Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/25r20 vs 265/60r17 Tire Comparison Side By Side
  275/25-20 265/60-17 Difference
Diameter inches (mm) 25.41 (645.5) 29.52 (749.8) 4.11 (104.3) 16.2%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 79.84 (2027.9) 92.74 (2355.57) 12.9 (327.67) 16.2%
Sidewall Height inches (mm) 2.71 (68.75) 6.26 (159) 3.55 (90.25) 131.3%
Revolutions per mile (km) 793.6 (493.12) 683.21 (424.53) -110.39 (-68.59) -13.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.23 mph (37.39 km/h)
25 mph (40.23 km/h)29.04 mph (46.73 km/h)
30 mph (48.28 km/h)34.85 mph (56.08 km/h)
35 mph (56.33 km/h)40.66 mph (65.43 km/h)
40 mph (64.37 km/h)46.46 mph (74.78 km/h)
45 mph (72.42 km/h)52.27 mph (84.12 km/h)
50 mph (80.47 km/h)58.08 mph (93.47 km/h)
55 mph (88.51 km/h)63.89 mph (102.82 km/h)
60 mph (96.56 km/h)69.69 mph (112.16 km/h)
65 mph (104.61 km/h)75.5 mph (121.51 km/h)
70 mph (112.65 km/h)81.31 mph (130.86 km/h)
75 mph (120.7 km/h)87.12 mph (140.2 km/h)
80 mph (128.75 km/h)92.93 mph (149.55 km/h)
85 mph (136.79 km/h)98.73 mph (158.9 km/h)
90 mph (144.84 km/h)104.54 mph (168.24 km/h)
95 mph (152.89 km/h)110.35 mph (177.59 km/h)
100 mph (160.93 km/h)116.16 mph (186.94 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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