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Tire Size Comparison Chart

With the tire size selection feature for classic trainers, you have the option to get even more accurate power readings based on your tire size. You will see the tire size selection menu at the top of the search menu for a speed sensor.

 

TireSize.png

 

We've included a chart below comparing various tire sizes. If yours isn't listed in game, find your tire size in the list below (find and use the ETRTO size, if possible) and choose the listed Zwift size in your pairing screen.

If your tire size is below 20" or above 27x1 1/4, it's not going to be supported under zPower at this time.

ETRTO

Tire Size

Labeled Tire Size Outside Tire Diameter (mm) Zwift Size
32-406 20x1.25 1450 20"
35-406 20x1.35 1460 20"
40-406 20x1.50 1490 20"
47-406 20x1.75 1515 20"
50-406 20x1.95 1565 20"
28-451 20x1-1/8 1545 20"
37-451 20x1-3/8 1615 20"
37-501 22x1-3/8 1770 24x1.75
40-501 22x1-1/2 1785 24x1.75
54-507 24x2.125 1965 24x2
28-540 24x1-1/8 1795 24x1.75
32-540 24x1-1/4 1905 24x2
25-559 26x1 1913 26x1.5
32-559 26x1.25 1950 26x1.5
37-559 26x1.40 2005 26x1.5
47-559 26x1.75 2023 26x1.5
50-559 26x1.95 2050 26x2
54-559 26x2.10 2068 26x2
57-559 26x2.125 2070 26x2
58-559 26x2.35 2083 26x2
75-559 26x3.00 2170 26x2
20-571 650x20C 1938 650C
23-571 650x23C 1944 650C
25-571 650x25C 26x1 1952 650C
40-584 650x38B 2105 700x25c
25-630 27x1 2145 27x1.25
28-630 27x1-1/8 2155 27x1.25
37-630 27x1-3/8 2169 27x1.25
40-584 27.5x1.50 2079 700x20c
50-584 27.5x1.95 2090 700x20c
54-584 27.5x2.1 2148 700x32c
18-622 700x18C 2070 700x20C
19-622 700x19C 2080 700x20C
30-622 700x32C 2155 700x32C
35-622 700x35C 2168 27x1.25
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