Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r15 vs 265/70r16 Tire Comparison Side By Side
  205/70-15 265/70-16 Difference
Diameter inches (mm) 26.3 (668) 30.61 (777.4) 4.31 (109.4) 16.4%
Width inches (mm) 8.07 (205) 10.43 (265) 2.36 (60) 29.3%
Circum. inches (mm) 82.62 (2098.58) 96.15 (2442.27) 13.53 (343.69) 16.4%
Sidewall Height inches (mm) 5.65 (143.5) 7.3 (185.5) 1.65 (42) 29.3%
Revolutions per mile (km) 766.87 (476.51) 658.95 (409.45) -107.92 (-67.06) -14.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.28 mph (37.46 km/h)
25 mph (40.23 km/h)29.09 mph (46.82 km/h)
30 mph (48.28 km/h)34.91 mph (56.19 km/h)
35 mph (56.33 km/h)40.73 mph (65.55 km/h)
40 mph (64.37 km/h)46.55 mph (74.92 km/h)
45 mph (72.42 km/h)52.37 mph (84.28 km/h)
50 mph (80.47 km/h)58.19 mph (93.65 km/h)
55 mph (88.51 km/h)64.01 mph (103.01 km/h)
60 mph (96.56 km/h)69.83 mph (112.37 km/h)
65 mph (104.61 km/h)75.65 mph (121.74 km/h)
70 mph (112.65 km/h)81.46 mph (131.1 km/h)
75 mph (120.7 km/h)87.28 mph (140.47 km/h)
80 mph (128.75 km/h)93.1 mph (149.83 km/h)
85 mph (136.79 km/h)98.92 mph (159.2 km/h)
90 mph (144.84 km/h)104.74 mph (168.56 km/h)
95 mph (152.89 km/h)110.56 mph (177.93 km/h)
100 mph (160.93 km/h)116.38 mph (187.29 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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