Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/70r17 vs 215/75r15 Tire Comparison Side By Side
  195/70-17 215/75-15 Difference
Diameter inches (mm) 27.75 (704.8) 27.7 (703.5) -0.05 (-1.3) -0.2%
Width inches (mm) 7.68 (195) 8.46 (215) 0.79 (20) 10.3%
Circum. inches (mm) 87.17 (2214.19) 87.01 (2210.11) -0.16 (-4.08) -0.2%
Sidewall Height inches (mm) 5.37 (136.5) 6.35 (161.25) 0.97 (24.75) 18.1%
Revolutions per mile (km) 726.83 (451.63) 728.17 (452.47) 1.34 (0.83) 0.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.96 mph (32.13 km/h)
25 mph (40.23 km/h)24.95 mph (40.16 km/h)
30 mph (48.28 km/h)29.94 mph (48.19 km/h)
35 mph (56.33 km/h)34.94 mph (56.22 km/h)
40 mph (64.37 km/h)39.93 mph (64.26 km/h)
45 mph (72.42 km/h)44.92 mph (72.29 km/h)
50 mph (80.47 km/h)49.91 mph (80.32 km/h)
55 mph (88.51 km/h)54.9 mph (88.35 km/h)
60 mph (96.56 km/h)59.89 mph (96.38 km/h)
65 mph (104.61 km/h)64.88 mph (104.41 km/h)
70 mph (112.65 km/h)69.87 mph (112.45 km/h)
75 mph (120.7 km/h)74.86 mph (120.48 km/h)
80 mph (128.75 km/h)79.85 mph (128.51 km/h)
85 mph (136.79 km/h)84.84 mph (136.54 km/h)
90 mph (144.84 km/h)89.83 mph (144.57 km/h)
95 mph (152.89 km/h)94.82 mph (152.61 km/h)
100 mph (160.93 km/h)99.82 mph (160.64 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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