the cheapest ways to replace a worn one. The tread is a medium-knob all-rounder: it handles hardpack, sand and snow acceptably and hums a bit on pavement, which is the normal deal with fat tires. Wire-bead versions are the common, inexpensive ones; folding versions exist at a higher price. If you spend most of your time on the road, a smoother fat tire will roll easier, but for mixed use the BFT is a sensible default.

Best for: Replacing stock tires on 26x4 fat-tire e-bikes · Mixed pavement and trail riding · Budget-minded riders

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Mountain bike drivetrain components

Freewheels

DNP Epoch 7-Speed Freewheel 11-28T

The DNP Epoch is the upgrade freewheel for hub-motor e-bikes: an 11-tooth small cog instead of the usual 14, which gives you a usefully taller top gear so you can still pedal along at 20–28 mph rather than spinning out. It is a thread-on 7-speed unit with a nickel finish and is a direct swap for the Shimano TZ-series on most bikes. Shifting is a touch less refined than Shimano and the pawls can be noisy, but for riders who pedal along with the motor, the 11T is the main reason to buy it.

Best for: Class 2/3 e-bike riders who spin out in top gear · 7-speed thread-on hub-motor bikes · Upgrading a worn stock freewheel

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Hub Motors

Ebikeling 48V 1200W Direct-Drive Rear Wheel Conversion Kit

Ebikeling is one of the few hub-kit brands with a US base and actual customer support, which is why its 48V 1200W direct-drive rear kit shows up so often in forum recommendations. The wheel comes pre-laced in 26, 27.5, 28/700c or 29-inch sizes with the controller, LCD, throttle, PAS sensor and cut-off levers. Direct-drive motors are quiet and durable but heavy, and they have a little magnetic drag when pedaling unpowered. This is a good flat-land commuter kit; for steep climbs a geared hub or mid-drive is smarter.

Best for: Flat to rolling commutes where quiet and durability matter · First-time converters who want a complete kit with support · Steel or aluminum frames with 135 mm rear dropouts

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Throttles

Half-Twist Throttle with Key Switch and Battery LEDs (generic)

The half-twist throttle with an integrated key switch and a three-LED battery gauge comes bundled with countless generic hub conversion kits. It replaces the inboard half of the right grip and twists like a motorcycle throttle. The key switch wires into the controller's ignition lead, so this one part is both throttle and power switch. Replacements are easy to find, but the lead is usually bare wires or a small non-waterproof plug rather than Julet, and the LED voltage gauge must be ordered for your pack voltage (36V or 48V).

Best for: Generic 36V/48V hub conversion kits that came with a keyed twist throttle · Riders who want a power key on the bars · Budget replacements

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Kickstands

Heavy-Duty Adjustable Side Kickstand, 24–29-Inch (generic)

The stock side stand on many e-bikes is too weak for a 60–75 pound bike and folds under on soft ground. A heavy-duty alloy side stand with an adjustable-length leg and a wide foot is the common upgrade. Most mount through the standard chainstay plate behind the bottom bracket; some bikes have a dedicated rear-mount plate at the dropout, so check yours before ordering. Adjust the leg so the bike leans about ten degrees — too upright and it tips in a breeze, too far and the handlebars flop. A thicker foot also helps on hot asphalt.

Best for: Replacing a weak stock side stand · Bikes with a standard chainstay mount plate · Riders who park on uneven ground

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Brake Levers

Hydraulic Brake Cut-Off Sensor with Magnet (generic)

When you convert a bike with hydraulic brakes, you usually do not want to swap out the levers. The fix is a stick-on cut-off sensor: a small hall sensor that glues to the lever body with a magnet on the lever blade, so the signal is sent as the blade moves. Sold in pairs, typically with a 2-pin Julet waterproof plug or bare wires. Installation is simple but placement matters — the magnet must sit within a few millimeters of the sensor at rest and move away when you pull. A little patience with the alignment makes the difference.

Best for: Mid-drive and hub conversions on bikes with hydraulic brakes · Riders who want to keep their existing levers · Replacing a failed sensor on a bike that uses this style

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Racks (Parts)

Ibera PakRak Touring Carrier Plus Rear Rack

Ibera's PakRak is a popular Amazon alternative to shop-brand racks: an alloy carrier with adjustable stays, a disc-brake-clearing design, a quick-release top plate for Ibera's own bags, and a higher published capacity than most commuter racks. It fits 26 to 29-inch wheels with eyelets and includes a tail-light bracket. Owners like it for the price and the stiff top deck; the quick-release plate is handy but adds a little height that can make tall panniers sit high. As always with racks, the frame must have mounting points for it to work properly.

Best for: Commuter and hybrid e-bikes carrying heavier loads · Riders who want a quick-release top bag system · Budget-minded rack buyers

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Wiring Harnesses

Julet 1T4 Main Wiring Harness (Display, Throttle, 2x Brake) (generic)

The 1T4 harness is the backbone of most Julet-connector kit bikes: one multi-pin plug into the controller splits into a 5-pin display lead, a 3-pin throttle lead and two 2-pin brake-sensor leads, all waterproof. When a connector corrodes or a lead gets crushed, replacing the whole harness is faster than repairing one branch. The trap is that 1T4 harnesses come in several pin counts at the controller end and with different lead lengths, so match the controller-side plug and count the pins before ordering. Take a photo of your old harness's plugs for comparison.

