Engine RPM at Speed (Gear Ratios)
Calculate engine RPM at a given road speed from gear ratio, final drive and tyre size, or the top speed at redline, free online.
About this calculator
RPM = speed × gear ratio × final drive ratio × 1000 ÷ (60 × tyre circumference in metres) with speed in km/h. Top speed in a gear = redline RPM × 60 × circumference ÷ (gear ratio × final drive × 1000).