Gear Ratio Calculator

With Gear Ratio Calculator you can see the theoretical top speeds in all gears. You can change tire dimensions to calculate the effect on top speed and gearing. It will help you to find the best gear ratios for your racing car and to understand when it is the best time to change a gear.

 Maximum Power RPM: Revolutions per minute when reaching the top of the power curve. Width Profile Wheel diameter Tire Diameter [mm]: OR 135 145 155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335 345 355 365 375 20 25 30 35 40 45 50 55 60 65 70 75 80 85 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Numbers of teeth Gear Ratio Final Drive Ratio: x OR 1st Gear Ratio: x OR 2nd Gear Ratio: x OR 3rd Gear Ratio: x OR 4th Gear Ratio: x OR 5th Gear Ratio: x OR 6th Gear Ratio: x OR Speed in: kmh mph http://www.cargister.com/calculator-gear-ratio?rpm=6500&final_ratio_teeths[]=&final_ratio_teeths[]=&fdr=3.07&diameter=677.2&ratio=3.27&ratio=1.98&ratio=1.34&ratio=1&ratio=.68&ratio=&speed_in=mph&width=275&profile=40&wheel_diameter=18&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=&teeths[]=

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Gear shift Difference after shifting RPM after shifting
from 1st Gear to 2nd Gear 2564 3936
from 2nd Gear to 3rd Gear 2101 4399
from 3rd Gear to 4th Gear 1649 4851
from 4th Gear to 5th Gear 2080 4420
 mph / RPM 1000 2000 3000 4000 5000 6000 6500 1st Gear 7.9 15.8 23.7 31.6 39.5 47.4 51.4 2nd Gear 13 26.1 39.1 52.2 65.2 78.3 84.8 3rd Gear 19.3 38.6 57.8 77.1 96.4 115.7 125.3 4th Gear 25.8 51.7 77.5 103.3 129.2 155 167.9 5th Gear 38 76 114 152 190 228 247

This calculator is completely based on mathematical formulas to be useful to you. Try the Transmission Gear Ratio Calculator now.