Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r18 vs 285/75r16 Tire Comparison Side By Side
  265/65-18 285/75-16 Difference
Diameter inches (mm) 31.56 (801.7) 32.83 (833.9) 1.27 (32.2) 4%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 99.16 (2518.61) 103.14 (2619.77) 3.98 (101.16) 4%
Sidewall Height inches (mm) 6.78 (172.25) 8.42 (213.75) 1.63 (41.5) 24.1%
Revolutions per mile (km) 638.98 (397.04) 614.31 (381.71) -24.67 (-15.33) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.8 mph (33.48 km/h)
25 mph (40.23 km/h)26 mph (41.85 km/h)
30 mph (48.28 km/h)31.2 mph (50.22 km/h)
35 mph (56.33 km/h)36.41 mph (58.59 km/h)
40 mph (64.37 km/h)41.61 mph (66.96 km/h)
45 mph (72.42 km/h)46.81 mph (75.33 km/h)
50 mph (80.47 km/h)52.01 mph (83.7 km/h)
55 mph (88.51 km/h)57.21 mph (92.07 km/h)
60 mph (96.56 km/h)62.41 mph (100.44 km/h)
65 mph (104.61 km/h)67.61 mph (108.81 km/h)
70 mph (112.65 km/h)72.81 mph (117.18 km/h)
75 mph (120.7 km/h)78.01 mph (125.55 km/h)
80 mph (128.75 km/h)83.21 mph (133.92 km/h)
85 mph (136.79 km/h)88.41 mph (142.29 km/h)
90 mph (144.84 km/h)93.61 mph (150.66 km/h)
95 mph (152.89 km/h)98.82 mph (159.03 km/h)
100 mph (160.93 km/h)104.02 mph (167.4 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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