Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/60r15 vs 145/60r15 Tire Comparison Side By Side
  155/60-15 145/60-15 Difference
Diameter inches (mm) 22.32 (567) 21.85 (555) -0.47 (-12) -2.1%
Width inches (mm) 6.1 (155) 5.71 (145) -0.39 (-10) -6.5%
Circum. inches (mm) 70.13 (1781.28) 68.65 (1743.58) -1.48 (-37.7) -2.1%
Sidewall Height inches (mm) 3.66 (93) 3.43 (87) -0.24 (-6) -6.5%
Revolutions per mile (km) 903.47 (561.39) 923.01 (573.53) 19.53 (12.14) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.58 mph (31.51 km/h)
25 mph (40.23 km/h)24.47 mph (39.38 km/h)
30 mph (48.28 km/h)29.37 mph (47.26 km/h)
35 mph (56.33 km/h)34.26 mph (55.14 km/h)
40 mph (64.37 km/h)39.15 mph (63.01 km/h)
45 mph (72.42 km/h)44.05 mph (70.89 km/h)
50 mph (80.47 km/h)48.94 mph (78.76 km/h)
55 mph (88.51 km/h)53.84 mph (86.64 km/h)
60 mph (96.56 km/h)58.73 mph (94.52 km/h)
65 mph (104.61 km/h)63.62 mph (102.39 km/h)
70 mph (112.65 km/h)68.52 mph (110.27 km/h)
75 mph (120.7 km/h)73.41 mph (118.15 km/h)
80 mph (128.75 km/h)78.31 mph (126.02 km/h)
85 mph (136.79 km/h)83.2 mph (133.9 km/h)
90 mph (144.84 km/h)88.1 mph (141.78 km/h)
95 mph (152.89 km/h)92.99 mph (149.65 km/h)
100 mph (160.93 km/h)97.88 mph (157.53 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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