Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/80r13 vs 165/70r14 Tire Comparison Side By Side
  145/80-13 165/70-14 Difference
Diameter inches (mm) 22.13 (562.2) 23.09 (586.6) 0.96 (24.4) 4.3%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 69.54 (1766.2) 72.55 (1842.86) 3.02 (76.65) 4.3%
Sidewall Height inches (mm) 4.57 (116) 4.55 (115.5) -0.02 (-0.5) -0.4%
Revolutions per mile (km) 911.19 (566.19) 873.29 (542.63) -37.9 (-23.55) -4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.87 mph (33.58 km/h)
25 mph (40.23 km/h)26.09 mph (41.98 km/h)
30 mph (48.28 km/h)31.3 mph (50.38 km/h)
35 mph (56.33 km/h)36.52 mph (58.77 km/h)
40 mph (64.37 km/h)41.74 mph (67.17 km/h)
45 mph (72.42 km/h)46.95 mph (75.56 km/h)
50 mph (80.47 km/h)52.17 mph (83.96 km/h)
55 mph (88.51 km/h)57.39 mph (92.36 km/h)
60 mph (96.56 km/h)62.6 mph (100.75 km/h)
65 mph (104.61 km/h)67.82 mph (109.15 km/h)
70 mph (112.65 km/h)73.04 mph (117.54 km/h)
75 mph (120.7 km/h)78.26 mph (125.94 km/h)
80 mph (128.75 km/h)83.47 mph (134.34 km/h)
85 mph (136.79 km/h)88.69 mph (142.73 km/h)
90 mph (144.84 km/h)93.91 mph (151.13 km/h)
95 mph (152.89 km/h)99.12 mph (159.52 km/h)
100 mph (160.93 km/h)104.34 mph (167.92 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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