Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/60r18 vs 285/75r18 Tire Comparison Side By Side
  305/60-18 285/75-18 Difference
Diameter inches (mm) 32.41 (823.2) 34.83 (884.7) 2.42 (61.5) 7.5%
Width inches (mm) 12.01 (305) 11.22 (285) -0.79 (-20) -6.6%
Circum. inches (mm) 101.82 (2586.16) 109.42 (2779.37) 7.61 (193.21) 7.5%
Sidewall Height inches (mm) 7.2 (183) 8.42 (213.75) 1.21 (30.75) 16.8%
Revolutions per mile (km) 622.29 (386.67) 579.03 (359.79) -43.26 (-26.88) -7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.49 mph (34.59 km/h)
25 mph (40.23 km/h)26.87 mph (43.24 km/h)
30 mph (48.28 km/h)32.24 mph (51.89 km/h)
35 mph (56.33 km/h)37.61 mph (60.54 km/h)
40 mph (64.37 km/h)42.99 mph (69.18 km/h)
45 mph (72.42 km/h)48.36 mph (77.83 km/h)
50 mph (80.47 km/h)53.74 mph (86.48 km/h)
55 mph (88.51 km/h)59.11 mph (95.13 km/h)
60 mph (96.56 km/h)64.48 mph (103.77 km/h)
65 mph (104.61 km/h)69.86 mph (112.42 km/h)
70 mph (112.65 km/h)75.23 mph (121.07 km/h)
75 mph (120.7 km/h)80.6 mph (129.72 km/h)
80 mph (128.75 km/h)85.98 mph (138.37 km/h)
85 mph (136.79 km/h)91.35 mph (147.01 km/h)
90 mph (144.84 km/h)96.72 mph (155.66 km/h)
95 mph (152.89 km/h)102.1 mph (164.31 km/h)
100 mph (160.93 km/h)107.47 mph (172.96 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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