Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/70r18 vs 130/90r18 Tire Comparison Side By Side
  140/70-18 130/90-18 Difference
Diameter inches (mm) 25.72 (653.2) 27.21 (691.2) 1.5 (38) 5.8%
Width inches (mm) 5.51 (140) 5.12 (130) -0.39 (-10) -7.1%
Circum. inches (mm) 80.79 (2052.09) 85.49 (2171.47) 4.7 (119.38) 5.8%
Sidewall Height inches (mm) 3.86 (98) 4.61 (117) 0.75 (19) 19.4%
Revolutions per mile (km) 784.25 (487.31) 741.13 (460.52) -43.12 (-26.79) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.16 mph (34.06 km/h)
25 mph (40.23 km/h)26.45 mph (42.57 km/h)
30 mph (48.28 km/h)31.75 mph (51.09 km/h)
35 mph (56.33 km/h)37.04 mph (59.6 km/h)
40 mph (64.37 km/h)42.33 mph (68.12 km/h)
45 mph (72.42 km/h)47.62 mph (76.63 km/h)
50 mph (80.47 km/h)52.91 mph (85.15 km/h)
55 mph (88.51 km/h)58.2 mph (93.66 km/h)
60 mph (96.56 km/h)63.49 mph (102.18 km/h)
65 mph (104.61 km/h)68.78 mph (110.69 km/h)
70 mph (112.65 km/h)74.07 mph (119.21 km/h)
75 mph (120.7 km/h)79.36 mph (127.72 km/h)
80 mph (128.75 km/h)84.65 mph (136.24 km/h)
85 mph (136.79 km/h)89.94 mph (144.75 km/h)
90 mph (144.84 km/h)95.24 mph (153.27 km/h)
95 mph (152.89 km/h)100.53 mph (161.78 km/h)
100 mph (160.93 km/h)105.82 mph (170.3 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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