Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/40r17 vs 235/40r17 Tire Comparison Side By Side
  245/40-17 235/40-17 Difference
Diameter inches (mm) 24.72 (627.8) 24.4 (619.8) -0.31 (-8) -1.3%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 77.65 (1972.29) 76.66 (1947.16) -0.99 (-25.13) -1.3%
Sidewall Height inches (mm) 3.86 (98) 3.7 (94) -0.16 (-4) -4.1%
Revolutions per mile (km) 815.98 (507.02) 826.51 (513.57) 10.53 (6.54) 1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.75 mph (31.78 km/h)
25 mph (40.23 km/h)24.68 mph (39.72 km/h)
30 mph (48.28 km/h)29.62 mph (47.67 km/h)
35 mph (56.33 km/h)34.55 mph (55.61 km/h)
40 mph (64.37 km/h)39.49 mph (63.55 km/h)
45 mph (72.42 km/h)44.43 mph (71.5 km/h)
50 mph (80.47 km/h)49.36 mph (79.44 km/h)
55 mph (88.51 km/h)54.3 mph (87.39 km/h)
60 mph (96.56 km/h)59.24 mph (95.33 km/h)
65 mph (104.61 km/h)64.17 mph (103.27 km/h)
70 mph (112.65 km/h)69.11 mph (111.22 km/h)
75 mph (120.7 km/h)74.04 mph (119.16 km/h)
80 mph (128.75 km/h)78.98 mph (127.11 km/h)
85 mph (136.79 km/h)83.92 mph (135.05 km/h)
90 mph (144.84 km/h)88.85 mph (143 km/h)
95 mph (152.89 km/h)93.79 mph (150.94 km/h)
100 mph (160.93 km/h)98.73 mph (158.88 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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