Home › Display settings › Specialized Turbo (TCU, TCD, Mastermind TCU/TCD) + Mission Control / Specialized app › Specialized Turbo: switch mph to km/h

Change units (mph to km/h) on a Specialized Turbo with TCU, TCD or Mastermind TCU/TCD

Specialized Turbo (TCU, TCD, Mastermind TCU/TCD) + Mission Control / Specialized app

On a TCD or Mastermind display the unit is a display setting; on a plain TCU (LED bar in the top tube) there is nothing to set on the bike and units are an app setting.

Step by step

  1. Mastermind TCU/TCD: from the ride screen hold the remote's S button (or long-press the display button) to open Settings, choose [Units], pick Metric, confirm.
  2. TCD (2019-2021 mono display): hold the TCD's lower button for two seconds to open settings, step to Units, toggle to km/h, confirm.
  3. Plain TCU: Open the Mission Control app (or the Specialized app on 2022+ Mastermind bikes), switch the bike on and connect (see the pairing guide). Open Settings > Units > Metric.
  4. Restart the bike and check the speed shown.
  5. Mission Control and the display store units separately on older firmware; set both.
Tip: Imported US bike showing 20 mph cut-off: changing units does not change the limit. That is a region setting the dealer can only change with proof the bike is registered in the EU.

Can't find it?

No Units item on a Mastermind: firmware too old. Update through the app, then it appears.

Frequently asked

Does km/h vs mph change the assist cut-off?

No. Region (EU 25 km/h, US 20/28 mph) is separate and dealer-set.

Which display do I have?

TCU: LEDs in the top tube, no screen. TCD: small mono bar display. Mastermind TCU: colour screen in the top tube (2021+). Mastermind TCD: colour bar display.

Do I need the app for a Mastermind?

No, the display has the setting.

Manuals and video

Videos found on YouTube and checked automatically; they are other people's work, not ours.

Other Specialized Turbo (TCU, TCD, Mastermind TCU/TCD) + Mission Control / Specialized app guides

Specialized Turbo: reset trip distanceSpecialized Turbo: wheel size (dealer only)Specialized Mission Control: tune assist (Support / Peak Power)Specialized Turbo: System LockSpecialized Turbo: pair with Mission Control / Specialized appSpecialized Turbo: firmware update (app vs dealer)Specialized Turbo: walk assistSpecialized Turbo: lights on/off
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.