Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/45r18 vs 295/50r15 Tire Comparison Side By Side
  295/45-18 295/50-15 Difference
Diameter inches (mm) 28.45 (722.7) 26.61 (676) -1.84 (-46.7) -6.5%
Width inches (mm) 11.61 (295) 11.61 (295) 0 (0) 0%
Circum. inches (mm) 89.39 (2270.43) 83.61 (2123.72) -5.78 (-146.71) -6.5%
Sidewall Height inches (mm) 5.23 (132.75) 5.81 (147.5) 0.58 (14.75) 11.1%
Revolutions per mile (km) 708.83 (440.44) 757.8 (470.87) 48.97 (30.43) 6.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.71 mph (30.11 km/h)
25 mph (40.23 km/h)23.38 mph (37.63 km/h)
30 mph (48.28 km/h)28.06 mph (45.16 km/h)
35 mph (56.33 km/h)32.74 mph (52.69 km/h)
40 mph (64.37 km/h)37.42 mph (60.21 km/h)
45 mph (72.42 km/h)42.09 mph (67.74 km/h)
50 mph (80.47 km/h)46.77 mph (75.27 km/h)
55 mph (88.51 km/h)51.45 mph (82.79 km/h)
60 mph (96.56 km/h)56.12 mph (90.32 km/h)
65 mph (104.61 km/h)60.8 mph (97.85 km/h)
70 mph (112.65 km/h)65.48 mph (105.37 km/h)
75 mph (120.7 km/h)70.15 mph (112.9 km/h)
80 mph (128.75 km/h)74.83 mph (120.43 km/h)
85 mph (136.79 km/h)79.51 mph (127.96 km/h)
90 mph (144.84 km/h)84.18 mph (135.48 km/h)
95 mph (152.89 km/h)88.86 mph (143.01 km/h)
100 mph (160.93 km/h)93.54 mph (150.54 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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