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 275/60r15 Tire Comparison Side By Side
  255/45-15 275/60-15 Difference
Diameter inches (mm) 24.04 (610.5) 27.99 (711) 3.96 (100.5) 16.5%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 75.51 (1917.94) 87.94 (2233.67) 12.43 (315.73) 16.5%
Sidewall Height inches (mm) 4.52 (114.75) 6.5 (165) 1.98 (50.25) 43.8%
Revolutions per mile (km) 839.1 (521.39) 720.49 (447.69) -118.61 (-73.7) -14.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.29 mph (37.49 km/h)
25 mph (40.23 km/h)29.12 mph (46.86 km/h)
30 mph (48.28 km/h)34.94 mph (56.23 km/h)
35 mph (56.33 km/h)40.76 mph (65.6 km/h)
40 mph (64.37 km/h)46.58 mph (74.97 km/h)
45 mph (72.42 km/h)52.41 mph (84.34 km/h)
50 mph (80.47 km/h)58.23 mph (93.71 km/h)
55 mph (88.51 km/h)64.05 mph (103.09 km/h)
60 mph (96.56 km/h)69.88 mph (112.46 km/h)
65 mph (104.61 km/h)75.7 mph (121.83 km/h)
70 mph (112.65 km/h)81.52 mph (131.2 km/h)
75 mph (120.7 km/h)87.35 mph (140.57 km/h)
80 mph (128.75 km/h)93.17 mph (149.94 km/h)
85 mph (136.79 km/h)98.99 mph (159.31 km/h)
90 mph (144.84 km/h)104.82 mph (168.68 km/h)
95 mph (152.89 km/h)110.64 mph (178.06 km/h)
100 mph (160.93 km/h)116.46 mph (187.43 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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