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 35/12.5r15 Tire Comparison Side By Side
  245/75-16.5 35/12.5-15 Difference
Diameter inches (mm) 30.97 (786.6) 35.03 (889.8) 4.06 (103.2) 13.1%
Width inches (mm) 9.65 (245) 12.52 (318) 2.87 (73) 29.8%
Circum. inches (mm) 97.29 (2471.18) 110.05 (2795.39) 12.76 (324.21) 13.1%
Sidewall Height inches (mm) 7.23 (183.75) 10.02 (254.4) 2.78 (70.65) 38.4%
Revolutions per mile (km) 651.25 (404.66) 575.71 (357.73) -75.53 (-46.93) -11.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.62 mph (36.41 km/h)
25 mph (40.23 km/h)28.28 mph (45.51 km/h)
30 mph (48.28 km/h)33.94 mph (54.61 km/h)
35 mph (56.33 km/h)39.59 mph (63.72 km/h)
40 mph (64.37 km/h)45.25 mph (72.82 km/h)
45 mph (72.42 km/h)50.9 mph (81.92 km/h)
50 mph (80.47 km/h)56.56 mph (91.02 km/h)
55 mph (88.51 km/h)62.22 mph (100.13 km/h)
60 mph (96.56 km/h)67.87 mph (109.23 km/h)
65 mph (104.61 km/h)73.53 mph (118.33 km/h)
70 mph (112.65 km/h)79.18 mph (127.43 km/h)
75 mph (120.7 km/h)84.84 mph (136.54 km/h)
80 mph (128.75 km/h)90.5 mph (145.64 km/h)
85 mph (136.79 km/h)96.15 mph (154.74 km/h)
90 mph (144.84 km/h)101.81 mph (163.84 km/h)
95 mph (152.89 km/h)107.46 mph (172.95 km/h)
100 mph (160.93 km/h)113.12 mph (182.05 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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