Bike Gear Chart

In short A gear chart lays out every chainring and sprocket combination on a drivetrain so you can see the whole range at once, and it usually reveals that you have fewer gears than the marketing says. A 2 × 11 groupset is sold as 22 gears, but many of those combinations produce almost identical ratios: the big ring with a mid sprocket lands in the same place as the small ring with a smaller one. This tool searches for those duplicates at a threshold you set rather than quoting a number from a table, so you can see exactly which gears repeat and by how much. Two other things fall out of the chart. The RANGE — highest gear inches divided by lowest — is the number that decides whether the bike can climb what you point it at and still pedal downhill; it is quoted as a percentage, and a modern wide-range 1× drivetrain reaches 500% or more. And the combinations at each extreme, big ring with big sprocket and small with small, run the chain at a sharp angle. They work, they wear faster, and they are usually duplicates of a gear you already have — which is why the count of genuinely useful gears is lower again.