Frequently asked questions
This page collects common questions about TubeWitch accuracy, Garmin bicycle tire pressure monitoring, Quarq TyreWiz compatibility, Zipp 303 SW support, pressure alarms, sensor IDs, stale indicators, and activity recording.
Garmin does not support TyreWiz sensors natively, so showing TyreWiz pressure on a Garmin requires a Garmin Connect IQ data field.
TubeWitch provides that capability as a Garmin Connect IQ tire pressure monitoring data field for compatible Quarq TyreWiz sensors and Zipp 303 SW wheels with the integrated Zipp AXS Wheel Sensor.
Yes. It matches the SRAM AXS mobile app exactly.
More sensors coming soon...
Yes.
"?" indicates the sensor is not delivering data and TubeWitch is trying to reconnect.
"X" indicates TubeWitch timed out for that sensor and stopped searching to save battery. Default timeout is 15 minutes.
Use the SRAM AXS mobile app. That is where you set the target pressure and alert range for each TyreWiz sensor.
TyreWiz stores that behavior in the sensor itself, so the TyreWiz LED and TubeWitch stay in sync. Slow green flashing means tire pressure is within the suggested range. Slow red flashing means low tire pressure is detected. Fast red flashing means high tire pressure is detected.
TubeWitch follows that same sensor status on Garmin. The SRAM AXS app is also where firmware updates are managed and where SRAM provides pressure guidance to help you choose a starting point for your tires.
First check the SRAM AXS mobile app. That is where the target pressure and alert range are defined for each TyreWiz sensor, and TubeWitch follows that same sensor status.
Because those settings are stored in the sensor, TubeWitch stays in sync with the TyreWiz LED behavior: slow green flashing means pressure is within range, slow red flashing means low pressure is detected, and fast red flashing means high pressure is detected.
If TubeWitch is showing live pressure but the high or low status seems wrong, the most common cause is that the target pressure or alert range in SRAM AXS does not match the setup you expect. Also confirm that the correct sensor IDs are entered in TubeWitch.
Those are alternate spellings riders use in search. Tube Witch, TyreWitch, and TireWitch refer to the TubeWitch data field.
Tyre Wiz, TireWiz, and Tire Wiz refer to the SRAM/Quarq tire pressure sensors. TubeWitch is the Garmin Connect IQ data field that brings TyreWiz pressure and alerts to compatible Garmin devices.
Yes. Save up to five named bikes or wheel sets.
Then either manually select the active sensor set in settings, choose Auto to scan each configured sensor set for 10 seconds, or use the Touch to Switch feature. Only one sensor set can be connected and displayed at a time.
Yes. It can record pressure from the active sensor set, alarms, and more.
The average pressures and the sensor set name are also shown in the Garmin Connect IQ stats.
No. TubeWitch can keep watch in the background, so popup and audible alerts still work without keeping the data field on screen.
You can switch to another page and leave your map or preferred screen up until an alert appears.
Yes. TubeWitch adds audible, pop-up, and vibration alerts; customizable labels and colors; stale-data indicators that keep showing the last known pressure after a disconnect; support for multiple bikes and wheel sets; more layout options; support for newer Edge devices and Garmin watches; touchscreen features; and sensor timeouts that save battery.
Yes, in TubeWitch settings, open the Sensor Set and find the Enabled Sensors setting. Change it to Front or Rear only.
The data field will then show only a single pressure.
SRAM has not updated their TyreWiz Data Field for newer Garmin devices or added new features in quite some time.
TubeWitch fills that gap.
For a single-page product overview aimed at SRAM/Quarq TyreWiz Garmin searches, see SRAM/Quarq TyreWiz on Garmin.
ALERT: SAVING SETTINGS WITH THE CONNECT IQ MOBILE APP IS AFFECTED BY A BUG IN THE GARMIN IQ SYSTEM. MAKE SURE THE TUBEWITCH DATA FIELD IS VISIBLE ON YOUR GARMIN DEVICE WHEN CHANGING SETTINGS. IF SETTINGS STILL DO NOT SAVE, TRY GARMIN EXPRESS. VIEW CURRENT WORKAROUND
Even when Garmin is working normally, the steps below can help if settings do not save reliably.
First, make sure the 
TubeWitch data field is visible on your Garmin device before changing settings in the Connect IQ app.
If sensor IDs or other settings are not being saved by the Garmin Connect IQ mobile app, try entering one sensor ID first and saving immediately before entering the second. Garmin's save process can be inconsistent when many settings are changed at once.
Use Garmin Express for the most reliable way to save settings.
The sensor ID fields are restricted to numbers only.
Only the numeric part of the sensor ID is required in settings. For example, if the sensor ID is HGL12345, enter 12345.
TubeWitch is compatible with most newer Garmin devices and watches released in 2018 or later. As new Garmin devices are released each year, TubeWitch will be updated as soon as possible to include them.
See the TubeWitch App Store page for the most up-to-date list of compatible devices: Compatible Garmin Devices
To request support for a newly released device, use the Contact Developer link from the TubeWitch page in the Garmin Connect IQ mobile app.
They are printed on the sensor and can also be found in the SRAM AXS mobile app.
See screenshot:
Use Garmin's in-app Contact Developer link to contact TubeWitch support.
Use the Garmin Connect IQ mobile app.
Open the TubeWitch Garmin App Store page, tap Open in App, scroll to the bottom of the TubeWitch app page, then tap Contact Developer.
Include your email address to receive a reply.
