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FAQs

  • How do I measure the wheel circumference?

    1. Align the valve on the front wheel so that it is precisely vertical to the ground. 
    2. Mark this point on the ground with a line (e.g. using chalk).
    3. Push the bike one wheel rotation forward until the valve is again vertical to the ground.
    4. Mark this point on the ground as well.
    5. Measure the distance between the two marks. That is your wheel circumference.
    6. Enter the wheel circumference into your VDO computer.

  • Altitude settings tip (start altitude)

    When using a VDO computer with altitude measurement for the first time, you can set two different start altitudes. The start altitude is the altitude at your home or the place from which you start your trips. The second start altitude can be that of a holiday location. You can find the altitude information on a map or look it up online.

  • Altitude settings tip (recalibration)

    Recalibration is used to re-align the currently measured air pressure with the start altitude that has been configured. This process must be conducted before every trip. As the air pressure can have changed due to the weather, recalibration must be used to re-align the new air pressure with the unchanged start altitude. Only if you recalibrate the device will you be shown the correct start altitude and the current current altitude during your trip.

  • How can the transmitter be set to bike 2?

    The M, MC 2.0WL and X-DW series come with automatic bike recognition (recognition of whether bike 1 or bike 2 is being ridden). For this function to work, we recommend using the following procedure:

    1. Remove the battery from the transmitter.

    2. Set the bike switch in the transmitter or on the outside of the transmitter housing to ‘Bike2’.

    3. Insert the battery the wrong way round (this deletes the transmitter encoding memory).

    4. Now insert the battery the correct way round (plus pole pointing up).

    5. Close the battery compartment.

  • Finding the start altitude

    If you do not know your start altitude, this website may assist you: www.daeb.de..

    This provides altitude information for almost all towns and cities in Germany.

  • Can I change the battery in the transmitter chest belt myself?

    Users can change the battery in all VDO chest belts themselves.

    Battery = 3V, type 2032

  • Wireless model attachment tip: is the transmitter attached below the brake?

    Do not attach the transmitter directly below a cantilever brake, e.g. a Magura hydraulic brake. The metal casing of the cantilever brake diverts the wireless signal, potentially preventing it from reaching the computer.

    The gap between the transmitter and the cantilever brake or Magura hydraulic brake should be at least 10 cm.

    On mountain bikes with disc brakes, the transmitter can be attached a few centimetres above the brake disc. On road bikes, the transmitter should be attached to the lower third of the fork leg.

  • Wireless model attachment tip: what is the wireless range of the computers?

    The ranges depend on the model series and the wireless frequency used.

    M-series:

    wireless range for speed 0.75 m, cadence 0.90 m, heart rate 0.75 m

    MC 2.0 WL:

    wireless range for speed 0.75 m and cadence 0.90 m

    In the Z-series, the wireless range is approx. 1.20 m for the speed and the cadence.

    X-DW-series:

    wireless range for speed approx. 0.75 m and for cadence approx. 0.90 m

    For the A4+ and A8+ series, approx. 0.60 m to 0.75 m for speed.

  • Wireless model attachment tip: what sources of interference are there?

    Please do not attach the computer in direct proximity to a mobile phone, GPS device or halogen or LED bulb. The mobile phone transmits position signals, which can interfere with the wireless tachometer’s receiving performance.

    In the case of the GPS device, the GPS receiver interferes with the wireless tachometer’s wireless transmission. In the case of halogen or LED bulbs, the electronics create a magnetic field, which can also influence the wireless tachometer’s wireless transmission.

  • Wireless model attachment tip: how does the magnet have to be attached?

    It is important that the magnet passes a particular position on the transmitter housing (the point where the pulse electronics are installed).

    A small sensor mark can be found on the transmitter. Attach the transmitter so that this sensor mark is pointing at the spokes. Attach the magnet so that the middle of its surface is aligned with this mark. If the magnet is attached higher or lower, this can lead to ‘jumping’ or ‘duplicated’ speed data.

    Push the transmitter onto the fork or the magnet onto the spoke until the precise position has been achieved. The magnet must pass the transmitter at a distance of 5-10 mm.

    If the gap is bigger than this, the incorrect speed can be displayed when moving at faster speeds.

  • Wireless model attachment tip: where should the transmitter be attached? Right or left?

    The computer can be attached to the right, left or stem. If attached to the right of the handlebars, the transmitter must also be attached to the right of the fork.

    If the computer is attached to the stem or the left of the handlebars, the transmitter MUST be attached on the left.

  • Altitude settings tip (current altitude)

    While on trips, there are always two things that can influence the air pressure measured and therefore the current altitude displayed:


    1. Your altitude gain/loss.

    2. Changes to the air pressure due to changes in weather during the trip.


    The influence of the change in weather can lead to the current altitude displayed differing from the altitude shown on a sign, e.g. at a mountain lodge. For the current altitude to be correctly displayed again, you can re-adjust the current altitude on all VDO models with an altitude measurement function. If you do not re-adjust this during your trip, the current altitude displayed on returning home may differ from the start altitude you have configured. Reason: changes in weather during your trip.

  • Which models can be retrofitted with a wireless cadence function?

    Only models M3.1 WL, M 4.1 WL, M5, M6, M6.1 and MC2.0WL can be retrofitted with a wireless cadence function.

  • Can weather-induced changes to the air pressure affect the trip and annual altitude gain/loss recorded?

    Changes to the air pressure are only processed as trip altitude gain/loss if the change in air pressure is measured at the same time as speed stimuli, i.e. if you are riding.
    If no speed stimuli are measured (e.g. when hiking), changes to the air pressure are displayed as changes to the current altitude but not processed as trip or annual altitude gains/losses.