Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
260/65r18 vs 260/60r18 Tire Comparison Side By Side
  260/65-18 260/60-18 Difference
Diameter inches (mm) 31.31 (795.2) 30.28 (769.2) -1.02 (-26) -3.3%
Width inches (mm) 10.24 (260) 10.24 (260) 0 (0) 0%
Circum. inches (mm) 98.35 (2498.19) 95.14 (2416.51) -3.22 (-81.68) -3.3%
Sidewall Height inches (mm) 6.65 (169) 6.14 (156) -0.51 (-13) -7.7%
Revolutions per mile (km) 644.2 (400.29) 665.98 (413.82) 21.77 (13.53) 3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.35 mph (31.13 km/h)
25 mph (40.23 km/h)24.18 mph (38.92 km/h)
30 mph (48.28 km/h)29.02 mph (46.7 km/h)
35 mph (56.33 km/h)33.86 mph (54.49 km/h)
40 mph (64.37 km/h)38.69 mph (62.27 km/h)
45 mph (72.42 km/h)43.53 mph (70.05 km/h)
50 mph (80.47 km/h)48.37 mph (77.84 km/h)
55 mph (88.51 km/h)53.2 mph (85.62 km/h)
60 mph (96.56 km/h)58.04 mph (93.4 km/h)
65 mph (104.61 km/h)62.87 mph (101.19 km/h)
70 mph (112.65 km/h)67.71 mph (108.97 km/h)
75 mph (120.7 km/h)72.55 mph (116.75 km/h)
80 mph (128.75 km/h)77.38 mph (124.54 km/h)
85 mph (136.79 km/h)82.22 mph (132.32 km/h)
90 mph (144.84 km/h)87.06 mph (140.11 km/h)
95 mph (152.89 km/h)91.89 mph (147.89 km/h)
100 mph (160.93 km/h)96.73 mph (155.67 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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