Tools / Datalog
Let the data tell you.
Paste RPM and speed data to identify gears and work backward to your ratios.
RPM + Speed Data
Paste CSV, tab-separated, or space-separated columns. Expects RPM and Speed values.
Known Values
Optional. Provide what you know to refine results.
If known, individual gear ratios will be back-solved.
275/35R20 — 731 rev/mi
Leave blank to auto-detect from data clustering.
How It Works
Each gear has a constant relationship between RPM and road speed. This tool groups your data points by that ratio to identify which gear each point was logged in.
Effective Ratio = gear ratio × final drive. If you provide the final drive, individual gear ratios are back-solved.
Best results come from steady-state pulls in each gear (WOT or cruise), not during shifts. More data points per gear = better accuracy.