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 235/40r17 Tire Comparison Side By Side
  215/45-17 235/40-17 Difference
Diameter inches (mm) 24.62 (625.3) 24.4 (619.8) -0.22 (-5.5) -0.9%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 77.34 (1964.44) 76.66 (1947.16) -0.68 (-17.28) -0.9%
Sidewall Height inches (mm) 3.81 (96.75) 3.7 (94) -0.11 (-2.75) -2.8%
Revolutions per mile (km) 819.24 (509.05) 826.51 (513.57) 7.27 (4.52) 0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.82 mph (31.9 km/h)
25 mph (40.23 km/h)24.78 mph (39.88 km/h)
30 mph (48.28 km/h)29.74 mph (47.86 km/h)
35 mph (56.33 km/h)34.69 mph (55.83 km/h)
40 mph (64.37 km/h)39.65 mph (63.81 km/h)
45 mph (72.42 km/h)44.6 mph (71.78 km/h)
50 mph (80.47 km/h)49.56 mph (79.76 km/h)
55 mph (88.51 km/h)54.52 mph (87.74 km/h)
60 mph (96.56 km/h)59.47 mph (95.71 km/h)
65 mph (104.61 km/h)64.43 mph (103.69 km/h)
70 mph (112.65 km/h)69.38 mph (111.66 km/h)
75 mph (120.7 km/h)74.34 mph (119.64 km/h)
80 mph (128.75 km/h)79.3 mph (127.62 km/h)
85 mph (136.79 km/h)84.25 mph (135.59 km/h)
90 mph (144.84 km/h)89.21 mph (143.57 km/h)
95 mph (152.89 km/h)94.16 mph (151.54 km/h)
100 mph (160.93 km/h)99.12 mph (159.52 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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