Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/50r15 vs 315/50r15 Tire Comparison Side By Side
  275/50-15 315/50-15 Difference
Diameter inches (mm) 25.83 (656) 27.4 (696) 1.57 (40) 6.1%
Width inches (mm) 10.83 (275) 12.4 (315) 1.57 (40) 14.5%
Circum. inches (mm) 81.14 (2060.88) 86.08 (2186.55) 4.95 (125.66) 6.1%
Sidewall Height inches (mm) 5.41 (137.5) 6.2 (157.5) 0.79 (20) 14.5%
Revolutions per mile (km) 780.9 (485.23) 736.02 (457.34) -44.88 (-27.89) -5.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.22 mph (34.15 km/h)
25 mph (40.23 km/h)26.52 mph (42.69 km/h)
30 mph (48.28 km/h)31.83 mph (51.22 km/h)
35 mph (56.33 km/h)37.13 mph (59.76 km/h)
40 mph (64.37 km/h)42.44 mph (68.3 km/h)
45 mph (72.42 km/h)47.74 mph (76.84 km/h)
50 mph (80.47 km/h)53.05 mph (85.37 km/h)
55 mph (88.51 km/h)58.35 mph (93.91 km/h)
60 mph (96.56 km/h)63.66 mph (102.45 km/h)
65 mph (104.61 km/h)68.96 mph (110.99 km/h)
70 mph (112.65 km/h)74.27 mph (119.52 km/h)
75 mph (120.7 km/h)79.57 mph (128.06 km/h)
80 mph (128.75 km/h)84.88 mph (136.6 km/h)
85 mph (136.79 km/h)90.18 mph (145.14 km/h)
90 mph (144.84 km/h)95.49 mph (153.67 km/h)
95 mph (152.89 km/h)100.79 mph (162.21 km/h)
100 mph (160.93 km/h)106.1 mph (170.75 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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