Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/85r16 vs 265/75r16 Tire Comparison Side By Side
  255/85-16 265/75-16 Difference
Diameter inches (mm) 33.07 (839.9) 31.65 (803.9) -1.42 (-36) -4.3%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 103.88 (2638.62) 99.43 (2525.53) -4.45 (-113.1) -4.3%
Sidewall Height inches (mm) 8.53 (216.75) 7.82 (198.75) -0.71 (-18) -8.3%
Revolutions per mile (km) 609.92 (378.98) 637.23 (395.96) 27.31 (16.97) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.14 mph (30.81 km/h)
25 mph (40.23 km/h)23.93 mph (38.51 km/h)
30 mph (48.28 km/h)28.71 mph (46.21 km/h)
35 mph (56.33 km/h)33.5 mph (53.91 km/h)
40 mph (64.37 km/h)38.29 mph (61.61 km/h)
45 mph (72.42 km/h)43.07 mph (69.32 km/h)
50 mph (80.47 km/h)47.86 mph (77.02 km/h)
55 mph (88.51 km/h)52.64 mph (84.72 km/h)
60 mph (96.56 km/h)57.43 mph (92.42 km/h)
65 mph (104.61 km/h)62.21 mph (100.12 km/h)
70 mph (112.65 km/h)67 mph (107.83 km/h)
75 mph (120.7 km/h)71.79 mph (115.53 km/h)
80 mph (128.75 km/h)76.57 mph (123.23 km/h)
85 mph (136.79 km/h)81.36 mph (130.93 km/h)
90 mph (144.84 km/h)86.14 mph (138.63 km/h)
95 mph (152.89 km/h)90.93 mph (146.33 km/h)
100 mph (160.93 km/h)95.71 mph (154.04 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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