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2013 Ford Mustang Shelby-GT500 6 speed manual Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Ford Mustang Shelby-GT500 can go in each gear as calculated by the gear ratios, engine redline and tire size.
The ultimate top speed may be limted by the power, drag and aerodynamics of each individual car.

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Tire Size
(345/30/20)
/ -
OR
Tire Diameter
(inches)
 
Final Drive Ratio
Redline (RPM)
1st Gear
2nd Gear
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear
8th Gear

RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear
500 4.21 7.03 9.63 12.52 16.92 25.04 0 0
600 5.06 8.44 11.55 15.02 20.3 30.04 0 0
700 5.9 9.85 13.48 17.52 23.68 35.05 0 0
800 6.74 11.25 15.41 20.03 27.07 40.06 0 0
900 7.59 12.66 17.33 22.53 30.45 45.06 0 0
1000 8.43 14.06 19.26 25.04 33.83 50.07 0 0
1100 9.27 15.47 21.18 27.54 37.21 55.08 0 0
1200 10.12 16.88 23.11 30.04 40.6 60.08 0 0
1300 10.96 18.28 25.04 32.55 43.98 65.09 0 0
1400 11.8 19.69 26.96 35.05 47.36 70.1 0 0
1500 12.64 21.1 28.89 37.55 50.75 75.11 0 0
1600 13.49 22.5 30.81 40.06 54.13 80.11 0 0
1700 14.33 23.91 32.74 42.56 57.51 85.12 0 0
1800 15.17 25.32 34.66 45.06 60.9 90.13 0 0
1900 16.02 26.72 36.59 47.57 64.28 95.13 0 0
2000 16.86 28.13 38.52 50.07 67.66 100.14 0 0
2100 17.7 29.54 40.44 52.57 71.05 105.15 0 0
2200 18.54 30.94 42.37 55.08 74.43 110.15 0 0
2300 19.39 32.35 44.29 57.58 77.81 115.16 0 0
2400 20.23 33.76 46.22 60.08 81.2 120.17 0 0
2500 21.07 35.16 48.14 62.59 84.58 125.18 0 0
2600 21.92 36.57 50.07 65.09 87.96 130.18 0 0
2700 22.76 37.97 52 67.59 91.34 135.19 0 0
2800 23.6 39.38 53.92 70.1 94.73 140.2 0 0
2900 24.45 40.79 55.85 72.6 98.11 145.2 0 0
3000 25.29 42.19 57.77 75.11 101.49 150.21 0 0
3100 26.13 43.6 59.7 77.61 104.88 155.22 0 0
3200 26.97 45.01 61.63 80.11 108.26 160.23 0 0
3300 27.82 46.41 63.55 82.62 111.64 165.23 0 0
3400 28.66 47.82 65.48 85.12 115.03 170.24 0 0
3500 29.5 49.23 67.4 87.62 118.41 175.25 0 0
3600 30.35 50.63 69.33 90.13 121.79 180.25 0 0
3700 31.19 52.04 71.25 92.63 125.18 185.26 0 0
3800 32.03 53.45 73.18 95.13 128.56 190.27 0 0
3900 32.87 54.85 75.11 97.64 131.94 195.27 0 0
4000 33.72 56.26 77.03 100.14 135.33 200.28 0 0
4100 34.56 57.67 78.96 102.64 138.71 205.29 0 0
4200 35.4 59.07 80.88 105.15 142.09 210.3 0 0
4300 36.25 60.48 82.81 107.65 145.47 215.3 0 0
4400 37.09 61.88 84.73 110.15 148.86 220.31 0 0
4500 37.93 63.29 86.66 112.66 152.24 225.32 0 0
4600 38.78 64.7 88.59 115.16 155.62 230.32 0 0
4700 39.62 66.1 90.51 117.67 159.01 235.33 0 0
4800 40.46 67.51 92.44 120.17 162.39 240.34 0 0
4900 41.3 68.92 94.36 122.67 165.77 245.34 0 0
5000 42.15 70.32 96.29 125.18 169.16 250.35 0 0
5100 42.99 71.73 98.21 127.68 172.54 255.36 0 0
5200 43.83 73.14 100.14 130.18 175.92 260.37 0 0
5300 44.68 74.54 102.07 132.69 179.31 265.37 0 0
5400 45.52 75.95 103.99 135.19 182.69 270.38 0 0
5500 46.36 77.36 105.92 137.69 186.07 275.39 0 0
5600 47.2 78.76 107.84 140.2 189.46 280.39 0 0
5700 48.05 80.17 109.77 142.7 192.84 285.4 0 0
5800 48.89 81.58 111.7 145.2 196.22 290.41 0 0
5900 49.73 82.98 113.62 147.71 199.6 295.42 0 0
6000 50.58 84.39 115.55 150.21 202.99 300.42 0 0
6100 51.42 85.79 117.47 152.71 206.37 305.43 0 0
6200 52.26 87.2 119.4 155.22 209.75 310.44 0 0
6300 53.1 88.61 121.32 157.72 213.14 315.44 0 0
6400 53.95 90.01 123.25 160.23 216.52 320.45 0 0
6500 54.79 91.42 125.18 162.73 219.9 325.46 0 0
6600 55.63 92.83 127.1 165.23 223.29 330.46 0 0
6700 56.48 94.23 129.03 167.74 226.67 335.47 0 0
6800 57.32 95.64 130.95 170.24 230.05 340.48 0 0
6900 58.16 97.05 132.88 172.74 233.44 345.49 0 0
7000 59.01 98.45 134.8 175.25 236.82 350.49 0 0
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear 7th Gear 8th Gear





Some additional information on how these are calculated:

When D is the diameter of the tire, the car moves forward a distance πD with each revolution of the tire. If there are F revolutions per unit of time, it moves forward at a speed of πD´F per unit of time. If D is in inches and F is in revolutions per minute (rpm), the above result will be in inches per minute. There are 63,360 inches in a mile and 60 minutes in an hour, so one inch per minute equals 60/63360 miles per hour or 1/1056 mph. So we have the following formula:

V(mph) = D(in) ´ F(rpm) ´ (π/1056)

In the automotive industry, the coefficient 1056/π is usually taken to be equal to 336 (exactly it is 336.1352398...) and the formula corresponding to the above is:

(mph)(gear ratio)(336) = (tire diameter in inches)(rpm)

With the above numerical approximation, both formulas are identical if we consider that (rpm)/(gear ratio) is the rate of rotation of the tires. So the "gear ratio" as the number of rotations of the driveshaft for each turn of the tire. This ratio is normally more than 1, except in overdrive gear. So, calling R the "gear ratio", your final answer is:

V(mph) = D(in) ´ F(rpm) ´ (π/1056) / R

or, approximately: V = (D ´ F) / (336 ´ R)

where V is the velocity (in mph), D the tire diameter (in inches), F the engine rpm, and R the gear ratio.

 


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