Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r15 vs 195/60r15 Tire Comparison Side By Side
  215/40-15 195/60-15 Difference
Diameter inches (mm) 21.77 (553) 24.21 (615) 2.44 (62) 11.2%
Width inches (mm) 8.46 (215) 7.68 (195) -0.79 (-20) -9.3%
Circum. inches (mm) 68.4 (1737.3) 76.07 (1932.08) 7.67 (194.78) 11.2%
Sidewall Height inches (mm) 3.39 (86) 4.61 (117) 1.22 (31) 36%
Revolutions per mile (km) 926.35 (575.6) 832.96 (517.58) -93.39 (-58.03) -10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.24 mph (35.8 km/h)
25 mph (40.23 km/h)27.8 mph (44.74 km/h)
30 mph (48.28 km/h)33.36 mph (53.69 km/h)
35 mph (56.33 km/h)38.92 mph (62.64 km/h)
40 mph (64.37 km/h)44.48 mph (71.59 km/h)
45 mph (72.42 km/h)50.05 mph (80.54 km/h)
50 mph (80.47 km/h)55.61 mph (89.49 km/h)
55 mph (88.51 km/h)61.17 mph (98.44 km/h)
60 mph (96.56 km/h)66.73 mph (107.39 km/h)
65 mph (104.61 km/h)72.29 mph (116.34 km/h)
70 mph (112.65 km/h)77.85 mph (125.28 km/h)
75 mph (120.7 km/h)83.41 mph (134.23 km/h)
80 mph (128.75 km/h)88.97 mph (143.18 km/h)
85 mph (136.79 km/h)94.53 mph (152.13 km/h)
90 mph (144.84 km/h)100.09 mph (161.08 km/h)
95 mph (152.89 km/h)105.65 mph (170.03 km/h)
100 mph (160.93 km/h)111.21 mph (178.98 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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