Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/70r20 vs 295/70r18 Tire Comparison Side By Side
  295/70-20 295/70-18 Difference
Diameter inches (mm) 36.26 (921) 34.26 (870.2) -2 (-50.8) -5.5%
Width inches (mm) 11.61 (295) 11.61 (295) 0 (0) 0%
Circum. inches (mm) 113.91 (2893.41) 107.63 (2733.81) -6.28 (-159.59) -5.5%
Sidewall Height inches (mm) 8.13 (206.5) 8.13 (206.5) 0 (0) 0%
Revolutions per mile (km) 556.21 (345.61) 588.68 (365.79) 32.47 (20.18) 5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.9 mph (30.41 km/h)
25 mph (40.23 km/h)23.62 mph (38.01 km/h)
30 mph (48.28 km/h)28.35 mph (45.62 km/h)
35 mph (56.33 km/h)33.07 mph (53.22 km/h)
40 mph (64.37 km/h)37.79 mph (60.82 km/h)
45 mph (72.42 km/h)42.52 mph (68.43 km/h)
50 mph (80.47 km/h)47.24 mph (76.03 km/h)
55 mph (88.51 km/h)51.97 mph (83.63 km/h)
60 mph (96.56 km/h)56.69 mph (91.23 km/h)
65 mph (104.61 km/h)61.41 mph (98.84 km/h)
70 mph (112.65 km/h)66.14 mph (106.44 km/h)
75 mph (120.7 km/h)70.86 mph (114.04 km/h)
80 mph (128.75 km/h)75.59 mph (121.65 km/h)
85 mph (136.79 km/h)80.31 mph (129.25 km/h)
90 mph (144.84 km/h)85.04 mph (136.85 km/h)
95 mph (152.89 km/h)89.76 mph (144.46 km/h)
100 mph (160.93 km/h)94.48 mph (152.06 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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