Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r17 vs 245/75r17 Tire Comparison Side By Side
  255/65-17 245/75-17 Difference
Diameter inches (mm) 30.05 (763.3) 31.47 (799.3) 1.42 (36) 4.7%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 94.41 (2397.98) 98.86 (2511.08) 4.45 (113.1) 4.7%
Sidewall Height inches (mm) 6.53 (165.75) 7.23 (183.75) 0.71 (18) 10.9%
Revolutions per mile (km) 671.13 (417.02) 640.9 (398.24) -30.23 (-18.78) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.94 mph (33.7 km/h)
25 mph (40.23 km/h)26.18 mph (42.13 km/h)
30 mph (48.28 km/h)31.41 mph (50.56 km/h)
35 mph (56.33 km/h)36.65 mph (58.98 km/h)
40 mph (64.37 km/h)41.89 mph (67.41 km/h)
45 mph (72.42 km/h)47.12 mph (75.84 km/h)
50 mph (80.47 km/h)52.36 mph (84.26 km/h)
55 mph (88.51 km/h)57.59 mph (92.69 km/h)
60 mph (96.56 km/h)62.83 mph (101.11 km/h)
65 mph (104.61 km/h)68.07 mph (109.54 km/h)
70 mph (112.65 km/h)73.3 mph (117.97 km/h)
75 mph (120.7 km/h)78.54 mph (126.39 km/h)
80 mph (128.75 km/h)83.77 mph (134.82 km/h)
85 mph (136.79 km/h)89.01 mph (143.25 km/h)
90 mph (144.84 km/h)94.24 mph (151.67 km/h)
95 mph (152.89 km/h)99.48 mph (160.1 km/h)
100 mph (160.93 km/h)104.72 mph (168.52 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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