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Calculate your drivetrain instantly. See climbing gear, top speed, cadence speed, and real drivetrain range. Check compatible parts on BikePartPicker.
Tap a preset to load it as your setup.
Active gear: 50T × 11T
Hover the summary cards or gear table cells to highlight the matching chainring and sprocket.
e.g. 50-34, 52-36, 42 (1x)
e.g. 11-28, 11-34, 10-44
Typical road cadence is 80–100 rpm.
Used with wheel size to estimate rollout.
Wheel BSD + tyre width is used to estimate rollout.
Moderate jumps: balanced all-round gearing
A reasonable spread between sprockets — versatile for mixed terrain.
Gear jump analysis is based on exact sprockets where known, or an estimated progression for range-only cassettes.
| Ring \ Sprocket | 11T | 12T | 13T | 14T | 15T | 17T | 19T | 21T | 24T | 27T | 30T |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50T | 4.55 52.3 kph | 4.17 47.9 kph | 3.85 44.2 kph | 3.57 41.1 kph | 3.33 38.3 kph | 2.94 33.8 kph | 2.63 30.3 kph | 2.38 27.4 kph | 2.08 24.0 kph | 1.85 21.3 kph | 1.67 19.2 kph |
| 34T | 3.09 35.6 kph | 2.83 32.6 kph | 2.62 30.1 kph | 2.43 27.9 kph | 2.27 26.1 kph | 2.00 23.0 kph | 1.79 20.6 kph | 1.62 18.6 kph | 1.42 16.3 kph | 1.26 14.5 kph | 1.13 13.0 kph |
A few short answers to the questions cyclists ask when comparing chainrings and cassettes. Use the calculator above to see the numbers for your own setup.
A gear ratio is the number of times the rear wheel turns for each pedal revolution: the chainring tooth count divided by the sprocket tooth count. Higher ratios give more speed per stroke (and need more force). Lower ratios are easier to push but cover less ground.
The top sprocket (11T) is the same, so your top gear is unchanged. The 34T bailout is roughly 13% lower than a 30T, giving you a meaningfully easier climbing gear. The trade-off is slightly larger jumps between adjacent sprockets.
Compact (50/34) is the climber-friendly default. Semi-compact (52/36) raises both rings by ~2T, giving you a slightly higher top end and tighter front shifts, at the cost of a slightly harder small-ring climbing gear. The same cassette will feel about 5–6% harder on a 36T inner than a 34T.
1x is simpler, lighter, and removes front-shift trouble. Great for gravel and modern road bikes. 2x gives you a wider total range with smaller jumps between gears, which is easier on cadence at race pace and on long flat days. The right answer depends on your terrain and how much you care about cadence smoothness vs simplicity.
For a given gear ratio, a larger overall wheel (700c × 32mm vs 650b × 47mm vs 26 × 2.1″) rolls slightly different distances per pedal revolution. The differences are small but real Wider tyres and bigger wheels both increase development. Use the wheel size and tyre width inputs above to see the effect on your speed at a given cadence.
Total range tells you how versatile a drivetrain is (high ratio divided by low ratio). But two drivetrains with the same range can feel very different. Smaller jumps between sprockets let you stay closer to your preferred cadence, while larger jumps cover the same ground in fewer cogs. Look at both the range percentage and the per-step jumps to get a complete picture.
Use BikePartPicker to check that your cassette, derailleur, chain and chainset actually work together, before you spend a penny.