Does anyone have a standard for speed vs rpm ratio?

There isn't a universal standard for speed-to-RPM ratiOS, as it varies significantly based on the specific application, type of machinery, and gearing involved. For example, in automotive contexts, the ratio depends on the engine design, transmission, and wheel size. Generally, manufacturers provide specifications for each system, and these can be calculated using formulas that relate torque, horsepower, and gear ratiOS. It's important to consult specific equipment manuals or engineering guidelines for accurate ratiOS relevant to your application.