WD-40 is not chain lube.
It is, in fact, the single most expensive mistake in casual bike ownership. WD-40 is a solvent and a water displacer — it strips lubricant rather than adding it. Used on a drivetrain, it dries fast, leaves residue, attracts grit, and turns a clean chain into a grinding paste within a single ride.
A bike-specific chain lube — wet for rain and gravel, dry for clean road riding — applied one drop per link and wiped clean, will outlast a household spray by an order of magnitude. The drivetrain runs quieter, the cassette wears less, and the chain itself can double in lifespan.
- Use bike-specific chain lube. Finish Line, Rock-N-Roll, and Squirt all work well.
- One drop per roller, spin the cranks, wipe the excess. Less is more.
- If the drivetrain is noisy even after a clean and re-lube, it's worth a tune-up — chains stretch and cassettes wear in pairs.