Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/40r19 vs 275/45r18 Tire Comparison Side By Side
  315/40-19 275/45-18 Difference
Diameter inches (mm) 28.92 (734.6) 27.74 (704.7) -1.18 (-29.9) -4.1%
Width inches (mm) 12.4 (315) 10.83 (275) -1.57 (-40) -12.7%
Circum. inches (mm) 90.86 (2307.81) 87.16 (2213.88) -3.7 (-93.93) -4.1%
Sidewall Height inches (mm) 4.96 (126) 4.87 (123.75) -0.09 (-2.25) -1.8%
Revolutions per mile (km) 697.35 (433.31) 726.93 (451.69) 29.59 (18.39) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.19 mph (30.88 km/h)
25 mph (40.23 km/h)23.98 mph (38.6 km/h)
30 mph (48.28 km/h)28.78 mph (46.32 km/h)
35 mph (56.33 km/h)33.58 mph (54.03 km/h)
40 mph (64.37 km/h)38.37 mph (61.75 km/h)
45 mph (72.42 km/h)43.17 mph (69.47 km/h)
50 mph (80.47 km/h)47.96 mph (77.19 km/h)
55 mph (88.51 km/h)52.76 mph (84.91 km/h)
60 mph (96.56 km/h)57.56 mph (92.63 km/h)
65 mph (104.61 km/h)62.35 mph (100.35 km/h)
70 mph (112.65 km/h)67.15 mph (108.07 km/h)
75 mph (120.7 km/h)71.95 mph (115.79 km/h)
80 mph (128.75 km/h)76.74 mph (123.51 km/h)
85 mph (136.79 km/h)81.54 mph (131.23 km/h)
90 mph (144.84 km/h)86.34 mph (138.95 km/h)
95 mph (152.89 km/h)91.13 mph (146.67 km/h)
100 mph (160.93 km/h)95.93 mph (154.38 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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