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 275/35r15 Tire Comparison Side By Side
  255/45-15 275/35-15 Difference
Diameter inches (mm) 24.04 (610.5) 22.58 (573.5) -1.46 (-37) -6.1%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 75.51 (1917.94) 70.93 (1801.7) -4.58 (-116.24) -6.1%
Sidewall Height inches (mm) 4.52 (114.75) 3.79 (96.25) -0.73 (-18.5) -16.1%
Revolutions per mile (km) 839.1 (521.39) 893.23 (555.03) 54.14 (33.64) 6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.79 mph (30.24 km/h)
25 mph (40.23 km/h)23.48 mph (37.8 km/h)
30 mph (48.28 km/h)28.18 mph (45.35 km/h)
35 mph (56.33 km/h)32.88 mph (52.91 km/h)
40 mph (64.37 km/h)37.58 mph (60.47 km/h)
45 mph (72.42 km/h)42.27 mph (68.03 km/h)
50 mph (80.47 km/h)46.97 mph (75.59 km/h)
55 mph (88.51 km/h)51.67 mph (83.15 km/h)
60 mph (96.56 km/h)56.36 mph (90.71 km/h)
65 mph (104.61 km/h)61.06 mph (98.27 km/h)
70 mph (112.65 km/h)65.76 mph (105.83 km/h)
75 mph (120.7 km/h)70.45 mph (113.39 km/h)
80 mph (128.75 km/h)75.15 mph (120.94 km/h)
85 mph (136.79 km/h)79.85 mph (128.5 km/h)
90 mph (144.84 km/h)84.55 mph (136.06 km/h)
95 mph (152.89 km/h)89.24 mph (143.62 km/h)
100 mph (160.93 km/h)93.94 mph (151.18 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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