Pick a vehicle for factory ratios, or enter your own. Compare a regear
or a tyre size change side by side before you buy.
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RPM
ENGINE RPM BY GEAR AND SPEED
Amber = Setup A · teal = Setup B · greyed = beyond redline, that gear won't reach that speed.
TOP SPEED PER GEAR AT REDLINE
OVERALL DRIVE RATIO PER GEAR
Gear ratio × final drive. Lower number = taller gearing = fewer rpm per km/h.
WORK OUT AN UNKNOWN FINAL DRIVE
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FINAL DRIVE
Don't know your axle ratio, or suspect the badge is wrong? Drive at a steady
speed in a known gear, read the tacho, and use a GPS for the speed — never the speedometer,
which is deliberately optimistic and worthless once tyre size changes.