Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/60r19 vs 195/45r20 Tire Comparison Side By Side
  175/60-19 195/45-20 Difference
Diameter inches (mm) 27.27 (692.6) 26.91 (683.5) -0.36 (-9.1) -1.3%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 85.66 (2175.87) 84.54 (2147.28) -1.13 (-28.59) -1.3%
Sidewall Height inches (mm) 4.13 (105) 3.45 (87.75) -0.68 (-17.25) -16.4%
Revolutions per mile (km) 739.63 (459.59) 749.48 (465.7) 9.85 (6.12) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.74 mph (31.76 km/h)
25 mph (40.23 km/h)24.67 mph (39.71 km/h)
30 mph (48.28 km/h)29.61 mph (47.65 km/h)
35 mph (56.33 km/h)34.54 mph (55.59 km/h)
40 mph (64.37 km/h)39.47 mph (63.53 km/h)
45 mph (72.42 km/h)44.41 mph (71.47 km/h)
50 mph (80.47 km/h)49.34 mph (79.41 km/h)
55 mph (88.51 km/h)54.28 mph (87.35 km/h)
60 mph (96.56 km/h)59.21 mph (95.29 km/h)
65 mph (104.61 km/h)64.15 mph (103.23 km/h)
70 mph (112.65 km/h)69.08 mph (111.17 km/h)
75 mph (120.7 km/h)74.01 mph (119.12 km/h)
80 mph (128.75 km/h)78.95 mph (127.06 km/h)
85 mph (136.79 km/h)83.88 mph (135 km/h)
90 mph (144.84 km/h)88.82 mph (142.94 km/h)
95 mph (152.89 km/h)93.75 mph (150.88 km/h)
100 mph (160.93 km/h)98.69 mph (158.82 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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