Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/75r17 vs 235/75r17.5 Tire Comparison Side By Side
  215/75-17 235/75-17.5 Difference
Diameter inches (mm) 29.7 (754.3) 31.38 (797) 1.68 (42.7) 5.7%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 93.3 (2369.7) 98.58 (2503.85) 5.28 (134.15) 5.7%
Sidewall Height inches (mm) 6.35 (161.25) 6.94 (176.25) 0.59 (15) 9.3%
Revolutions per mile (km) 679.13 (421.99) 642.75 (399.38) -36.39 (-22.61) -5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.13 mph (34.01 km/h)
25 mph (40.23 km/h)26.42 mph (42.51 km/h)
30 mph (48.28 km/h)31.7 mph (51.01 km/h)
35 mph (56.33 km/h)36.98 mph (59.52 km/h)
40 mph (64.37 km/h)42.26 mph (68.02 km/h)
45 mph (72.42 km/h)47.55 mph (76.52 km/h)
50 mph (80.47 km/h)52.83 mph (85.02 km/h)
55 mph (88.51 km/h)58.11 mph (93.52 km/h)
60 mph (96.56 km/h)63.4 mph (102.03 km/h)
65 mph (104.61 km/h)68.68 mph (110.53 km/h)
70 mph (112.65 km/h)73.96 mph (119.03 km/h)
75 mph (120.7 km/h)79.25 mph (127.53 km/h)
80 mph (128.75 km/h)84.53 mph (136.04 km/h)
85 mph (136.79 km/h)89.81 mph (144.54 km/h)
90 mph (144.84 km/h)95.09 mph (153.04 km/h)
95 mph (152.89 km/h)100.38 mph (161.54 km/h)
100 mph (160.93 km/h)105.66 mph (170.05 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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