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Gear Ratio Calculator >>

2011 Dodge Challenger R/T TR6060 Gear Ratios Calculator, MPH, Top Speed

 


This calculator outputs the how fast the Dodge Challenger R/T 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 3.63 5.14 7.39 10.79 14.58 21.58 0 0
600 4.36 6.17 8.87 12.95 17.5 25.89 0 0
700 5.09 7.19 10.35 15.11 20.41 30.21 0 0
800 5.81 8.22 11.82 17.26 23.33 34.53 0 0
900 6.54 9.25 13.3 19.42 26.24 38.84 0 0
1000 7.27 10.28 14.78 21.58 29.16 43.16 0 0
1100 7.99 11.3 16.26 23.74 32.08 47.47 0 0
1200 8.72 12.33 17.74 25.89 34.99 51.79 0 0
1300 9.45 13.36 19.21 28.05 37.91 56.1 0 0
1400 10.17 14.39 20.69 30.21 40.82 60.42 0 0
1500 10.9 15.41 22.17 32.37 43.74 64.74 0 0
1600 11.62 16.44 23.65 34.53 46.66 69.05 0 0
1700 12.35 17.47 25.13 36.68 49.57 73.37 0 0
1800 13.08 18.5 26.6 38.84 52.49 77.68 0 0
1900 13.8 19.52 28.08 41 55.4 82 0 0
2000 14.53 20.55 29.56 43.16 58.32 86.31 0 0
2100 15.26 21.58 31.04 45.32 61.24 90.63 0 0
2200 15.98 22.61 32.52 47.47 64.15 94.95 0 0
2300 16.71 23.63 33.99 49.63 67.07 99.26 0 0
2400 17.44 24.66 35.47 51.79 69.98 103.58 0 0
2500 18.16 25.69 36.95 53.95 72.9 107.89 0 0
2600 18.89 26.72 38.43 56.1 75.82 112.21 0 0
2700 19.62 27.74 39.91 58.26 78.73 116.52 0 0
2800 20.34 28.77 41.38 60.42 81.65 120.84 0 0
2900 21.07 29.8 42.86 62.58 84.56 125.16 0 0
3000 21.8 30.83 44.34 64.74 87.48 129.47 0 0
3100 22.52 31.85 45.82 66.89 90.4 133.79 0 0
3200 23.25 32.88 47.3 69.05 93.31 138.1 0 0
3300 23.98 33.91 48.77 71.21 96.23 142.42 0 0
3400 24.7 34.94 50.25 73.37 99.15 146.73 0 0
3500 25.43 35.96 51.73 75.53 102.06 151.05 0 0
3600 26.16 36.99 53.21 77.68 104.98 155.37 0 0
3700 26.88 38.02 54.69 79.84 107.89 159.68 0 0
3800 27.61 39.05 56.16 82 110.81 164 0 0
3900 28.34 40.07 57.64 84.16 113.73 168.31 0 0
4000 29.06 41.1 59.12 86.31 116.64 172.63 0 0
4100 29.79 42.13 60.6 88.47 119.56 176.94 0 0
4200 30.52 43.16 62.08 90.63 122.47 181.26 0 0
4300 31.24 44.18 63.55 92.79 125.39 185.58 0 0
4400 31.97 45.21 65.03 94.95 128.31 189.89 0 0
4500 32.69 46.24 66.51 97.1 131.22 194.21 0 0
4600 33.42 47.27 67.99 99.26 134.14 198.52 0 0
4700 34.15 48.3 69.47 101.42 137.05 202.84 0 0
4800 34.87 49.32 70.94 103.58 139.97 207.15 0 0
4900 35.6 50.35 72.42 105.74 142.89 211.47 0 0
5000 36.33 51.38 73.9 107.89 145.8 215.79 0 0
5100 37.05 52.41 75.38 110.05 148.72 220.1 0 0
5200 37.78 53.43 76.86 112.21 151.63 224.42 0 0
5300 38.51 54.46 78.33 114.37 154.55 228.73 0 0
5400 39.23 55.49 79.81 116.52 157.47 233.05 0 0
5500 39.96 56.52 81.29 118.68 160.38 237.36 0 0
5600 40.69 57.54 82.77 120.84 163.3 241.68 0 0
5700 41.41 58.57 84.25 123 166.21 246 0 0
5800 42.14 59.6 85.72 125.16 169.13 250.31 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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