Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/60r15 vs 235/75r15 Tire Comparison Side By Side
  245/60-15 235/75-15 Difference
Diameter inches (mm) 26.57 (675) 28.88 (733.5) 2.3 (58.5) 8.7%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 83.49 (2120.58) 90.72 (2304.36) 7.24 (183.78) 8.7%
Sidewall Height inches (mm) 5.79 (147) 6.94 (176.25) 1.15 (29.25) 19.9%
Revolutions per mile (km) 758.92 (471.57) 698.39 (433.96) -60.53 (-37.61) -8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.73 mph (34.98 km/h)
25 mph (40.23 km/h)27.17 mph (43.72 km/h)
30 mph (48.28 km/h)32.6 mph (52.46 km/h)
35 mph (56.33 km/h)38.03 mph (61.21 km/h)
40 mph (64.37 km/h)43.47 mph (69.95 km/h)
45 mph (72.42 km/h)48.9 mph (78.7 km/h)
50 mph (80.47 km/h)54.33 mph (87.44 km/h)
55 mph (88.51 km/h)59.77 mph (96.19 km/h)
60 mph (96.56 km/h)65.2 mph (104.93 km/h)
65 mph (104.61 km/h)70.63 mph (113.67 km/h)
70 mph (112.65 km/h)76.07 mph (122.42 km/h)
75 mph (120.7 km/h)81.5 mph (131.16 km/h)
80 mph (128.75 km/h)86.93 mph (139.91 km/h)
85 mph (136.79 km/h)92.37 mph (148.65 km/h)
90 mph (144.84 km/h)97.8 mph (157.39 km/h)
95 mph (152.89 km/h)103.23 mph (166.14 km/h)
100 mph (160.93 km/h)108.67 mph (174.88 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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