Pick your chainring and sprocket. See the gear ratio you’re running, how far the wheel travels per pedal stroke, and how fast you’d roll at any cadence. The shaded table maps every gear within a few teeth either side, so you can see how each shift changes the maths.
Set chainring and sprocket teeth, pick your wheel/tire (for development & speed), and a target cadence. Everything updates live.
Same idea, three different views, the question changes, the picture stays.
Just chainring ÷ sprocket. A 50×15 = 3.33. Bigger ratio = harder to push, more distance per stroke. Useful for comparing setups and understanding range.
Meters of road covered per pedal revolution. Multiplies gear ratio by your wheel circumference. Ground truth, this is what your bike actually does when you turn the cranks once.
Development × cadence, how fast you’d be rolling if you held that rpm. Bump cadence up: see how speed scales. Helpful for picking the right cassette for your event.
The cell shading is always relative to your selected gear, closer cells (less than 5% off) look the same; cells > 20% off go dark navy. The grid stays centered on your choice as you change inputs.
The mistake we see most: athletes pick a cassette that suits their training rides, then get caught in trouble on race day. Three checks that prevent it:
Cadence economy varies by athlete, most people are most efficient between 80–95 rpm. Test it in the lab: run pedal-economy passes at 70 / 80 / 90 / 100 rpm and you’ll see your sweet spot in oxygen cost. Pick gears that keep you in that band on your race’s realistic terrain.
Five gearset archetypes, pick the one that matches your terrain and event.
Old-school race compact. Top end for sprints (53×11 = 4.82), survivable bottom for short steep climbs. Best for flat/rolling road racing.
The modern compact / wide-range cassette. Plenty of top end (50×11 = 4.55), real climbing gear (34×32 = 1.06). Default for most road riders.
1× or large-chainring 2×. Maximizes sustained-cadence range at race pace; close-spaced cassette keeps you in the optimum cadence band.
Sub-1.0 ratios for sustained 8%+ pitches. Common on gravel and climbing-focused road bikes; trades top-end for survivability.
One gear ratio, picked for the velodrome and event. Outdoor fixed riders go lower (around 2.7–3.0); indoor track sprinters push 3.5+.
Adds the power-output dimension to gearing, useful for picking gears for climbs at threshold.
Open → Critical power (CP)Pair with gearing: know your CP, then pick a cassette that lets you hold it on race terrain.
Open → All calculatorsBack to the full catalog, 30+ endurance calculators across performance, fueling, swim, bike, run.
Browse →Pedal-economy testing in the lab measures oxygen cost across cadences from 70–100 rpm at race power. We hand you a number; you pick the cassette that keeps you in your band on race terrain.
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