Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/25r20 vs 315/60r20 Tire Comparison Side By Side
  325/25-20 315/60-20 Difference
Diameter inches (mm) 26.4 (670.5) 34.88 (886) 8.48 (215.5) 32.1%
Width inches (mm) 12.8 (325) 12.4 (315) -0.39 (-10) -3.1%
Circum. inches (mm) 82.93 (2106.44) 109.58 (2783.45) 26.65 (677.01) 32.1%
Sidewall Height inches (mm) 3.2 (81.25) 7.44 (189) 4.24 (107.75) 132.6%
Revolutions per mile (km) 764.01 (474.73) 578.18 (359.27) -185.83 (-115.47) -24.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)26.43 mph (42.53 km/h)
25 mph (40.23 km/h)33.04 mph (53.16 km/h)
30 mph (48.28 km/h)39.64 mph (63.8 km/h)
35 mph (56.33 km/h)46.25 mph (74.43 km/h)
40 mph (64.37 km/h)52.86 mph (85.06 km/h)
45 mph (72.42 km/h)59.46 mph (95.7 km/h)
50 mph (80.47 km/h)66.07 mph (106.33 km/h)
55 mph (88.51 km/h)72.68 mph (116.96 km/h)
60 mph (96.56 km/h)79.28 mph (127.6 km/h)
65 mph (104.61 km/h)85.89 mph (138.23 km/h)
70 mph (112.65 km/h)92.5 mph (148.86 km/h)
75 mph (120.7 km/h)99.11 mph (159.49 km/h)
80 mph (128.75 km/h)105.71 mph (170.13 km/h)
85 mph (136.79 km/h)112.32 mph (180.76 km/h)
90 mph (144.84 km/h)118.93 mph (191.39 km/h)
95 mph (152.89 km/h)125.53 mph (202.03 km/h)
100 mph (160.93 km/h)132.14 mph (212.66 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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