Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/80r17 vs 35/12.5r17 Tire Comparison Side By Side
  245/80-17 35/12.5-17 Difference
Diameter inches (mm) 32.43 (823.8) 35.03 (889.72) 2.6 (65.92) 8%
Width inches (mm) 9.65 (245) 12.52 (318) 2.87 (73) 29.8%
Circum. inches (mm) 101.89 (2588.04) 110.04 (2795.14) 8.15 (207.09) 8%
Sidewall Height inches (mm) 7.72 (196) 9.01 (228.96) 1.3 (32.96) 16.8%
Revolutions per mile (km) 621.84 (386.39) 575.77 (357.76) -46.07 (-28.63) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.6 mph (34.76 km/h)
25 mph (40.23 km/h)27 mph (43.45 km/h)
30 mph (48.28 km/h)32.4 mph (52.14 km/h)
35 mph (56.33 km/h)37.8 mph (60.83 km/h)
40 mph (64.37 km/h)43.2 mph (69.53 km/h)
45 mph (72.42 km/h)48.6 mph (78.22 km/h)
50 mph (80.47 km/h)54 mph (86.91 km/h)
55 mph (88.51 km/h)59.4 mph (95.6 km/h)
60 mph (96.56 km/h)64.8 mph (104.29 km/h)
65 mph (104.61 km/h)70.2 mph (112.98 km/h)
70 mph (112.65 km/h)75.6 mph (121.67 km/h)
75 mph (120.7 km/h)81 mph (130.36 km/h)
80 mph (128.75 km/h)86.4 mph (139.05 km/h)
85 mph (136.79 km/h)91.8 mph (147.74 km/h)
90 mph (144.84 km/h)97.2 mph (156.43 km/h)
95 mph (152.89 km/h)102.6 mph (165.12 km/h)
100 mph (160.93 km/h)108 mph (173.81 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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