Pick any two components — we'll find what fits the third.
Choose any two components below. The Matcher will rank every option for the third by how closely the cable pull times the derailleur's leverage matches the cassette's cog spacing.
How the math works
Officially, you stay inside one groupset. In reality, drivetrains are just cable pull times derailleur leverage compared against cog pitch. GearGrindr does the math so you can build the bike you actually want.
Every shifter pulls a specific amount of cable each time you click. Shimano 11s road = 2.7mm. SRAM 11s MTB = 3.8mm. Etc.
The derailleur multiplies cable pull into lateral cage movement. A 1.4 leverage means 1mm of cable becomes 1.4mm of sideways cage movement.
That movement should equal the cassette's cog-to-cog distance. If it does, the chain lands on the next cog cleanly.
GearGrindr compares this calculated movement against the cassette's actual cog pitch. A deviation under ±1.5% indexes perfectly. Up to ±4% usually tunes in. Beyond ±8%, don't bother.