Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r17 vs 235/75r17 Tire Comparison Side By Side
  245/75-17 235/75-17 Difference
Diameter inches (mm) 31.47 (799.3) 30.88 (784.3) -0.59 (-15) -1.9%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 98.86 (2511.08) 97.01 (2463.95) -1.86 (-47.12) -1.9%
Sidewall Height inches (mm) 7.23 (183.75) 6.94 (176.25) -0.3 (-7.5) -4.1%
Revolutions per mile (km) 640.9 (398.24) 653.16 (405.85) 12.26 (7.62) 1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.62 mph (31.58 km/h)
25 mph (40.23 km/h)24.53 mph (39.48 km/h)
30 mph (48.28 km/h)29.44 mph (47.37 km/h)
35 mph (56.33 km/h)34.34 mph (55.27 km/h)
40 mph (64.37 km/h)39.25 mph (63.17 km/h)
45 mph (72.42 km/h)44.16 mph (71.06 km/h)
50 mph (80.47 km/h)49.06 mph (78.96 km/h)
55 mph (88.51 km/h)53.97 mph (86.85 km/h)
60 mph (96.56 km/h)58.87 mph (94.75 km/h)
65 mph (104.61 km/h)63.78 mph (102.64 km/h)
70 mph (112.65 km/h)68.69 mph (110.54 km/h)
75 mph (120.7 km/h)73.59 mph (118.44 km/h)
80 mph (128.75 km/h)78.5 mph (126.33 km/h)
85 mph (136.79 km/h)83.4 mph (134.23 km/h)
90 mph (144.84 km/h)88.31 mph (142.12 km/h)
95 mph (152.89 km/h)93.22 mph (150.02 km/h)
100 mph (160.93 km/h)98.12 mph (157.91 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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