Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r16 vs 235/75r15 Tire Comparison Side By Side
  245/70-16 235/75-15 Difference
Diameter inches (mm) 29.5 (749.4) 28.88 (733.5) -0.63 (-15.9) -2.1%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 92.69 (2354.31) 90.72 (2304.36) -1.97 (-49.95) -2.1%
Sidewall Height inches (mm) 6.75 (171.5) 6.94 (176.25) 0.19 (4.75) 2.8%
Revolutions per mile (km) 683.57 (424.75) 698.39 (433.96) 14.82 (9.21) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.58 mph (31.5 km/h)
25 mph (40.23 km/h)24.47 mph (39.38 km/h)
30 mph (48.28 km/h)29.36 mph (47.26 km/h)
35 mph (56.33 km/h)34.26 mph (55.13 km/h)
40 mph (64.37 km/h)39.15 mph (63.01 km/h)
45 mph (72.42 km/h)44.05 mph (70.88 km/h)
50 mph (80.47 km/h)48.94 mph (78.76 km/h)
55 mph (88.51 km/h)53.83 mph (86.64 km/h)
60 mph (96.56 km/h)58.73 mph (94.51 km/h)
65 mph (104.61 km/h)63.62 mph (102.39 km/h)
70 mph (112.65 km/h)68.51 mph (110.26 km/h)
75 mph (120.7 km/h)73.41 mph (118.14 km/h)
80 mph (128.75 km/h)78.3 mph (126.02 km/h)
85 mph (136.79 km/h)83.2 mph (133.89 km/h)
90 mph (144.84 km/h)88.09 mph (141.77 km/h)
95 mph (152.89 km/h)92.98 mph (149.64 km/h)
100 mph (160.93 km/h)97.88 mph (157.52 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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