Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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175/90r18 vs 275/90r18 Tire Comparison Side By Side
  175/90-18 275/90-18 Difference
Diameter inches (mm) 30.4 (772.2) 37.49 (952.2) 7.09 (180) 23.3%
Width inches (mm) 6.89 (175) 10.83 (275) 3.94 (100) 57.1%
Circum. inches (mm) 95.51 (2425.94) 117.77 (2991.42) 22.26 (565.49) 23.3%
Sidewall Height inches (mm) 6.2 (157.5) 9.74 (247.5) 3.54 (90) 57.1%
Revolutions per mile (km) 663.39 (412.21) 537.99 (334.29) -125.4 (-77.92) -18.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.66 mph (39.69 km/h)
25 mph (40.23 km/h)30.83 mph (49.61 km/h)
30 mph (48.28 km/h)36.99 mph (59.53 km/h)
35 mph (56.33 km/h)43.16 mph (69.46 km/h)
40 mph (64.37 km/h)49.32 mph (79.38 km/h)
45 mph (72.42 km/h)55.49 mph (89.3 km/h)
50 mph (80.47 km/h)61.66 mph (99.22 km/h)
55 mph (88.51 km/h)67.82 mph (109.15 km/h)
60 mph (96.56 km/h)73.99 mph (119.07 km/h)
65 mph (104.61 km/h)80.15 mph (128.99 km/h)
70 mph (112.65 km/h)86.32 mph (138.91 km/h)
75 mph (120.7 km/h)92.48 mph (148.84 km/h)
80 mph (128.75 km/h)98.65 mph (158.76 km/h)
85 mph (136.79 km/h)104.81 mph (168.68 km/h)
90 mph (144.84 km/h)110.98 mph (178.6 km/h)
95 mph (152.89 km/h)117.14 mph (188.53 km/h)
100 mph (160.93 km/h)123.31 mph (198.45 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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