Type a chainring and cog. Everything updates as you type.
Set the speed you want and the cadence you want to turn. The tool returns the gears that put you there.
Tap a gear to load it into the calculator and chart.
This tells you what gear turns a given cadence. It can't tell you what your optimal cadence is. Factors can.
| Ring \ Cog | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 80 | 240.0 | 216.0 | 196.4 | 180.0 | 166.2 | 154.3 | 144.0 | 135.0 | 127.1 | 120.0 | 113.7 | 108.0 |
| 79 | 237.0 | 213.3 | 193.9 | 177.8 | 164.1 | 152.4 | 142.2 | 133.3 | 125.5 | 118.5 | 112.3 | 106.7 |
| 78 | 234.0 | 210.6 | 191.5 | 175.5 | 162.0 | 150.4 | 140.4 | 131.6 | 123.9 | 117.0 | 110.8 | 105.3 |
| 77 | 231.0 | 207.9 | 189.0 | 173.2 | 159.9 | 148.5 | 138.6 | 129.9 | 122.3 | 115.5 | 109.4 | 104.0 |
| 76 | 228.0 | 205.2 | 186.5 | 171.0 | 157.8 | 146.6 | 136.8 | 128.2 | 120.7 | 114.0 | 108.0 | 102.6 |
| 75 | 225.0 | 202.5 | 184.1 | 168.8 | 155.8 | 144.6 | 135.0 | 126.6 | 119.1 | 112.5 | 106.6 | 101.2 |
| 74 | 222.0 | 199.8 | 181.6 | 166.5 | 153.7 | 142.7 | 133.2 | 124.9 | 117.5 | 111.0 | 105.2 | 99.9 |
| 73 | 219.0 | 197.1 | 179.2 | 164.2 | 151.6 | 140.8 | 131.4 | 123.2 | 115.9 | 109.5 | 103.7 | 98.5 |
| 72 | 216.0 | 194.4 | 176.7 | 162.0 | 149.5 | 138.9 | 129.6 | 121.5 | 114.4 | 108.0 | 102.3 | 97.2 |
| 71 | 213.0 | 191.7 | 174.3 | 159.8 | 147.5 | 136.9 | 127.8 | 119.8 | 112.8 | 106.5 | 100.9 | 95.8 |
| 70 | 210.0 | 189.0 | 171.8 | 157.5 | 145.4 | 135.0 | 126.0 | 118.1 | 111.2 | 105.0 | 99.5 | 94.5 |
| 69 | 207.0 | 186.3 | 169.4 | 155.2 | 143.3 | 133.1 | 124.2 | 116.4 | 109.6 | 103.5 | 98.1 | 93.2 |
| 68 | 204.0 | 183.6 | 166.9 | 153.0 | 141.2 | 131.1 | 122.4 | 114.8 | 108.0 | 102.0 | 96.6 | 91.8 |
| 67 | 201.0 | 180.9 | 164.5 | 150.8 | 139.2 | 129.2 | 120.6 | 113.1 | 106.4 | 100.5 | 95.2 | 90.5 |
| 66 | 198.0 | 178.2 | 162.0 | 148.5 | 137.1 | 127.3 | 118.8 | 111.4 | 104.8 | 99.0 | 93.8 | 89.1 |
| 65 | 195.0 | 175.5 | 159.5 | 146.2 | 135.0 | 125.4 | 117.0 | 109.7 | 103.2 | 97.5 | 92.4 | 87.8 |
| 64 | 192.0 | 172.8 | 157.1 | 144.0 | 132.9 | 123.4 | 115.2 | 108.0 | 101.6 | 96.0 | 90.9 | 86.4 |
| 63 | 189.0 | 170.1 | 154.6 | 141.8 | 130.8 | 121.5 | 113.4 | 106.3 | 100.1 | 94.5 | 89.5 | 85.0 |
| 62 | 186.0 | 167.4 | 152.2 | 139.5 | 128.8 | 119.6 | 111.6 | 104.6 | 98.5 | 93.0 | 88.1 | 83.7 |
| 61 | 183.0 | 164.7 | 149.7 | 137.2 | 126.7 | 117.6 | 109.8 | 102.9 | 96.9 | 91.5 | 86.7 | 82.3 |
| 60 | 180.0 | 162.0 | 147.3 | 135.0 | 124.6 | 115.7 | 108.0 | 101.2 | 95.3 | 90.0 | 85.3 | 81.0 |
| 59 | 177.0 | 159.3 | 144.8 | 132.8 | 122.5 | 113.8 | 106.2 | 99.6 | 93.7 | 88.5 | 83.8 | 79.7 |
| 58 | 174.0 | 156.6 | 142.4 | 130.5 | 120.5 | 111.9 | 104.4 | 97.9 | 92.1 | 87.0 | 82.4 | 78.3 |
| 57 | 171.0 | 153.9 | 139.9 | 128.2 | 118.4 | 109.9 | 102.6 | 96.2 | 90.5 | 85.5 | 81.0 | 77.0 |
| 56 | 168.0 | 151.2 | 137.5 | 126.0 | 116.3 | 108.0 | 100.8 | 94.5 | 88.9 | 84.0 | 79.6 | 75.6 |
| 55 | 165.0 | 148.5 | 135.0 | 123.7 | 114.2 | 106.1 | 99.0 | 92.8 | 87.4 | 82.5 | 78.2 | 74.2 |
| 54 | 162.0 | 145.8 | 132.5 | 121.5 | 112.2 | 104.1 | 97.2 | 91.1 | 85.8 | 81.0 | 76.7 | 72.9 |
| 53 | 159.0 | 143.1 | 130.1 | 119.3 | 110.1 | 102.2 | 95.4 | 89.4 | 84.2 | 79.5 | 75.3 | 71.5 |
| 52 | 156.0 | 140.4 | 127.6 | 117.0 | 108.0 | 100.3 | 93.6 | 87.8 | 82.6 | 78.0 | 73.9 | 70.2 |
