Free interactive tools built for the workbench — the math you actually do in the garage, without the math. Tap a tile and go.
A virtual Ratio Rite mix cup: pick your ratio, set your gallons, and fill the oil right to the line. Opens at 50:1, quick chart to 10 gallons, custom batches to 30 — plus the Motul oils we’d pour.
Resting voltage or a hydrometer reading in — state of charge, cell health, and the right charger settings out. Speaks flooded lead-acid, AGM, and lithium (LiFePO4), because each one reads different.
Front (countershaft) and rear sprocket teeth in, final-drive ratio out — with an animated drivetrain showing the chain running around both sprockets.
The 10th character is the model year: the year chart sits at the top, with a tappable example VIN breakdown below it. 1981 and newer only — a chart to read from, not a VIN to type in.
New tire vs stock: diameter change, speedometer error, and effective gearing change — plus a DOT date-code decoder that tells you how old your tires really are.
© 2026 Chinese Motorcycle Review. These Garage Tools, their design and wording are original to CMR — please don't republish or clone them.
