Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/75r14 vs 235/75r15 Tire Comparison Side By Side
  205/75-14 235/75-15 Difference
Diameter inches (mm) 26.11 (663.1) 28.88 (733.5) 2.77 (70.4) 10.6%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 82.02 (2083.19) 90.72 (2304.36) 8.71 (221.17) 10.6%
Sidewall Height inches (mm) 6.05 (153.75) 6.94 (176.25) 0.89 (22.5) 14.6%
Revolutions per mile (km) 772.54 (480.03) 698.39 (433.96) -74.15 (-46.07) -9.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.12 mph (35.6 km/h)
25 mph (40.23 km/h)27.65 mph (44.51 km/h)
30 mph (48.28 km/h)33.19 mph (53.41 km/h)
35 mph (56.33 km/h)38.72 mph (62.31 km/h)
40 mph (64.37 km/h)44.25 mph (71.21 km/h)
45 mph (72.42 km/h)49.78 mph (80.11 km/h)
50 mph (80.47 km/h)55.31 mph (89.01 km/h)
55 mph (88.51 km/h)60.84 mph (97.91 km/h)
60 mph (96.56 km/h)66.37 mph (106.81 km/h)
65 mph (104.61 km/h)71.9 mph (115.71 km/h)
70 mph (112.65 km/h)77.43 mph (124.61 km/h)
75 mph (120.7 km/h)82.96 mph (133.52 km/h)
80 mph (128.75 km/h)88.49 mph (142.42 km/h)
85 mph (136.79 km/h)94.02 mph (151.32 km/h)
90 mph (144.84 km/h)99.56 mph (160.22 km/h)
95 mph (152.89 km/h)105.09 mph (169.12 km/h)
100 mph (160.93 km/h)110.62 mph (178.02 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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