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 28/10r17 Tire Comparison Side By Side
  315/40-19 28/10-17 Difference
Diameter inches (mm) 28.92 (734.6) 28 (711.2) -0.92 (-23.4) -3.2%
Width inches (mm) 12.4 (315) 10 (254) -2.4 (-61) -19.4%
Circum. inches (mm) 90.86 (2307.81) 87.96 (2234.3) -2.89 (-73.51) -3.2%
Sidewall Height inches (mm) 4.96 (126) 5.5 (139.7) 0.54 (13.7) 10.9%
Revolutions per mile (km) 697.35 (433.31) 720.29 (447.57) 22.94 (14.26) 3.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.36 mph (31.16 km/h)
25 mph (40.23 km/h)24.2 mph (38.95 km/h)
30 mph (48.28 km/h)29.04 mph (46.74 km/h)
35 mph (56.33 km/h)33.89 mph (54.53 km/h)
40 mph (64.37 km/h)38.73 mph (62.32 km/h)
45 mph (72.42 km/h)43.57 mph (70.11 km/h)
50 mph (80.47 km/h)48.41 mph (77.9 km/h)
55 mph (88.51 km/h)53.25 mph (85.69 km/h)
60 mph (96.56 km/h)58.09 mph (93.48 km/h)
65 mph (104.61 km/h)62.93 mph (101.28 km/h)
70 mph (112.65 km/h)67.77 mph (109.07 km/h)
75 mph (120.7 km/h)72.61 mph (116.86 km/h)
80 mph (128.75 km/h)77.45 mph (124.65 km/h)
85 mph (136.79 km/h)82.29 mph (132.44 km/h)
90 mph (144.84 km/h)87.13 mph (140.23 km/h)
95 mph (152.89 km/h)91.97 mph (148.02 km/h)
100 mph (160.93 km/h)96.81 mph (155.81 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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