Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/75r16.5 vs 33/12.5r15 Tire Comparison Side By Side
  245/75-16.5 33/12.5-15 Difference
Diameter inches (mm) 30.97 (786.6) 33.03 (838.92) 2.06 (52.32) 6.7%
Width inches (mm) 9.65 (245) 12.52 (318) 2.87 (73) 29.8%
Circum. inches (mm) 97.29 (2471.18) 103.76 (2635.54) 6.47 (164.37) 6.7%
Sidewall Height inches (mm) 7.23 (183.75) 9.01 (228.96) 1.78 (45.21) 24.6%
Revolutions per mile (km) 651.25 (404.66) 610.63 (379.43) -40.62 (-25.24) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.33 mph (34.33 km/h)
25 mph (40.23 km/h)26.66 mph (42.91 km/h)
30 mph (48.28 km/h)32 mph (51.49 km/h)
35 mph (56.33 km/h)37.33 mph (60.07 km/h)
40 mph (64.37 km/h)42.66 mph (68.66 km/h)
45 mph (72.42 km/h)47.99 mph (77.24 km/h)
50 mph (80.47 km/h)53.33 mph (85.82 km/h)
55 mph (88.51 km/h)58.66 mph (94.4 km/h)
60 mph (96.56 km/h)63.99 mph (102.98 km/h)
65 mph (104.61 km/h)69.32 mph (111.57 km/h)
70 mph (112.65 km/h)74.66 mph (120.15 km/h)
75 mph (120.7 km/h)79.99 mph (128.73 km/h)
80 mph (128.75 km/h)85.32 mph (137.31 km/h)
85 mph (136.79 km/h)90.65 mph (145.89 km/h)
90 mph (144.84 km/h)95.99 mph (154.48 km/h)
95 mph (152.89 km/h)101.32 mph (163.06 km/h)
100 mph (160.93 km/h)106.65 mph (171.64 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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