Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r16 vs 245/75r16 Tire Comparison Side By Side
  255/65-16 245/75-16 Difference
Diameter inches (mm) 29.05 (737.9) 30.47 (773.9) 1.42 (36) 4.9%
Width inches (mm) 10.04 (255) 9.65 (245) -0.39 (-10) -3.9%
Circum. inches (mm) 91.27 (2318.18) 95.72 (2431.28) 4.45 (113.1) 4.9%
Sidewall Height inches (mm) 6.53 (165.75) 7.23 (183.75) 0.71 (18) 10.9%
Revolutions per mile (km) 694.23 (431.37) 661.93 (411.31) -32.29 (-20.07) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.98 mph (33.76 km/h)
25 mph (40.23 km/h)26.22 mph (42.2 km/h)
30 mph (48.28 km/h)31.46 mph (50.64 km/h)
35 mph (56.33 km/h)36.71 mph (59.08 km/h)
40 mph (64.37 km/h)41.95 mph (67.51 km/h)
45 mph (72.42 km/h)47.2 mph (75.95 km/h)
50 mph (80.47 km/h)52.44 mph (84.39 km/h)
55 mph (88.51 km/h)57.68 mph (92.83 km/h)
60 mph (96.56 km/h)62.93 mph (101.27 km/h)
65 mph (104.61 km/h)68.17 mph (109.71 km/h)
70 mph (112.65 km/h)73.42 mph (118.15 km/h)
75 mph (120.7 km/h)78.66 mph (126.59 km/h)
80 mph (128.75 km/h)83.9 mph (135.03 km/h)
85 mph (136.79 km/h)89.15 mph (143.47 km/h)
90 mph (144.84 km/h)94.39 mph (151.91 km/h)
95 mph (152.89 km/h)99.63 mph (160.35 km/h)
100 mph (160.93 km/h)104.88 mph (168.79 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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