Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
315/50r15 vs 295/65r15 Tire Comparison Side By Side
  315/50-15 295/65-15 Difference
Diameter inches (mm) 27.4 (696) 30.1 (764.5) 2.7 (68.5) 9.8%
Width inches (mm) 12.4 (315) 11.61 (295) -0.79 (-20) -6.3%
Circum. inches (mm) 86.08 (2186.55) 94.56 (2401.75) 8.47 (215.2) 9.8%
Sidewall Height inches (mm) 6.2 (157.5) 7.55 (191.75) 1.35 (34.25) 21.7%
Revolutions per mile (km) 736.02 (457.34) 670.07 (416.36) -65.95 (-40.98) -9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.97 mph (35.35 km/h)
25 mph (40.23 km/h)27.46 mph (44.19 km/h)
30 mph (48.28 km/h)32.95 mph (53.03 km/h)
35 mph (56.33 km/h)38.44 mph (61.87 km/h)
40 mph (64.37 km/h)43.94 mph (70.71 km/h)
45 mph (72.42 km/h)49.43 mph (79.55 km/h)
50 mph (80.47 km/h)54.92 mph (88.39 km/h)
55 mph (88.51 km/h)60.41 mph (97.23 km/h)
60 mph (96.56 km/h)65.91 mph (106.06 km/h)
65 mph (104.61 km/h)71.4 mph (114.9 km/h)
70 mph (112.65 km/h)76.89 mph (123.74 km/h)
75 mph (120.7 km/h)82.38 mph (132.58 km/h)
80 mph (128.75 km/h)87.87 mph (141.42 km/h)
85 mph (136.79 km/h)93.37 mph (150.26 km/h)
90 mph (144.84 km/h)98.86 mph (159.1 km/h)
95 mph (152.89 km/h)104.35 mph (167.94 km/h)
100 mph (160.93 km/h)109.84 mph (176.77 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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