Article

🛠️ Front-Hub Kit Install — Step by Step

The front-hub kit is the easiest Bafang install: no bottom-bracket work, you keep your cranks and shifting, and most riders are done in one to two hours. Just don't skip the torque arm.

July 12, 20264 min read

🛠️ Front-Hub Kit Install — Step by Step

Why a front-hub torque arm is not optional, by fork material Complete Bafang 500W front hub motor kit and battery

A front-hub kit is the easiest Bafang install: no bottom-bracket surgery, you keep your cranks and shifting, and it's usually done in 1–2 hours. The whole job is swapping the front wheel and wiring the controls. The one thing you must not skip is the torque arm — read Step 4 carefully.

Before you begin

Before you begin: confirm your fork has open/slotted dropouts at least 10mm wide and standard ~100mm spacing. The FMG020 front hub is 48V only.

Mount the front wheel

⚠️ Heads up: on an aluminum or carbon fork, a torque arm is REQUIRED (see Step 4) — skipping it can split the dropout and cause a crash.

  • Prep the wheel. Your kit comes as a pre-built motor wheel (12ga spokes, tire pre-mounted on most kits). If you're reusing your own tire/tube, move the rim tape, tube, and tire onto the motor wheel now. Set your tire pressure.
  • Remove the old front wheel. Flip the quick-release or undo the axle nuts and drop the stock wheel out. Set your old rim tape/tube aside if you're not reusing the tire.
  • Seat the motor wheel in the dropouts. Drop the flatted axle fully into the fork dropouts so the flats seat flat against the dropout slots. Orient the wheel so the motor cable exits downward and slightly rearward, and make sure the disc rotor (if you run one) lines up with the caliper. Add the tabbed/serrated torque washers into the dropout slots — the tabs bite into the fork and resist axle spin.
  • Install the torque arm(s) — do not skip this. A front-hub motor tries to spin its own axle inside the dropout under power. On an aluminum or carbon fork this can split the dropout and cause a serious crash — that's the classic front-hub catastrophic failure.
- Aluminum or carbon fork: a proper torque arm is required. Bolt it to the axle so it braces against the fork leg or a solid anchor point. - Any fork at 500W: use at least one torque arm regardless of material. Cheap insurance. - Steel fork at low power can get by on torque washers alone, but a torque arm is still smart. When in doubt, use one.
  • Torque the axle nuts. Tighten the axle nuts firmly and evenly to about 35–40 Nm — snug, with the flats and washers fully seated. Confirm the wheel spins true and centered and the brake works.

Wire the controls

  • Leave a cable drip-loop. Route the motor cable up the fork with a downward drip loop before it reaches the connector, so water runs off instead of into the plug. Zip-tie it to the fork or brake hose so it can't get caught in the spokes or rotor.
  • Mount the controls and controller. Install the display, thumb throttle, PAS sensor (front-hub kits include a PAS ring/disc for the crank — install per the kit's sensor type), and brake levers or cutoff sensors on the bars. The front-hub kit uses an external controller — mount it in a frame bag, on the bottle bosses, or wherever it stays ventilated, and drip-loop its connectors too.
  • Connect the Higo plugs (battery last). Match arrows/keyways and seat each plug fully — display, throttle, brakes, PAS, motor — then connect the battery last.

Power-on and check

  • Power-on test. Turn on the display, confirm no errors, set the wheel size, and with the wheel off the ground test throttle, PAS, and brake cutoff.
  • Check spokes after the first rides. Pre-built motor wheels often arrive with slightly uneven spoke tension. Re-check and re-true the wheel after your first few rides and re-check the axle nuts — hub-motor spokes and nuts both settle early on.
Supplement video: "Step by Step Bafang Front Hub Motor Kit Installation"

🎥 Watch the full install

Bafang Front Hub Motor Kit Installation (11:18)

▶ Watch on Livid: Bafang Front Hub Motor Kit Installation (11:18)

Was this article helpful?

Related Articles

🛑 Brake Cutoff (E-Brake) Sensor Install

Brake cutoff sensors kill motor power the instant you squeeze a lever, the safety net that makes Bafang's cadence PAS feel predictable. Here is how to fit and test them on every build.

🛠️ Classic Pain Points (Read This If You Get Stuck)

The handful of snags that stall most Bafang installs, distilled from ten years of support calls, with the field-tested fix for each so you can get unstuck fast.

🔦 Front LED Headlight (Optional Accessory)

The optional Bafang front LED headlight wires off the display's low-voltage output and mounts to your fork crown or handlebar. Here is how to route the lead and mount it cleanly.

⚙️ Gear Shift Sensor Install

The gear shift sensor briefly cuts motor power each time you shift so the chain moves under no load, sparing your drivetrain. Optional on the BBS02 and strongly recommended on the BBSHD.

🛠️ Mid-Drive (BBS02 / BBSHD) Install — Step by Step

The complete walkthrough for installing a Bafang mid-drive, from bottom-bracket removal to the first power-on test. Work through it in order and take your time on the bottom bracket.

Back to Installation