Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/80r16 vs 35/12.5r17 Tire Comparison Side By Side
  315/80-16 35/12.5-17 Difference
Diameter inches (mm) 35.84 (910.4) 35.03 (889.72) -0.81 (-20.68) -2.3%
Width inches (mm) 12.4 (315) 12.52 (318) 0.12 (3) 1%
Circum. inches (mm) 112.6 (2860.11) 110.04 (2795.14) -2.56 (-64.97) -2.3%
Sidewall Height inches (mm) 9.92 (252) 9.01 (228.96) -0.91 (-23.04) -9.1%
Revolutions per mile (km) 562.69 (349.64) 575.77 (357.76) 13.08 (8.13) 2.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.55 mph (31.46 km/h)
25 mph (40.23 km/h)24.43 mph (39.32 km/h)
30 mph (48.28 km/h)29.32 mph (47.18 km/h)
35 mph (56.33 km/h)34.2 mph (55.05 km/h)
40 mph (64.37 km/h)39.09 mph (62.91 km/h)
45 mph (72.42 km/h)43.98 mph (70.78 km/h)
50 mph (80.47 km/h)48.86 mph (78.64 km/h)
55 mph (88.51 km/h)53.75 mph (86.5 km/h)
60 mph (96.56 km/h)58.64 mph (94.37 km/h)
65 mph (104.61 km/h)63.52 mph (102.23 km/h)
70 mph (112.65 km/h)68.41 mph (110.1 km/h)
75 mph (120.7 km/h)73.3 mph (117.96 km/h)
80 mph (128.75 km/h)78.18 mph (125.82 km/h)
85 mph (136.79 km/h)83.07 mph (133.69 km/h)
90 mph (144.84 km/h)87.96 mph (141.55 km/h)
95 mph (152.89 km/h)92.84 mph (149.42 km/h)
100 mph (160.93 km/h)97.73 mph (157.28 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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