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Setting the Bike Wheel Size on a Garmin Fitness Device

Your bike's wheel size is automatically calculated over time when a Speed Sensor 2 or similar sensor is connected to a fitness device and used outdoors. In certain circumstances, such as when doing an indoor activity or when speed and distance readings are inaccurate, wheel size can be entered manually for improved accuracy on devices that allow this function. If you know your wheel size, select your device below and follow the steps to enter this measurement.

NOTE: Sensors have to be actively connected to the device to manually enter wheel size

Tire and Wheel Size Information

The tire size is marked on both sides of the tire and can be used to determine the circumference of the wheel in millimeters (mm). This is not a comprehensive list. You can also measure the circumference of your wheel or use one of the many calculators available on the internet.

Tire Size	Wheel Circumference (mm)
20 × 1.75	1515
20 × 1-3/8	1615
22 × 1-3/8	1770
22 × 1-1/2	1785
24 × 1	1753
24 × 3/4 Tubular	1785
24 × 1-1/8	1795
24 × 1.75	1890
24 × 1-1/4	1905
24 × 2.00	1925
24 × 2.125	1965
26 × 7/8	1920
26 × 1-1.0	1913
26 × 1	1952
26 × 1.25	1953
26 × 1-1/8	1970
26 × 1.40	2005
26 × 1.50	2010
26 × 1.75	2023
26 × 1.95	2050
26 × 2.00	2055
26 × 1-3/8	2068
26 × 2.10	2068
26 × 2.125	2070
26 × 2.35	2083
26 × 1-1/2	2100
26 × 3.00	2170
27 × 1	2145
27 × 1-1/8	2155
27 × 1-1/4	2161
27 × 1-3/8	2169
29 x 2.1	2288
29 x 2.2	2298
29 x 2.3	2326
650 x 20C	1938
650 x 23C	1944
650 × 35A	2090
650 × 38B	2105
650 × 38A	2125
700 × 18C	2070
700 × 19C	2080
700 × 20C	2086
700 × 23C	2096
700 × 25C	2105
700C Tubular	2130
700 × 28C	2136
700 × 30C	2146
700 × 32C	2155
700 × 35C	2168
700 × 38C	2180
700 × 40C	2200
700 × 44C	2235
700 × 45C	2242
700 × 47C	2268

D2 Mach 1, Enduro, epix (Gen 2) Series, fenix 6 Series, fenix 7 Series, MARQ Collection, tactix 7 Series, tactix Delta Series

Press and hold MENU.
Select Sensors & Accessories.
Select Speed Sensor (Spd. -xxxxxxx).
Select Wheel Size.
Select Manual.
Enter Wheel Size in millimeters (mm).

Forerunner 230, 235, 630, and 735XT

If locked, unlock the screen.
Press the Run key (top right).
Navigate to Menu or select:
- Forerunner 630: select.
Select Settings.
Select Sensors and Accessories.
Select Speed sensor.
Select Wheel Size.
Select Manual.
Enter in Wheel Size in millimeters (mm).

Forerunner 920XT

Press Shortcut key (three dots on bottom left).
Press ENTER to unlock screen.
Press Shortcut key.
Select Settings.
Select Sensors and Accessories.
Select Spd/Cad or Spd.
Select Wheel Size.
Select Manual.
Enter in Wheel Size in millimeters (mm).

Forerunner 245 Series, 255 Series, 645 Series, 745, 935, 945, 945 LTE, 955, and 955 Solar

Press and hold the Up/Menu Key.
Access the settings option on the watch.
Select Sensors & Accessories.
Choose your previously paired speed sensor.
Select Wheel Size.
Select Manual.
Enter in Wheel Size in millimeters (mm).

Edge 130 Series, 520 Series, 530, 820, 830, 1000, 1030 Series, and Explore Series

Select Menu or .
Select Settings (some devices skip this step).
Select Sensors.
Select the previously paired speed sensor.
Select Sensor Details.
Select Wheel Size.
Select Manual.
Enter in wheel size in millimeters (mm).

Instinct Series, fenix 5 Series, fenix 5 Plus Series

Press and hold MENU.
Select Settings or scroll down.
Select Sensors & Accessories.
Select Speed Sensor (Spd. -xxxxxxx).
Select Wheel Size.
Select Manual.
Enter Wheel Size in millimeters (mm).

Instinct 2 Series

Press and hold MENU.
Select Sensors & Accessories.
Select Speed Sensor (Spd. -xxxxxxx).
Select Wheel Size.
Select Manual.
Enter Wheel Size in millimeters (mm).

Speed Sensor 2 Via the Garmin Connect App

From the Garmin Connect app access the menu.
- Android: (upper left)
- iOS: Menu (lower right).
Select Garmin Devices.
Select Speed Sensor 2.
Select General Settings.
Select Wheel Size.
Enter in Wheel Size in millimeters (mm).

For all other fitness devices, refer to your owner's manual.