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 265/60r20 Tire Comparison Side By Side
  265/60-18 265/60-20 Difference
Diameter inches (mm) 30.52 (775.2) 32.52 (826) 2 (50.8) 6.6%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 95.88 (2435.36) 102.16 (2594.96) 6.28 (159.59) 6.6%
Sidewall Height inches (mm) 6.26 (159) 6.26 (159) 0 (0) 0%
Revolutions per mile (km) 660.82 (410.62) 620.18 (385.36) -40.64 (-25.25) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.31 mph (34.3 km/h)
25 mph (40.23 km/h)26.64 mph (42.87 km/h)
30 mph (48.28 km/h)31.97 mph (51.44 km/h)
35 mph (56.33 km/h)37.29 mph (60.02 km/h)
40 mph (64.37 km/h)42.62 mph (68.59 km/h)
45 mph (72.42 km/h)47.95 mph (77.17 km/h)
50 mph (80.47 km/h)53.28 mph (85.74 km/h)
55 mph (88.51 km/h)58.6 mph (94.31 km/h)
60 mph (96.56 km/h)63.93 mph (102.89 km/h)
65 mph (104.61 km/h)69.26 mph (111.46 km/h)
70 mph (112.65 km/h)74.59 mph (120.04 km/h)
75 mph (120.7 km/h)79.91 mph (128.61 km/h)
80 mph (128.75 km/h)85.24 mph (137.18 km/h)
85 mph (136.79 km/h)90.57 mph (145.76 km/h)
90 mph (144.84 km/h)95.9 mph (154.33 km/h)
95 mph (152.89 km/h)101.23 mph (162.91 km/h)
100 mph (160.93 km/h)106.55 mph (171.48 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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