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How-to guide

Set up a KT or Bafang display within your e-bike class

The basic settings to check after fitting a KT or Bafang display: true wheel size, units, assist levels and a speed limit within your e-bike class, with battery protection left alone.

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Time
15 to 30 minutes

This guide covers the basic display settings to check after you fit a new KT or Bafang display or controller: the real wheel size, units, assist levels and a speed limit inside your e-bike's class. It's the everyday setup a rider can do from the handlebar, not tuning for more speed or power.

Make these changes with the bike parked. Leave battery protection settings, such as the low voltage cutoff, at the values your controller or kit maker gives, and never raise current above the controller's or motor's rating. If a setting asks for a password you don't know, ask the seller or a shop.

Know your class first

Class 1 bikes are pedal assist only up to 20 mph, Class 2 bikes add a throttle up to 20 mph, and Class 3 bikes are pedal assist up to 28 mph. Makers put a sticker on the frame that shows the class (Bosch, three class system). For reference, 20 mph is about 32 km/h and 28 mph is about 45 km/h.

Going past your e-bike class limits can make the bike illegal on public roads and bike paths in many places, voids the warranty, and adds wear on the battery, motor and brakes. A bike set up as Class 3 needs a Class 3 label.

Options

KT-LCD3 and similar KT displays (easy)

The KT-LCD3 manual from Kunteng describes the menus (KT-LCD3 manual):

  1. Power on, then within 5 seconds hold the up and down buttons together for about 2 seconds. The first screen is the maximum speed setting, then wheel diameter, then units.
  2. Speed limit: set it within your class. The manual's default is 25 km/h, and the motor stops driving above the set speed.
  3. Wheel diameter: pick the true size of the tire on your bike from the list, which runs from 6 inch to 28 inch and includes 700c. Never pick a wrong size to change the speed reading.
  4. Units: choose km/h or mph.
  5. Short press the power button to save each item and move on, and long press it to leave.

Other KT settings to know about:

  • C3 sets the assist level the bike starts in.
  • C5 trims the controller's maximum current, with 10 meaning full rated current. Leave it at or below that.
  • C7 turns cruise on or off.
  • C12 adjusts the low voltage cutoff. Leave it at the default, because it protects the battery.
  • P1 and P2 must match your motor, so use the kit maker's values.
  • C10 restores factory defaults if a change goes wrong.

Area 13 E-Bikes says its KT-LCD8H color display works wherever the KT-LCD3 does, but check its own manual, since menus can differ.

Bafang CAN bus displays (easy)

Bafang's DP C18 CAN bus manual and [DP C080 manual](https://www.bafang-e.com/Uploaded/Labels/BF-UM-C-DP C080.CB-EN.pdf) let the rider set units, brightness and auto off, and the DP C18 offers 3, 5 or 9 assist levels. Wheel size and speed limit are shown under Information as view only. Check both: the wheel size should match your tire and the speed limit your class. If either is wrong, a Bafang dealer sets it.

Bafang UART displays (easy to moderate)

Menus on UART displays vary by model, so use the manual for your display. The same rules apply: the true wheel size, your units and a speed limit within your class.

After setup

Videos

E-Bike Tips. Programming the KT-LCD3 controller computer from AUGUSTINE E-BIKE LIFESTYLE: a walk through the KT-LCD3 menus.
KT LCD3 Programming, works with LCD5 / LCD8 from Electric Bike Laboratory: the KT-LCD3 settings screens on a conversion kit.
Which Bafang DP C18 do you have? from GreenBikeKit: telling Bafang display versions apart.

When to get a pro

Ask a shop or the seller if the display asks for a password, the speed reading stays wrong after you set the true wheel size, or the motor cuts out or surges after a change. See When to call a pro.

Sources

Stuck after these checks? Find a shop near you.

Need a pro?

If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.

Talk

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