Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/45r15 vs 275/55r15 Tire Comparison Side By Side
  255/45-15 275/55-15 Difference
Diameter inches (mm) 24.04 (610.5) 26.91 (683.5) 2.87 (73) 12%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 75.51 (1917.94) 84.54 (2147.28) 9.03 (229.34) 12%
Sidewall Height inches (mm) 4.52 (114.75) 5.95 (151.25) 1.44 (36.5) 31.8%
Revolutions per mile (km) 839.1 (521.39) 749.48 (465.7) -89.62 (-55.69) -10.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.39 mph (36.04 km/h)
25 mph (40.23 km/h)27.99 mph (45.04 km/h)
30 mph (48.28 km/h)33.59 mph (54.05 km/h)
35 mph (56.33 km/h)39.19 mph (63.06 km/h)
40 mph (64.37 km/h)44.78 mph (72.07 km/h)
45 mph (72.42 km/h)50.38 mph (81.08 km/h)
50 mph (80.47 km/h)55.98 mph (90.09 km/h)
55 mph (88.51 km/h)61.58 mph (99.1 km/h)
60 mph (96.56 km/h)67.17 mph (108.11 km/h)
65 mph (104.61 km/h)72.77 mph (117.12 km/h)
70 mph (112.65 km/h)78.37 mph (126.12 km/h)
75 mph (120.7 km/h)83.97 mph (135.13 km/h)
80 mph (128.75 km/h)89.57 mph (144.14 km/h)
85 mph (136.79 km/h)95.16 mph (153.15 km/h)
90 mph (144.84 km/h)100.76 mph (162.16 km/h)
95 mph (152.89 km/h)106.36 mph (171.17 km/h)
100 mph (160.93 km/h)111.96 mph (180.18 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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