Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r16 vs 318/72r17 Tire Comparison Side By Side
  265/65-16 318/72-17 Difference
Diameter inches (mm) 29.56 (750.9) 35.03 (889.72) 5.47 (138.82) 18.5%
Width inches (mm) 10.43 (265) 12.52 (318) 2.09 (53) 20%
Circum. inches (mm) 92.87 (2359.02) 110.04 (2795.14) 17.17 (436.12) 18.5%
Sidewall Height inches (mm) 6.78 (172.25) 9.01 (228.96) 2.23 (56.71) 32.9%
Revolutions per mile (km) 682.21 (423.9) 575.77 (357.76) -106.44 (-66.14) -15.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.7 mph (38.14 km/h)
25 mph (40.23 km/h)29.62 mph (47.67 km/h)
30 mph (48.28 km/h)35.55 mph (57.21 km/h)
35 mph (56.33 km/h)41.47 mph (66.74 km/h)
40 mph (64.37 km/h)47.39 mph (76.27 km/h)
45 mph (72.42 km/h)53.32 mph (85.81 km/h)
50 mph (80.47 km/h)59.24 mph (95.34 km/h)
55 mph (88.51 km/h)65.17 mph (104.88 km/h)
60 mph (96.56 km/h)71.09 mph (114.41 km/h)
65 mph (104.61 km/h)77.02 mph (123.95 km/h)
70 mph (112.65 km/h)82.94 mph (133.48 km/h)
75 mph (120.7 km/h)88.87 mph (143.02 km/h)
80 mph (128.75 km/h)94.79 mph (152.55 km/h)
85 mph (136.79 km/h)100.71 mph (162.08 km/h)
90 mph (144.84 km/h)106.64 mph (171.62 km/h)
95 mph (152.89 km/h)112.56 mph (181.15 km/h)
100 mph (160.93 km/h)118.49 mph (190.69 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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