Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r15 vs 235/60r17 Tire Comparison Side By Side
  245/75-15 235/60-17 Difference
Diameter inches (mm) 29.47 (748.5) 28.1 (713.8) -1.37 (-34.7) -4.6%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 92.58 (2351.48) 88.29 (2242.47) -4.29 (-109.01) -4.6%
Sidewall Height inches (mm) 7.23 (183.75) 5.55 (141) -1.68 (-42.75) -23.3%
Revolutions per mile (km) 684.4 (425.26) 717.67 (445.94) 33.27 (20.67) 4.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.07 mph (30.69 km/h)
25 mph (40.23 km/h)23.84 mph (38.37 km/h)
30 mph (48.28 km/h)28.61 mph (46.04 km/h)
35 mph (56.33 km/h)33.38 mph (53.72 km/h)
40 mph (64.37 km/h)38.15 mph (61.39 km/h)
45 mph (72.42 km/h)42.91 mph (69.06 km/h)
50 mph (80.47 km/h)47.68 mph (76.74 km/h)
55 mph (88.51 km/h)52.45 mph (84.41 km/h)
60 mph (96.56 km/h)57.22 mph (92.08 km/h)
65 mph (104.61 km/h)61.99 mph (99.76 km/h)
70 mph (112.65 km/h)66.75 mph (107.43 km/h)
75 mph (120.7 km/h)71.52 mph (115.11 km/h)
80 mph (128.75 km/h)76.29 mph (122.78 km/h)
85 mph (136.79 km/h)81.06 mph (130.45 km/h)
90 mph (144.84 km/h)85.83 mph (138.13 km/h)
95 mph (152.89 km/h)90.6 mph (145.8 km/h)
100 mph (160.93 km/h)95.36 mph (153.47 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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