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 165/60r13 Tire Comparison Side By Side
  145/60-13 165/60-13 Difference
Diameter inches (mm) 19.85 (504.2) 20.8 (528.2) 0.94 (24) 4.8%
Width inches (mm) 5.71 (145) 6.5 (165) 0.79 (20) 13.8%
Circum. inches (mm) 62.36 (1583.99) 65.33 (1659.39) 2.97 (75.4) 4.8%
Sidewall Height inches (mm) 3.43 (87) 3.9 (99) 0.47 (12) 13.8%
Revolutions per mile (km) 1016.01 (631.32) 969.84 (602.63) -46.16 (-28.69) -4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.95 mph (33.72 km/h)
25 mph (40.23 km/h)26.19 mph (42.15 km/h)
30 mph (48.28 km/h)31.43 mph (50.58 km/h)
35 mph (56.33 km/h)36.67 mph (59.01 km/h)
40 mph (64.37 km/h)41.9 mph (67.44 km/h)
45 mph (72.42 km/h)47.14 mph (75.87 km/h)
50 mph (80.47 km/h)52.38 mph (84.3 km/h)
55 mph (88.51 km/h)57.62 mph (92.73 km/h)
60 mph (96.56 km/h)62.86 mph (101.16 km/h)
65 mph (104.61 km/h)68.09 mph (109.59 km/h)
70 mph (112.65 km/h)73.33 mph (118.02 km/h)
75 mph (120.7 km/h)78.57 mph (126.45 km/h)
80 mph (128.75 km/h)83.81 mph (134.88 km/h)
85 mph (136.79 km/h)89.05 mph (143.31 km/h)
90 mph (144.84 km/h)94.28 mph (151.74 km/h)
95 mph (152.89 km/h)99.52 mph (160.17 km/h)
100 mph (160.93 km/h)104.76 mph (168.6 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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