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 205/35r15 Tire Comparison Side By Side
  215/40-15 205/35-15 Difference
Diameter inches (mm) 21.77 (553) 20.65 (524.5) -1.12 (-28.5) -5.2%
Width inches (mm) 8.46 (215) 8.07 (205) -0.39 (-10) -4.7%
Circum. inches (mm) 68.4 (1737.3) 64.87 (1647.77) -3.53 (-89.54) -5.2%
Sidewall Height inches (mm) 3.39 (86) 2.82 (71.75) -0.56 (-14.25) -16.6%
Revolutions per mile (km) 926.35 (575.6) 976.68 (606.88) 50.34 (31.28) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.97 mph (30.53 km/h)
25 mph (40.23 km/h)23.71 mph (38.16 km/h)
30 mph (48.28 km/h)28.45 mph (45.79 km/h)
35 mph (56.33 km/h)33.2 mph (53.42 km/h)
40 mph (64.37 km/h)37.94 mph (61.06 km/h)
45 mph (72.42 km/h)42.68 mph (68.69 km/h)
50 mph (80.47 km/h)47.42 mph (76.32 km/h)
55 mph (88.51 km/h)52.17 mph (83.95 km/h)
60 mph (96.56 km/h)56.91 mph (91.58 km/h)
65 mph (104.61 km/h)61.65 mph (99.22 km/h)
70 mph (112.65 km/h)66.39 mph (106.85 km/h)
75 mph (120.7 km/h)71.13 mph (114.48 km/h)
80 mph (128.75 km/h)75.88 mph (122.11 km/h)
85 mph (136.79 km/h)80.62 mph (129.74 km/h)
90 mph (144.84 km/h)85.36 mph (137.38 km/h)
95 mph (152.89 km/h)90.1 mph (145.01 km/h)
100 mph (160.93 km/h)94.85 mph (152.64 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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