Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/60r17 vs 265/65r18 Tire Comparison Side By Side
  265/60-17 265/65-18 Difference
Diameter inches (mm) 29.52 (749.8) 31.56 (801.7) 2.04 (51.9) 6.9%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 92.74 (2355.57) 99.16 (2518.61) 6.42 (163.05) 6.9%
Sidewall Height inches (mm) 6.26 (159) 6.78 (172.25) 0.52 (13.25) 8.3%
Revolutions per mile (km) 683.21 (424.53) 638.98 (397.04) -44.23 (-27.48) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.38 mph (34.41 km/h)
25 mph (40.23 km/h)26.73 mph (43.02 km/h)
30 mph (48.28 km/h)32.08 mph (51.62 km/h)
35 mph (56.33 km/h)37.42 mph (60.23 km/h)
40 mph (64.37 km/h)42.77 mph (68.83 km/h)
45 mph (72.42 km/h)48.11 mph (77.43 km/h)
50 mph (80.47 km/h)53.46 mph (86.04 km/h)
55 mph (88.51 km/h)58.81 mph (94.64 km/h)
60 mph (96.56 km/h)64.15 mph (103.24 km/h)
65 mph (104.61 km/h)69.5 mph (111.85 km/h)
70 mph (112.65 km/h)74.85 mph (120.45 km/h)
75 mph (120.7 km/h)80.19 mph (129.06 km/h)
80 mph (128.75 km/h)85.54 mph (137.66 km/h)
85 mph (136.79 km/h)90.88 mph (146.26 km/h)
90 mph (144.84 km/h)96.23 mph (154.87 km/h)
95 mph (152.89 km/h)101.58 mph (163.47 km/h)
100 mph (160.93 km/h)106.92 mph (172.07 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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