SpecMatch: Bike Parts

Mismatched upgrades leave riders stranded with a cassette that won't mate a chain, a hub that rejects an axle, a brake that fights its rotor. This tool exists to walk that dependency tree before you wrench—so DIY mechanics and owners can prove which parts lock together and which break the build while the money is still in their pocket. From a motorcycle or bicycle project you hang tagged components—chain, cassette, chainring, hub, rim, tire, brake—then step through a branching constraint wizard. Compatible, blocked, and alternate outcome cards speak in plain reasons; conflict review shows exactly why a pairing fails; street and trail variants fork the same bike so you can compare two upgrade paths side by side. Node coverage lights the gaps still waiting for a matched part. Saved case presets keep successful drivetrain recipes ready to reuse, and archived builds shelf the experiments that never belonged on the stand. Reverse a choice with transparent rule text—no guesswork, just the path that locks.