Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r15 vs 195/65r15 Tire Comparison Side By Side
  125/80-15 195/65-15 Difference
Diameter inches (mm) 22.87 (581) 24.98 (634.5) 2.11 (53.5) 9.2%
Width inches (mm) 4.92 (125) 7.68 (195) 2.76 (70) 56%
Circum. inches (mm) 71.86 (1825.27) 78.48 (1993.34) 6.62 (168.08) 9.2%
Sidewall Height inches (mm) 3.94 (100) 4.99 (126.75) 1.05 (26.75) 26.8%
Revolutions per mile (km) 881.7 (547.86) 807.36 (501.67) -74.34 (-46.2) -8.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.84 mph (35.15 km/h)
25 mph (40.23 km/h)27.3 mph (43.94 km/h)
30 mph (48.28 km/h)32.76 mph (52.73 km/h)
35 mph (56.33 km/h)38.22 mph (61.51 km/h)
40 mph (64.37 km/h)43.68 mph (70.3 km/h)
45 mph (72.42 km/h)49.14 mph (79.09 km/h)
50 mph (80.47 km/h)54.6 mph (87.88 km/h)
55 mph (88.51 km/h)60.06 mph (96.66 km/h)
60 mph (96.56 km/h)65.52 mph (105.45 km/h)
65 mph (104.61 km/h)70.99 mph (114.24 km/h)
70 mph (112.65 km/h)76.45 mph (123.03 km/h)
75 mph (120.7 km/h)81.91 mph (131.82 km/h)
80 mph (128.75 km/h)87.37 mph (140.6 km/h)
85 mph (136.79 km/h)92.83 mph (149.39 km/h)
90 mph (144.84 km/h)98.29 mph (158.18 km/h)
95 mph (152.89 km/h)103.75 mph (166.97 km/h)
100 mph (160.93 km/h)109.21 mph (175.75 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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