ZPIDER user manual

The information in this manual is subject to change without notice. We reserve the right to change and improve the product and manual without obligation to inform about changes.

You are encouraged to visit the website for updates and supplementary information concerning use and operation of this product.

A.    Specifications

  • Battery: Lithium Ion rechargeable, not-replaceable
  • Battery charging: Using standard 500mA Micro-USB phone charger and included CHARGER pod
  • Wireless transmission: 2.4GHz, ANT+™ and Bluetooth® Smart (4.0)
  • Accuracy: +/-2% of measured power
  • Power measurement range: (watts): 0 – 1999
  • Cadence range (RPM): 30-200
  • Water resistance rating: IPX7

Water resistance notice

The product is designed to provide excellent water resistance and tested to resist water ingress to the IPX7 standard (up to 1 meter). This provides outstanding water resistance for cycling conditions both off-road and on-road­, including stream crossing and heavy rain. Please keep in mind this is an electronic device inherently sensitive to water. There are limits to the water resistance. Do not subject the product to direct spray from a high pressure sprayer. It is possible for water to be forced past the seals and damage to the electronics may occur. 

Battery notice

The product contains a Li-Ion battery. Do not try to replace the battery.

B.     Installation

Please refer to the first time installation guide.

C.    Charging

For charging use a standard Micro-USB phone charger. These are widely available and should be rated minimum 500mA (most common).

  • Connect the phone charger to the small CHARGER pod and observe the light turning green
  • Wipe clean the gold plated charging contact points in the ZPIDER
  • Snap the CHARGER pod onto the charging points on the ZPIDER crank. The magnets should hold the CHARGER pod in place
  • Observe the light turns red to indicate charging and leave it to fully charge as indicated by the light turning green


The green light indicates no charging, which may also happen if the connection between the CHARGER pod and the power meter.

If making contact between the CHARGER pod and the ZPIDER is difficult, consider cleaning the gold plated charging contact points and make sure the two spring loaded pogo-pins on the CHARGER pod can move freely.

Deep Discharge Warning:

If leaving the power meter unused for longer periods, make sure to maintain at least 40% charge on the battery by charging the battery from time to time. This avoids risking the battery going into a deep discharge state which will require an expensive repair (not covered by warranty).

D.    Turn on the Power Meter

In order to conserve power, the power meter will automatically turn off after 5 minutes of no crank rotations. To turn on the power meter, simply turn the crank 1-2 rotations either way with the bike in the upright position.


The power meter may also be turned on by connecting the CHARGING pod for 30 seconds and then disconnecting the CHARGING pod. This procedure will also reset the power meter, which may be required in case an unexpected lockup/hang/freeze/crash should occur.

The power meter is always turned off while the CHARGING pod is connected.

E.     Pairing

Using ANT+ on Bike Computer or Smartphone

Connect the power meter with any device that is ANT+ compatible and supporting the PWR profile (most bike computers and certain types of smartphones).

Pairing can be done automatically by searching for power meters nearby – this may not work well if other power meters are located nearby. The recommended method for Garmin bike computers is to do this once far away from other ANT+ devices and read off the ANT ID number (up to 5 digits). Then enter this value manually in the ANT+ device (bike computer or smart phone)

Using BLE on Smartphone

Turn on Bluetooth (and for some versions of Android, also turn on location) on the smartphone. Use the app to search for devices. The ZPIDER will show up with a name of the form ZW72-xxxxx (here xxxxx can be any number up to 5 digits, and is the same number used as ANT+ ID number).

F.     Calibration / Zeroing

Calibration is done to set the zero offset of the highly sensitive torque measurement. There is no need to calibrate the power meter for every ride. Calibration is recommended after any mechanical changes to the crank such as changing chain rings, installation of the crank, tightening of bolts etc.

F.1     Calibration Process

  • Turn on the power meter.
  • Place the bike in the upright. Do not put any weight on the pedals.
  • Using an ANT+ bike computer, follow the instructions for the bike computer to send the CALIBRATE command. Typically under Settings/Bike Settings/Bike Profiles/Bike/ANT+ Power
  • Using a smartphone connected through BLE, use the Team ZWATT app and select Calibrate in the menu.

G.    Training Use

After pairing the power meter to the bike computer or smartphone of your choice, the following fields of data should be available:


The power measured as the effort by both legs. This is a very accurate way to measure pedaling power.


Cadence is measured by built-in accelerometers (no magnets) in RPM (revolutions per minute).

Pedal Smoothness

The ratio between total torque and maximum torque delivered in a single crank rotation. This value increases when the torque throughout the entire crank revolution gets more equal.

H.    Maintenance

As a minimum it is recommended to inspect the product for damage including cracks, dents, and serious scratches after all rides and after transport.

Check bolts etc. for correct torque on a regular basis.

I.      Inside the Power Meter

Taking the power meter apart will almost certainly damage it – and will void the warranty. Also the calibration will have to be repeated at the factory.

There are no repairable or replaceable parts inside and no spare parts are made available.

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