Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/75r16 vs 315/70r17 Tire Comparison Side By Side
  265/75-16 315/70-17 Difference
Diameter inches (mm) 31.65 (803.9) 34.36 (872.8) 2.71 (68.9) 8.6%
Width inches (mm) 10.43 (265) 12.4 (315) 1.97 (50) 18.9%
Circum. inches (mm) 99.43 (2525.53) 107.95 (2741.98) 8.52 (216.46) 8.6%
Sidewall Height inches (mm) 7.82 (198.75) 8.68 (220.5) 0.86 (21.75) 10.9%
Revolutions per mile (km) 637.23 (395.96) 586.93 (364.7) -50.3 (-31.26) -7.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.71 mph (34.95 km/h)
25 mph (40.23 km/h)27.14 mph (43.68 km/h)
30 mph (48.28 km/h)32.57 mph (52.42 km/h)
35 mph (56.33 km/h)38 mph (61.15 km/h)
40 mph (64.37 km/h)43.43 mph (69.89 km/h)
45 mph (72.42 km/h)48.86 mph (78.63 km/h)
50 mph (80.47 km/h)54.29 mph (87.36 km/h)
55 mph (88.51 km/h)59.71 mph (96.1 km/h)
60 mph (96.56 km/h)65.14 mph (104.84 km/h)
65 mph (104.61 km/h)70.57 mph (113.57 km/h)
70 mph (112.65 km/h)76 mph (122.31 km/h)
75 mph (120.7 km/h)81.43 mph (131.05 km/h)
80 mph (128.75 km/h)86.86 mph (139.78 km/h)
85 mph (136.79 km/h)92.29 mph (148.52 km/h)
90 mph (144.84 km/h)97.71 mph (157.26 km/h)
95 mph (152.89 km/h)103.14 mph (165.99 km/h)
100 mph (160.93 km/h)108.57 mph (174.73 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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