Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/45r16 vs 30/14.5r16 Tire Comparison Side By Side
  315/45-16 30/14.5-16 Difference
Diameter inches (mm) 27.16 (689.9) 29.91 (759.68) 2.75 (69.78) 10.1%
Width inches (mm) 12.4 (315) 14.49 (368) 2.09 (53) 16.8%
Circum. inches (mm) 85.33 (2167.38) 93.96 (2386.61) 8.63 (219.22) 10.1%
Sidewall Height inches (mm) 5.58 (141.75) 6.95 (176.64) 1.37 (34.89) 24.6%
Revolutions per mile (km) 742.53 (461.38) 674.32 (419) -68.2 (-42.38) -9.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.02 mph (35.44 km/h)
25 mph (40.23 km/h)27.53 mph (44.3 km/h)
30 mph (48.28 km/h)33.03 mph (53.16 km/h)
35 mph (56.33 km/h)38.54 mph (62.02 km/h)
40 mph (64.37 km/h)44.05 mph (70.88 km/h)
45 mph (72.42 km/h)49.55 mph (79.75 km/h)
50 mph (80.47 km/h)55.06 mph (88.61 km/h)
55 mph (88.51 km/h)60.56 mph (97.47 km/h)
60 mph (96.56 km/h)66.07 mph (106.33 km/h)
65 mph (104.61 km/h)71.57 mph (115.19 km/h)
70 mph (112.65 km/h)77.08 mph (124.05 km/h)
75 mph (120.7 km/h)82.59 mph (132.91 km/h)
80 mph (128.75 km/h)88.09 mph (141.77 km/h)
85 mph (136.79 km/h)93.6 mph (150.63 km/h)
90 mph (144.84 km/h)99.1 mph (159.49 km/h)
95 mph (152.89 km/h)104.61 mph (168.35 km/h)
100 mph (160.93 km/h)110.11 mph (177.21 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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