Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r10 vs 145/80r13 Tire Comparison Side By Side
  145/80-10 145/80-13 Difference
Diameter inches (mm) 19.13 (486) 22.13 (562.2) 3 (76.2) 15.7%
Width inches (mm) 5.71 (145) 5.71 (145) 0 (0) 0%
Circum. inches (mm) 60.11 (1526.81) 69.54 (1766.2) 9.42 (239.39) 15.7%
Sidewall Height inches (mm) 4.57 (116) 4.57 (116) 0 (0) 0%
Revolutions per mile (km) 1054.05 (654.96) 911.19 (566.19) -142.87 (-88.77) -13.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.14 mph (37.23 km/h)
25 mph (40.23 km/h)28.92 mph (46.54 km/h)
30 mph (48.28 km/h)34.7 mph (55.85 km/h)
35 mph (56.33 km/h)40.49 mph (65.16 km/h)
40 mph (64.37 km/h)46.27 mph (74.47 km/h)
45 mph (72.42 km/h)52.06 mph (83.78 km/h)
50 mph (80.47 km/h)57.84 mph (93.08 km/h)
55 mph (88.51 km/h)63.62 mph (102.39 km/h)
60 mph (96.56 km/h)69.41 mph (111.7 km/h)
65 mph (104.61 km/h)75.19 mph (121.01 km/h)
70 mph (112.65 km/h)80.98 mph (130.32 km/h)
75 mph (120.7 km/h)86.76 mph (139.63 km/h)
80 mph (128.75 km/h)92.54 mph (148.93 km/h)
85 mph (136.79 km/h)98.33 mph (158.24 km/h)
90 mph (144.84 km/h)104.11 mph (167.55 km/h)
95 mph (152.89 km/h)109.9 mph (176.86 km/h)
100 mph (160.93 km/h)115.68 mph (186.17 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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