Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/45r18 vs 255/45r18 Tire Comparison Side By Side
  275/45-18 255/45-18 Difference
Diameter inches (mm) 27.74 (704.7) 27.04 (686.7) -0.71 (-18) -2.6%
Width inches (mm) 10.83 (275) 10.04 (255) -0.79 (-20) -7.3%
Circum. inches (mm) 87.16 (2213.88) 84.93 (2157.33) -2.23 (-56.55) -2.6%
Sidewall Height inches (mm) 4.87 (123.75) 4.52 (114.75) -0.35 (-9) -7.3%
Revolutions per mile (km) 726.93 (451.69) 745.99 (463.53) 19.05 (11.84) 2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.49 mph (31.36 km/h)
25 mph (40.23 km/h)24.36 mph (39.21 km/h)
30 mph (48.28 km/h)29.23 mph (47.05 km/h)
35 mph (56.33 km/h)34.11 mph (54.89 km/h)
40 mph (64.37 km/h)38.98 mph (62.73 km/h)
45 mph (72.42 km/h)43.85 mph (70.57 km/h)
50 mph (80.47 km/h)48.72 mph (78.41 km/h)
55 mph (88.51 km/h)53.6 mph (86.25 km/h)
60 mph (96.56 km/h)58.47 mph (94.09 km/h)
65 mph (104.61 km/h)63.34 mph (101.94 km/h)
70 mph (112.65 km/h)68.21 mph (109.78 km/h)
75 mph (120.7 km/h)73.08 mph (117.62 km/h)
80 mph (128.75 km/h)77.96 mph (125.46 km/h)
85 mph (136.79 km/h)82.83 mph (133.3 km/h)
90 mph (144.84 km/h)87.7 mph (141.14 km/h)
95 mph (152.89 km/h)92.57 mph (148.98 km/h)
100 mph (160.93 km/h)97.45 mph (156.82 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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