About

About Four Motorcycling

Four Motorcycling is a new site of calculators and short guides for street riders. The work is meant for a garage laptop or a phone next to a sprocket bag: tooth counts, a tank size, a tire stamp, and a clear formula.

The default units are the ones on US roads and US pumps: miles, miles per hour, miles per gallon, and the US gallon. Chain sizes 520, 525, and 530 appear as labeled fields. A metric switch is there when you want kilometers and liters, and the pages say so.

Every tool runs in the browser. There is no account and no tracker. After the first load, the fields keep working without a network. Sprocket teeth and the tire size you enter stay on this device, so the tools can share one setup.

The calculators do not ship a library of model-year gearboxes. You enter the ratios you have. Speed in gear is a model, not a GPS reading. Tire circumference from a size stamp is geometry, not a loaded measurement from a specific brand.

If you want the long list, start at tools. If you want the assumptions in sentences, start at guides.