Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/70r16 vs 265/75r16 Tire Comparison Side By Side
  325/70-16 265/75-16 Difference
Diameter inches (mm) 33.91 (861.4) 31.65 (803.9) -2.26 (-57.5) -6.7%
Width inches (mm) 12.8 (325) 10.43 (265) -2.36 (-60) -18.5%
Circum. inches (mm) 106.54 (2706.17) 99.43 (2525.53) -7.11 (-180.64) -6.7%
Sidewall Height inches (mm) 8.96 (227.5) 7.82 (198.75) -1.13 (-28.75) -12.6%
Revolutions per mile (km) 594.69 (369.53) 637.23 (395.96) 42.54 (26.43) 7.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.66 mph (30.04 km/h)
25 mph (40.23 km/h)23.33 mph (37.55 km/h)
30 mph (48.28 km/h)28 mph (45.06 km/h)
35 mph (56.33 km/h)32.66 mph (52.57 km/h)
40 mph (64.37 km/h)37.33 mph (60.08 km/h)
45 mph (72.42 km/h)42 mph (67.59 km/h)
50 mph (80.47 km/h)46.66 mph (75.1 km/h)
55 mph (88.51 km/h)51.33 mph (82.61 km/h)
60 mph (96.56 km/h)55.99 mph (90.12 km/h)
65 mph (104.61 km/h)60.66 mph (97.62 km/h)
70 mph (112.65 km/h)65.33 mph (105.13 km/h)
75 mph (120.7 km/h)69.99 mph (112.64 km/h)
80 mph (128.75 km/h)74.66 mph (120.15 km/h)
85 mph (136.79 km/h)79.33 mph (127.66 km/h)
90 mph (144.84 km/h)83.99 mph (135.17 km/h)
95 mph (152.89 km/h)88.66 mph (142.68 km/h)
100 mph (160.93 km/h)93.32 mph (150.19 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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