Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r13 vs 155/50r13 Tire Comparison Side By Side
  145/60-13 155/50-13 Difference
Diameter inches (mm) 19.85 (504.2) 19.1 (485.2) -0.75 (-19) -3.8%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 62.36 (1583.99) 60.01 (1524.3) -2.35 (-59.69) -3.8%
Sidewall Height inches (mm) 3.43 (87) 3.05 (77.5) -0.37 (-9.5) -10.9%
Revolutions per mile (km) 1016.01 (631.32) 1055.79 (656.04) 39.79 (24.72) 3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.25 mph (30.97 km/h)
25 mph (40.23 km/h)24.06 mph (38.72 km/h)
30 mph (48.28 km/h)28.87 mph (46.46 km/h)
35 mph (56.33 km/h)33.68 mph (54.2 km/h)
40 mph (64.37 km/h)38.49 mph (61.95 km/h)
45 mph (72.42 km/h)43.3 mph (69.69 km/h)
50 mph (80.47 km/h)48.12 mph (77.44 km/h)
55 mph (88.51 km/h)52.93 mph (85.18 km/h)
60 mph (96.56 km/h)57.74 mph (92.92 km/h)
65 mph (104.61 km/h)62.55 mph (100.67 km/h)
70 mph (112.65 km/h)67.36 mph (108.41 km/h)
75 mph (120.7 km/h)72.17 mph (116.15 km/h)
80 mph (128.75 km/h)76.99 mph (123.9 km/h)
85 mph (136.79 km/h)81.8 mph (131.64 km/h)
90 mph (144.84 km/h)86.61 mph (139.38 km/h)
95 mph (152.89 km/h)91.42 mph (147.13 km/h)
100 mph (160.93 km/h)96.23 mph (154.87 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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