SEE YOUR GEARS · COMPARE YOUR CADENCE

Bicycle Gearing & Cadence Planner

Compare chainring and cassette combinations, distance per pedal turn and speed at your chosen cadence. Save alternative setups before changing your gearing.

1. Your drivetrain

Front chainring teeth, separated by commasRear cassette teeth, separated by commasWheel circumference (millimeters)

Pedaling cadence (rpm)Speed unitTarget riding speedGear row display

Up to three chainrings and 16 distinct sprockets, 6–100 teeth each. Example circumferences are approximate: measure your loaded tire rollout for a better input.

Setup name

Open project

2. Gear range

Preparing gear ratios…

Selected gear

Choose a row in the table below.

Calculated speed assumes rolling without slip at constant cadence. It does not predict achievable speed, climbing ability, rider power or hardware compatibility.

Saved setup comparisons

Every chainring / sprocket combination

Click Inspect to see a gear's cadence range. Sorted adjacent ratios are mathematical neighbors, not a recommended shift sequence; equal ratios can repeat between chainrings.

Front / rear	Ratio	Development	Gear inches	Speed	Target rpm	Next-ratio step	Inspect

Compare the gears you actually use

Enter front and rear tooth counts. Each combination is calculated separately, including near-duplicate ratios.
Enter measured wheel circumference, select a cadence and a target speed. Switching speed units converts the target speed too.
Inspect a low or high gear, save a setup and adjust the cassette or chainrings to compare alternatives.
Export all combinations as CSV or reopen a settings project later.

Ratio = front teeth ÷ rear teeth. Development = wheel circumference × ratio. Speed in km/h = development in meters × cadence × 0.06. Gear inches uses effective rolling diameter = circumference ÷ π. Range = highest ratio ÷ lowest ratio × 100%; a 400% range means the highest ratio is four times the lowest.

The target-cadence value is a calculation, not a recommended training cadence. No hub gearing, motor assistance, tire slip, suspension motion, drivetrain efficiency, derailleur capacity, chainline or chain-length rules are modeled. Consult component documentation for mechanical compatibility.

References: Garmin wheel circumference chart · SRAM gearing explanation. Examples describe numerical setups, not product recommendations. Related: Speed, Distance & Time · Unit Converter.

Using Bicycle Gearing & Cadence Planner

Compare the mathematical speed and rollout of every sprocket/chainring combination.

Enter front and rear teeth and measured wheel circumference.
Choose cadence and target speed, then inspect individual gears.
Save alternative setups and export all calculations or a reusable project.

Example

Start with 50/34 chainrings, an 11–32 cassette and a 2,105 mm rolling circumference at 90 rpm.

Questions & answers

Does this check drivetrain compatibility?

No. Tooth-count math does not determine derailleur capacity, chainline, chain length or component compatibility. Consult component documentation.

How is speed calculated?

Development is circumference times front/rear ratio. Speed in km/h is development in meters times rpm times 0.06, assuming rolling without slip.

What does gear range mean?

Highest ratio divided by lowest ratio, multiplied by 100. A 400% range means the highest ratio is four times the lowest.

Is the target cadence a recommendation?

No. It is only the rpm needed mathematically for the entered target speed and gear. It does not estimate power, terrain performance or rider capability.

Can I compare setups?

Save up to six alternatives alongside the live setup. Download all combinations as CSV or save/reopen a JSON project. No data is uploaded.