BestBikeFit4U calculator
Gearing Calculator
Quickly understand your easiest and hardest gear, speed at your cadence, and whether your setup can handle the climb you have in mind.
Why this works
Exact gearing math, fast route check
The public calculator lays the groundwork. The dashboard later adds rider and event context.
Exact drivetrain math
Chainring, cassette, and wheel size convert straight into ratio, development, and speed.
Honest climb verdict
The tool does not pretend to know more than it does: the climb readout is a practical rule, not a power meter.
Clear upgrade direction
You can see right away whether a larger cassette, smaller inner ring, or wider 1x range makes more sense.
Build your setup
Use the chainring, cassette, and wheel circumference from your real bike. The tool gives exact gearing math and a simple climb-readiness readout.
Exact math, simple explanation
The defaults give you a useful starting point right away. Change them to your own setup for a more precise comparison.
Choose 1x or 2x.
This refines the climb-readiness verdict.
Pick the band closest to your route.
Choose a quick circumference estimate, then tweak it manually if needed.
For 1x, this is your only chainring.
The smaller ring determines your easiest gear.
Start with a known cassette, then fine-tune the cog sizes.
Use the smallest cog on your cassette.
This is your easiest gear for climbing.
Adjust this if you know your exact circumference.
Use your usual climbing cadence.
The tool uses this to judge the easy gear against the climb.
Result
Your easiest and hardest gears, plus a quick climb-readiness readout.
Easiest gear
1.00x ratio · 26.4 gear inches
Hardest gear
4.54x ratio · 119.9 gear inches
Speed in easiest gear
At 80 rpm on a 8.0% climb.
Speed in hardest gear
Useful for seeing your top-end range on flatter roads.
Gear span
The larger this is, the wider your spread from easiest to hardest gear.
Climb verdict
Challenging
Your easiest gear is close to the edge for a 8.0% climb. A smaller inner chainring would make this noticeably easier.
Explanation
Why this result changed
Confidence: High confidence
Next best action: Open the dashboard to compare this setup against your real bike setup.
Primary drivers
- Chainring and cassette combination
- Wheel circumference
- Cadence
Secondary modifiers
- Climb gradient
- Climb length band
- Bike type
Not covered here
- Rider weight, FTP, and exact climb duration
- Fatigue, wind, and altitude
What's next?
Compare this with your dashboard setup
Create a free account to compare this setup with your real bike and refine the climb verdict further.
Explore more
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