Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/75r15 vs 33/10.5r15 Tire Comparison Side By Side
  275/75-15 33/10.5-15 Difference
Diameter inches (mm) 31.24 (793.5) 33.08 (840.24) 1.84 (46.74) 5.9%
Width inches (mm) 10.83 (275) 10.51 (267) -0.31 (-8) -2.9%
Circum. inches (mm) 98.14 (2492.85) 103.92 (2639.69) 5.78 (146.84) 5.9%
Sidewall Height inches (mm) 8.12 (206.25) 9.04 (229.62) 0.92 (23.37) 11.3%
Revolutions per mile (km) 645.58 (401.15) 609.67 (378.83) -35.91 (-22.31) -5.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.18 mph (34.08 km/h)
25 mph (40.23 km/h)26.47 mph (42.6 km/h)
30 mph (48.28 km/h)31.77 mph (51.12 km/h)
35 mph (56.33 km/h)37.06 mph (59.65 km/h)
40 mph (64.37 km/h)42.36 mph (68.17 km/h)
45 mph (72.42 km/h)47.65 mph (76.69 km/h)
50 mph (80.47 km/h)52.95 mph (85.21 km/h)
55 mph (88.51 km/h)58.24 mph (93.73 km/h)
60 mph (96.56 km/h)63.53 mph (102.25 km/h)
65 mph (104.61 km/h)68.83 mph (110.77 km/h)
70 mph (112.65 km/h)74.12 mph (119.29 km/h)
75 mph (120.7 km/h)79.42 mph (127.81 km/h)
80 mph (128.75 km/h)84.71 mph (136.33 km/h)
85 mph (136.79 km/h)90.01 mph (144.85 km/h)
90 mph (144.84 km/h)95.3 mph (153.37 km/h)
95 mph (152.89 km/h)100.6 mph (161.89 km/h)
100 mph (160.93 km/h)105.89 mph (170.41 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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