Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/70r15 vs 235/75r15 Tire Comparison Side By Side
  195/70-15 235/75-15 Difference
Diameter inches (mm) 25.75 (654) 28.88 (733.5) 3.13 (79.5) 12.2%
Width inches (mm) 7.68 (195) 9.25 (235) 1.57 (40) 20.5%
Circum. inches (mm) 80.89 (2054.6) 90.72 (2304.36) 9.83 (249.76) 12.2%
Sidewall Height inches (mm) 5.37 (136.5) 6.94 (176.25) 1.56 (39.75) 29.1%
Revolutions per mile (km) 783.29 (486.71) 698.39 (433.96) -84.9 (-52.75) -10.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.43 mph (36.1 km/h)
25 mph (40.23 km/h)28.04 mph (45.12 km/h)
30 mph (48.28 km/h)33.65 mph (54.15 km/h)
35 mph (56.33 km/h)39.25 mph (63.17 km/h)
40 mph (64.37 km/h)44.86 mph (72.2 km/h)
45 mph (72.42 km/h)50.47 mph (81.22 km/h)
50 mph (80.47 km/h)56.08 mph (90.25 km/h)
55 mph (88.51 km/h)61.69 mph (99.27 km/h)
60 mph (96.56 km/h)67.29 mph (108.3 km/h)
65 mph (104.61 km/h)72.9 mph (117.32 km/h)
70 mph (112.65 km/h)78.51 mph (126.35 km/h)
75 mph (120.7 km/h)84.12 mph (135.37 km/h)
80 mph (128.75 km/h)89.72 mph (144.4 km/h)
85 mph (136.79 km/h)95.33 mph (153.42 km/h)
90 mph (144.84 km/h)100.94 mph (162.45 km/h)
95 mph (152.89 km/h)106.55 mph (171.47 km/h)
100 mph (160.93 km/h)112.16 mph (180.5 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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