Best for: KT and similar kits with Julet waterproof connectors · Replacing a corroded or damaged main cable · Tidying up a conversion with bare-wire connections

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Wiring Harnesses

Julet 5-Pin Display Extension Cable, 30–60 cm (generic)

Raising the bars, fitting a longer stem or moving a display often leaves the cable an inch too short, and the Julet 5-pin extension is the fix. It is a male-to-female waterproof lead in the same keyed format as the display connector on most KT, Lishui and generic controllers. Lengths from 30 to 100 cm are sold; buy the shortest one that reaches so you are not stuffing loops of cable behind the head tube. The same 5-pin format is used by some throttles and lights, so double-check what the lead on your bike is actually feeding before you order.

Best for: Riders who raised the handlebars or changed stems · Cargo and long-tail conversions with long cable runs · Relocating the display to the center of the bar

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Connectors & Plugs

Julet Waterproof Connector Set, 2/3/4/5/6-Pin Pigtails (generic)

Julet (and the near-identical Higo) round waterproof connectors are the signal plugs used across kit bikes for throttles, brake sensors, PAS, displays and lights. A pigtail set gives you male and female leads with short wire tails in the common pin counts, so you can re-terminate a component that came with bare wires or splice in a matching plug after a connector breaks. They are not crimp-it-yourself connectors; you solder or crimp the wire tails to your component, then heat-shrink. Match the pin count and gender to the plug on the other side.

Best for: Re-plugging a throttle, brake or PAS lead with a broken connector · Adapting bare-wire components to a Julet harness · Kit builders keeping a selection on hand

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Quick finders

Jump straight to what fits your bike

Find a charger by battery voltage

The charger must match the pack: 36V → 42.0V, 48V → 54.6V, 52V → 58.8V output.

36V (1)48V (2)52V (1)

Find a battery by voltage

Match voltage first, then mount style and connector.

36V (1)48V (1)52V (1)

Find a controller by voltage

Controllers and displays are usually paired — confirm the protocol.

Find a tire by size

Size is printed on the sidewall (e.g. 20×4.0, 26×4.0, 27.5×2.4, 700×38c).

20x4 (1)26x4 (1)27.5 (1)700c (1)

Find a tube by size

Match the tire size and the valve type (Schrader vs Presta).

20x4 (1)26 (1)26x4 (1)700c (1)

Brake pads by brake type

Pad shape depends on the caliper model — check yours before ordering.

By connector / plug

XT60, Anderson, Julet/Higo, DC barrel, XLR…

julet (3)xlr-3-pin (2)dc-barrel-5.5x2.1 (1)dc-barrel (1)julet-3-pin (1)xt60 (1)anderson (1)

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E-Bike Parts by category

Grouped the way a shop is organized. Each category page has buying notes, compatibility tips and its own filters.

Electrical10 categories

E-Bike Batteries

Replacement and spare lithium packs — match voltage, mount and connector.

E-Bike Battery Chargers

Replacement chargers — voltage, amperage and plug type must match your pack.

E-Bike Controllers

The brain between battery, motor, throttle and display.

E-Bike Displays

LCD/LED displays and replacement screens matched to your controller protocol.

E-Bike Motors

Replacement hub and mid-drive motors and conversion kits.

Hub Motors

Front and rear geared/direct-drive hub motors and wheel kits.

Mid-Drive Components

Chainrings, kits and service parts for mid-drive systems.

Wiring Harnesses

Main cables and extension harnesses for display, throttle and brake sensors.

Connectors & Plugs

XT60/XT90, Anderson, Julet/Higo waterproof connectors and battery discharge plugs.

Replacement Screens

Screens and protective covers for common display models.

Controls2 categories

Throttles

Thumb and twist throttles — connector and voltage signal must match.

Pedal Assist Sensors

Cadence and torque sensors that tell the controller you are pedaling.

Brakes4 categories

E-Bike Brake Pads

Disc pads in the right shape and compound for heavier, faster e-bikes.

Brake Rotors

160/180/203 mm rotors — check mount type (6-bolt vs Centerlock).

Brake Levers

Mechanical and hydraulic levers, including e-bike levers with motor cut-off sensors.

Hydraulic Brake Components

Calipers, hoses, olives, bleed kits and mineral oil / DOT fluid.

Wheels & Tires5 categories

E-Bike Tires

E-bike rated tires with puncture protection in the common 20×4, 26×4, 27.5 and 700c sizes.

Inner Tubes

Schrader/Presta tubes, thorn-resistant and sealant-filled options.

Tubeless Components

Sealant, valves, rim tape and plugs for tubeless setups.

Wheels & Rims

Replacement wheels and rims, including motor-compatible dropout widths.

Spokes & Nipples

Spokes sized for hub-motor flanges and heavy e-bike loads.

Drivetrain6 categories

Cassettes

7–12 speed cassettes; freehub standard must match your wheel.

Freewheels

Thread-on freewheels common on hub-motor e-bikes (often 7-speed).

E-Bike Chains

E-bike rated chains with stronger plates; match your speed count.

Derailleurs

Rear derailleurs, hangers and shifters for common e-bike drivetrains.

Cranksets

Cranks, chainrings and bottom brackets — including PAS-compatible options.

Pedals

Flat, wide-platform and folding pedals with grip for commuting.

Cockpit & Comfort8 categories

E-Bike Lights

Headlights and taillights — battery-powered or wired to the main pack.

Fenders

Full-coverage and fat-tire fenders sized to your wheel and tire width.

Racks (Parts)

Front and rear rack hardware for commuter and cargo setups.

Kickstands

Heavy-duty single and double-leg stands rated for e-bike weight.

Seats & Saddles

Wide comfort saddles, suspension seats and replacement covers.

Seat Posts

Suspension and rigid posts — check diameter (27.2, 30.9, 31.6 mm).

Handlebars & Stems

Riser, swept-back and adjustable stems for a more upright fit.

Grips

Ergonomic and lock-on grips for numb-hand relief.

Buyer guides

Common problems