Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/45r17 vs 245/40r17 Tire Comparison Side By Side
  235/45-17 245/40-17 Difference
Diameter inches (mm) 25.33 (643.3) 24.72 (627.8) -0.61 (-15.5) -2.4%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 79.57 (2020.99) 77.65 (1972.29) -1.92 (-48.69) -2.4%
Sidewall Height inches (mm) 4.16 (105.75) 3.86 (98) -0.31 (-7.75) -7.3%
Revolutions per mile (km) 796.32 (494.81) 815.98 (507.02) 19.66 (12.22) 2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.52 mph (31.41 km/h)
25 mph (40.23 km/h)24.4 mph (39.26 km/h)
30 mph (48.28 km/h)29.28 mph (47.12 km/h)
35 mph (56.33 km/h)34.16 mph (54.97 km/h)
40 mph (64.37 km/h)39.04 mph (62.82 km/h)
45 mph (72.42 km/h)43.92 mph (70.68 km/h)
50 mph (80.47 km/h)48.8 mph (78.53 km/h)
55 mph (88.51 km/h)53.67 mph (86.38 km/h)
60 mph (96.56 km/h)58.55 mph (94.23 km/h)
65 mph (104.61 km/h)63.43 mph (102.09 km/h)
70 mph (112.65 km/h)68.31 mph (109.94 km/h)
75 mph (120.7 km/h)73.19 mph (117.79 km/h)
80 mph (128.75 km/h)78.07 mph (125.65 km/h)
85 mph (136.79 km/h)82.95 mph (133.5 km/h)
90 mph (144.84 km/h)87.83 mph (141.35 km/h)
95 mph (152.89 km/h)92.71 mph (149.2 km/h)
100 mph (160.93 km/h)97.59 mph (157.06 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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