Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/60r15 vs 195/60r15 Tire Comparison Side By Side
  155/60-15 195/60-15 Difference
Diameter inches (mm) 22.32 (567) 24.21 (615) 1.89 (48) 8.5%
Width inches (mm) 6.1 (155) 7.68 (195) 1.57 (40) 25.8%
Circum. inches (mm) 70.13 (1781.28) 76.07 (1932.08) 5.94 (150.8) 8.5%
Sidewall Height inches (mm) 3.66 (93) 4.61 (117) 0.94 (24) 25.8%
Revolutions per mile (km) 903.47 (561.39) 832.96 (517.58) -70.52 (-43.82) -7.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.69 mph (34.91 km/h)
25 mph (40.23 km/h)27.12 mph (43.64 km/h)
30 mph (48.28 km/h)32.54 mph (52.37 km/h)
35 mph (56.33 km/h)37.96 mph (61.1 km/h)
40 mph (64.37 km/h)43.39 mph (69.82 km/h)
45 mph (72.42 km/h)48.81 mph (78.55 km/h)
50 mph (80.47 km/h)54.23 mph (87.28 km/h)
55 mph (88.51 km/h)59.66 mph (96.01 km/h)
60 mph (96.56 km/h)65.08 mph (104.74 km/h)
65 mph (104.61 km/h)70.5 mph (113.46 km/h)
70 mph (112.65 km/h)75.93 mph (122.19 km/h)
75 mph (120.7 km/h)81.35 mph (130.92 km/h)
80 mph (128.75 km/h)86.77 mph (139.65 km/h)
85 mph (136.79 km/h)92.2 mph (148.37 km/h)
90 mph (144.84 km/h)97.62 mph (157.1 km/h)
95 mph (152.89 km/h)103.04 mph (165.83 km/h)
100 mph (160.93 km/h)108.47 mph (174.56 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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