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Chainring Calculator — Compare Chainring Sizes
Compare chainring sizes and their effect on gearing range.
How We Calculate This
Chainring Comparison
The calculator shows the highest gear (big ring / small sprocket) and lowest gear (small ring / big sprocket) for your setup.
Gear Range % = (Highest Ratio / Lowest Ratio) x 100
A wider gear range means more versatility across different terrains.
Frequently Asked Questions
Road compact: 50/34. Road standard: 53/39. Road semi-compact: 52/36. Gravel: 46/30 or 42/28. 1x road: 40-50. 1x mountain: 30-34.
50/34 gives a wider range and easier climbing. 52/36 gives smaller jumps between gears when changing chainrings. Choose based on your terrain and fitness.
The difference between big and small rings affects front shifting quality. Shimano recommends a maximum difference of 16 teeth for optimal shifting.
Related Calculators
Gear Range Calculator
Compare total gear range across different drivetrain setups.
Gear Ratio Calculator
Calculate gear ratios from chainring and sprocket tooth counts.
Gear Inch Calculator
Calculate gear inches, development in metres and speed at 80, 90 and 100 rpm for any chainring, cog, wheel size and tyre width combination.
Gear Inches Calculator
Convert gear ratios to gear inches for comparison.
Development Calculator
Calculate distance travelled per pedal revolution for any gear.
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Last updated: June 2026
All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.