Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/80r14 vs 195/65r15 Tire Comparison Side By Side
  175/80-14 195/65-15 Difference
Diameter inches (mm) 25.02 (635.6) 24.98 (634.5) -0.04 (-1.1) -0.2%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 78.61 (1996.8) 78.48 (1993.34) -0.14 (-3.46) -0.2%
Sidewall Height inches (mm) 5.51 (140) 4.99 (126.75) -0.52 (-13.25) -9.5%
Revolutions per mile (km) 805.96 (500.8) 807.36 (501.67) 1.4 (0.87) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.97 mph (32.13 km/h)
25 mph (40.23 km/h)24.96 mph (40.16 km/h)
30 mph (48.28 km/h)29.95 mph (48.2 km/h)
35 mph (56.33 km/h)34.94 mph (56.23 km/h)
40 mph (64.37 km/h)39.93 mph (64.26 km/h)
45 mph (72.42 km/h)44.92 mph (72.3 km/h)
50 mph (80.47 km/h)49.91 mph (80.33 km/h)
55 mph (88.51 km/h)54.9 mph (88.36 km/h)
60 mph (96.56 km/h)59.9 mph (96.39 km/h)
65 mph (104.61 km/h)64.89 mph (104.43 km/h)
70 mph (112.65 km/h)69.88 mph (112.46 km/h)
75 mph (120.7 km/h)74.87 mph (120.49 km/h)
80 mph (128.75 km/h)79.86 mph (128.52 km/h)
85 mph (136.79 km/h)84.85 mph (136.56 km/h)
90 mph (144.84 km/h)89.84 mph (144.59 km/h)
95 mph (152.89 km/h)94.84 mph (152.62 km/h)
100 mph (160.93 km/h)99.83 mph (160.66 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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