Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/30r30 vs 265/75r16 Tire Comparison Side By Side
  315/30-30 265/75-16 Difference
Diameter inches (mm) 37.44 (951) 31.65 (803.9) -5.79 (-147.1) -15.5%
Width inches (mm) 12.4 (315) 10.43 (265) -1.97 (-50) -15.9%
Circum. inches (mm) 117.62 (2987.65) 99.43 (2525.53) -18.19 (-462.13) -15.5%
Sidewall Height inches (mm) 3.72 (94.5) 7.82 (198.75) 4.1 (104.25) 110.3%
Revolutions per mile (km) 538.66 (334.71) 637.23 (395.96) 98.57 (61.25) 18.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)16.91 mph (27.21 km/h)
25 mph (40.23 km/h)21.13 mph (34.01 km/h)
30 mph (48.28 km/h)25.36 mph (40.81 km/h)
35 mph (56.33 km/h)29.59 mph (47.61 km/h)
40 mph (64.37 km/h)33.81 mph (54.42 km/h)
45 mph (72.42 km/h)38.04 mph (61.22 km/h)
50 mph (80.47 km/h)42.27 mph (68.02 km/h)
55 mph (88.51 km/h)46.49 mph (74.82 km/h)
60 mph (96.56 km/h)50.72 mph (81.62 km/h)
65 mph (104.61 km/h)54.95 mph (88.43 km/h)
70 mph (112.65 km/h)59.17 mph (95.23 km/h)
75 mph (120.7 km/h)63.4 mph (102.03 km/h)
80 mph (128.75 km/h)67.63 mph (108.83 km/h)
85 mph (136.79 km/h)71.85 mph (115.64 km/h)
90 mph (144.84 km/h)76.08 mph (122.44 km/h)
95 mph (152.89 km/h)80.31 mph (129.24 km/h)
100 mph (160.93 km/h)84.53 mph (136.04 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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