Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/60r20 vs 295/60r20 Tire Comparison Side By Side
  315/60-20 295/60-20 Difference
Diameter inches (mm) 34.88 (886) 33.94 (862) -0.94 (-24) -2.7%
Width inches (mm) 12.4 (315) 11.61 (295) -0.79 (-20) -6.3%
Circum. inches (mm) 109.58 (2783.45) 106.62 (2708.05) -2.97 (-75.4) -2.7%
Sidewall Height inches (mm) 7.44 (189) 6.97 (177) -0.47 (-12) -6.3%
Revolutions per mile (km) 578.18 (359.27) 594.28 (369.27) 16.1 (10) 2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.46 mph (31.32 km/h)
25 mph (40.23 km/h)24.32 mph (39.14 km/h)
30 mph (48.28 km/h)29.19 mph (46.97 km/h)
35 mph (56.33 km/h)34.05 mph (54.8 km/h)
40 mph (64.37 km/h)38.92 mph (62.63 km/h)
45 mph (72.42 km/h)43.78 mph (70.46 km/h)
50 mph (80.47 km/h)48.65 mph (78.29 km/h)
55 mph (88.51 km/h)53.51 mph (86.12 km/h)
60 mph (96.56 km/h)58.37 mph (93.95 km/h)
65 mph (104.61 km/h)63.24 mph (101.77 km/h)
70 mph (112.65 km/h)68.1 mph (109.6 km/h)
75 mph (120.7 km/h)72.97 mph (117.43 km/h)
80 mph (128.75 km/h)77.83 mph (125.26 km/h)
85 mph (136.79 km/h)82.7 mph (133.09 km/h)
90 mph (144.84 km/h)87.56 mph (140.92 km/h)
95 mph (152.89 km/h)92.43 mph (148.75 km/h)
100 mph (160.93 km/h)97.29 mph (156.58 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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