Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/40r17 vs 215/55r17 Tire Comparison Side By Side
  215/40-17 215/55-17 Difference
Diameter inches (mm) 23.77 (603.8) 26.31 (668.3) 2.54 (64.5) 10.7%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 74.68 (1896.89) 82.66 (2099.53) 7.98 (202.63) 10.7%
Sidewall Height inches (mm) 3.39 (86) 4.66 (118.25) 1.27 (32.25) 37.5%
Revolutions per mile (km) 848.41 (527.18) 766.53 (476.3) -81.88 (-50.88) -9.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.14 mph (35.63 km/h)
25 mph (40.23 km/h)27.67 mph (44.53 km/h)
30 mph (48.28 km/h)33.2 mph (53.44 km/h)
35 mph (56.33 km/h)38.74 mph (62.34 km/h)
40 mph (64.37 km/h)44.27 mph (71.25 km/h)
45 mph (72.42 km/h)49.81 mph (80.16 km/h)
50 mph (80.47 km/h)55.34 mph (89.06 km/h)
55 mph (88.51 km/h)60.88 mph (97.97 km/h)
60 mph (96.56 km/h)66.41 mph (106.88 km/h)
65 mph (104.61 km/h)71.94 mph (115.78 km/h)
70 mph (112.65 km/h)77.48 mph (124.69 km/h)
75 mph (120.7 km/h)83.01 mph (133.59 km/h)
80 mph (128.75 km/h)88.55 mph (142.5 km/h)
85 mph (136.79 km/h)94.08 mph (151.41 km/h)
90 mph (144.84 km/h)99.61 mph (160.31 km/h)
95 mph (152.89 km/h)105.15 mph (169.22 km/h)
100 mph (160.93 km/h)110.68 mph (178.13 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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