Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/60r18 vs 285/60r18 Tire Comparison Side By Side
  265/60-18 285/60-18 Difference
Diameter inches (mm) 30.52 (775.2) 31.46 (799.2) 0.94 (24) 3.1%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 95.88 (2435.36) 98.85 (2510.76) 2.97 (75.4) 3.1%
Sidewall Height inches (mm) 6.26 (159) 6.73 (171) 0.47 (12) 7.5%
Revolutions per mile (km) 660.82 (410.62) 640.98 (398.28) -19.84 (-12.33) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.62 mph (33.18 km/h)
25 mph (40.23 km/h)25.77 mph (41.48 km/h)
30 mph (48.28 km/h)30.93 mph (49.78 km/h)
35 mph (56.33 km/h)36.08 mph (58.07 km/h)
40 mph (64.37 km/h)41.24 mph (66.37 km/h)
45 mph (72.42 km/h)46.39 mph (74.66 km/h)
50 mph (80.47 km/h)51.55 mph (82.96 km/h)
55 mph (88.51 km/h)56.7 mph (91.25 km/h)
60 mph (96.56 km/h)61.86 mph (99.55 km/h)
65 mph (104.61 km/h)67.01 mph (107.85 km/h)
70 mph (112.65 km/h)72.17 mph (116.14 km/h)
75 mph (120.7 km/h)77.32 mph (124.44 km/h)
80 mph (128.75 km/h)82.48 mph (132.73 km/h)
85 mph (136.79 km/h)87.63 mph (141.03 km/h)
90 mph (144.84 km/h)92.79 mph (149.33 km/h)
95 mph (152.89 km/h)97.94 mph (157.62 km/h)
100 mph (160.93 km/h)103.1 mph (165.92 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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