How do I find the wheel size when manually calibrating the GSC 10?

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01/08/2013

Wheel size is automatically calculated when a Garmin Speed/Cadence Bike Sensor (GSC 10) is paired to a GPS-enabled device*. In certain circumstances, such as when doing an indoor activity or when using devices that do not have GPS capability, the GSC 10 will need to be calibrated manually by entering a custom wheel size within the bike profile to provide accurate speed and distance.

To find the correct wheel size:

  1. Look at Wheel Size Chart listed below
  2. Match tire size listed below to the size marked on bike’s tire (example 26 x 1.95)
  3. Manually enter tire size in mm (example 26 x 1.95 is 2050 mm)

Completing the manual calibration of the GSC 10 will provide increased accuracy for speed and distance.

*To find additional resources and information on this process:

  • Consult the owner's manual in the manual calibration process.
  • Consult a local bike dealer if unable to find your tire size in the chart.
  • Consult device product page/owner's manual as some devices do not support or fully support the GSC 10.

Referenced Links:

Speed/Cadence Bike Sensor - https://buy.garmin.com/shop/shop.do?pID=1266

Owner's Manual - https://support.garmin.com/support/manuals/searchManuals.faces?refresh=true

Wheel Size Chart -

Wheel SizeLength (mm)Wheel SizeLength (mm)
12 x 1.7593526 x 1.752023 
14 x 1.5102026 x 1.95 2050
14 x 1.75105526 x 2.00 2055
16 x 1.5118526 x 2.10 2068
16 x 1.75119526 x 2.125 2070
18 x 1.5 134026 x 2.35 2083
18 x 1.75 135026 x 3.002170 
20 x 1.75 151527 x 1 2145
20 x 1-⅜ 161527 x 1-⅛ 2155
22 x 1-⅜ 177027 x 1-¼ 2161
22 x 1-½ 178527 x 1-⅜ 2169
24 x ¾ tubular 1753650 x 35A 2090
24 x 1-⅛ 1785650 x 38A 2125
24 x 1-¼ 1795650 x 38B 2105
24 x 1.75 1905700 x 18C 2070
24 x 2.00 1890700 x 19C 2080
24 x 2.00 1925700 x 20C 2086
24 x 2.125 1965700 x 23C 2096
26 x ⅞ 1920700 x 25C 2105
26 x 1(59) 1913700 x 28C 2136
26 x 1(65)1952 700 x 30C 2170
26 x 1.25 1953700 x 32C 2155
26 x 1-⅛ 1970700C Tubular 2130
26 x 1-⅜ 2068 700 x 35C 2168
26 x 1-½ 2100700 x 38C 2180
26 x 1.40 2005700 x 40C 2200
26 x 1.50 2010  

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