Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r15 vs 195/65r15 Tire Comparison Side By Side
  125/70-15 195/65-15 Difference
Diameter inches (mm) 21.89 (556) 24.98 (634.5) 3.09 (78.5) 14.1%
Width inches (mm) 4.92 (125) 7.68 (195) 2.76 (70) 56%
Circum. inches (mm) 68.77 (1746.73) 78.48 (1993.34) 9.71 (246.62) 14.1%
Sidewall Height inches (mm) 3.44 (87.5) 4.99 (126.75) 1.55 (39.25) 44.9%
Revolutions per mile (km) 921.35 (572.5) 807.36 (501.67) -113.99 (-70.83) -12.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.82 mph (36.73 km/h)
25 mph (40.23 km/h)28.53 mph (45.91 km/h)
30 mph (48.28 km/h)34.24 mph (55.1 km/h)
35 mph (56.33 km/h)39.94 mph (64.28 km/h)
40 mph (64.37 km/h)45.65 mph (73.46 km/h)
45 mph (72.42 km/h)51.35 mph (82.65 km/h)
50 mph (80.47 km/h)57.06 mph (91.83 km/h)
55 mph (88.51 km/h)62.77 mph (101.01 km/h)
60 mph (96.56 km/h)68.47 mph (110.19 km/h)
65 mph (104.61 km/h)74.18 mph (119.38 km/h)
70 mph (112.65 km/h)79.88 mph (128.56 km/h)
75 mph (120.7 km/h)85.59 mph (137.74 km/h)
80 mph (128.75 km/h)91.29 mph (146.93 km/h)
85 mph (136.79 km/h)97 mph (156.11 km/h)
90 mph (144.84 km/h)102.71 mph (165.29 km/h)
95 mph (152.89 km/h)108.41 mph (174.47 km/h)
100 mph (160.93 km/h)114.12 mph (183.66 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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