Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/70r17 vs 315/75r16 Tire Comparison Side By Side
  265/70-17 315/75-16 Difference
Diameter inches (mm) 31.61 (802.8) 34.6 (878.9) 3 (76.1) 9.5%
Width inches (mm) 10.43 (265) 12.4 (315) 1.97 (50) 18.9%
Circum. inches (mm) 99.29 (2522.07) 108.71 (2761.15) 9.41 (239.08) 9.5%
Sidewall Height inches (mm) 7.3 (185.5) 9.3 (236.25) 2 (50.75) 27.4%
Revolutions per mile (km) 638.1 (396.5) 582.85 (362.17) -55.25 (-34.33) -8.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.9 mph (35.24 km/h)
25 mph (40.23 km/h)27.37 mph (44.05 km/h)
30 mph (48.28 km/h)32.84 mph (52.86 km/h)
35 mph (56.33 km/h)38.32 mph (61.67 km/h)
40 mph (64.37 km/h)43.79 mph (70.48 km/h)
45 mph (72.42 km/h)49.27 mph (79.29 km/h)
50 mph (80.47 km/h)54.74 mph (88.1 km/h)
55 mph (88.51 km/h)60.21 mph (96.9 km/h)
60 mph (96.56 km/h)65.69 mph (105.71 km/h)
65 mph (104.61 km/h)71.16 mph (114.52 km/h)
70 mph (112.65 km/h)76.64 mph (123.33 km/h)
75 mph (120.7 km/h)82.11 mph (132.14 km/h)
80 mph (128.75 km/h)87.58 mph (140.95 km/h)
85 mph (136.79 km/h)93.06 mph (149.76 km/h)
90 mph (144.84 km/h)98.53 mph (158.57 km/h)
95 mph (152.89 km/h)104.01 mph (167.38 km/h)
100 mph (160.93 km/h)109.48 mph (176.19 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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