Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/45r17 vs 225/50r17 Tire Comparison Side By Side
  215/45-17 225/50-17 Difference
Diameter inches (mm) 24.62 (625.3) 25.86 (656.8) 1.24 (31.5) 5%
Width inches (mm) 8.46 (215) 8.86 (225) 0.39 (10) 4.7%
Circum. inches (mm) 77.34 (1964.44) 81.24 (2063.4) 3.9 (98.96) 5%
Sidewall Height inches (mm) 3.81 (96.75) 4.43 (112.5) 0.62 (15.75) 16.3%
Revolutions per mile (km) 819.24 (509.05) 779.95 (484.64) -39.29 (-24.41) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.01 mph (33.81 km/h)
25 mph (40.23 km/h)26.26 mph (42.26 km/h)
30 mph (48.28 km/h)31.51 mph (50.71 km/h)
35 mph (56.33 km/h)36.76 mph (59.16 km/h)
40 mph (64.37 km/h)42.02 mph (67.62 km/h)
45 mph (72.42 km/h)47.27 mph (76.07 km/h)
50 mph (80.47 km/h)52.52 mph (84.52 km/h)
55 mph (88.51 km/h)57.77 mph (92.97 km/h)
60 mph (96.56 km/h)63.02 mph (101.43 km/h)
65 mph (104.61 km/h)68.27 mph (109.88 km/h)
70 mph (112.65 km/h)73.53 mph (118.33 km/h)
75 mph (120.7 km/h)78.78 mph (126.78 km/h)
80 mph (128.75 km/h)84.03 mph (135.23 km/h)
85 mph (136.79 km/h)89.28 mph (143.69 km/h)
90 mph (144.84 km/h)94.53 mph (152.14 km/h)
95 mph (152.89 km/h)99.79 mph (160.59 km/h)
100 mph (160.93 km/h)105.04 mph (169.04 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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