| 51 | 153.0 | 137.7 | 125.2 | 114.8 | 105.9 | 98.4 | 91.8 | 86.1 | 81.0 | 76.5 | 72.5 | 68.8 |
| 50 | 150.0 | 135.0 | 122.7 | 112.5 | 103.8 | 96.4 | 90.0 | 84.4 | 79.4 | 75.0 | 71.1 | 67.5 |
The chart shows you every gear. Factors knows which one suits you best.
Enter speed, split time or cadence at each point. The tool solves the rest and shows how the effort distributes.
You can dictate times without the first digit or decimal point, we adjust for the slang. May not work on some mobile browsers, always works on Chrome mobile.
Factors has all of your data automatically. No more typing in numbers - just chat with Coach Kilo and get even faster.
Enter the time you want. The tool returns the lap schedule it demands.
A schedule is only a target until your power says you can hold it. Coach Kilo compares it against what you have actually produced.
What the same ride is worth in thinner or thicker air.
Android coming soon
Gear inches describe how big a gear feels, as a single number you can compare across bikes. On the track the convention is to divide the chainring by the cog and multiply by 27: a 58 × 14 is a 111.9 inch gear, and a 50 × 15 is a 90.
That 27 inch figure is a nominal wheel, not a measured one. General bicycle gear calculators use your actual tyre diameter instead, which is closer to 26.4 inches on a 700 × 23c tubular, so their numbers come out two or three inches lower. Neither is wrong, but they are not interchangeable. The chart above uses the track convention, so the number it gives you is the number riders use in the track centre.
Rollout is the metric equivalent: how far the bike travels for one turn of the cranks. It uses your real tyre circumference rather than a nominal wheel, which is why the tyre selector changes it. A 58 × 14 on a 700 × 23c rolls out about 8.68 metres.
Rollout is what connects cadence to speed. Speed in km/h is cadence multiplied by rollout in metres, multiplied by 60, divided by 1000. That is the whole calculation behind the cadence and speed fields above, and it is why a fixed gear locks the two together: at a given point on the track, your cadence is your speed.
Gear choice is individual and depends on where you make power. Sprinters generally push larger gears with smaller cogs; endurance riders on the bunch events sit lower. Junior riders are gear-restricted by their federation, and those limits are set by rollout rather than gear inches, so check the current rule for your region rather than converting from a chart.
Why does this chart differ from other gear calculators?
Because this one uses the 27 inch track convention and most general calculators use your measured tyre diameter. Compare like with like before assuming either is wrong.
What gear inches am I riding?
Count the teeth on your chainring and cog, enter both above, and the chart will highlight your combination.
What is a good gear for a flying 200?
There is no single answer, because it depends on the cadence at which you produce peak power. The effort planner above will tell you what cadence a given gear demands at a given speed, which is the half of the question a chart can answer.
Does tyre width change my gear inches?
Not under the track convention, since it assumes a fixed 27 inch wheel. It does change your rollout, and therefore the speed and cadence figures.
