Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
250/70r15 vs 235/70r15 Tire Comparison Side By Side
  250/70-15 235/70-15 Difference
Diameter inches (mm) 28.78 (731) 27.95 (710) -0.83 (-21) -2.9%
Width inches (mm) 9.84 (250) 9.25 (235) -0.59 (-15) -6%
Circum. inches (mm) 90.41 (2296.5) 87.82 (2230.53) -2.6 (-65.97) -2.9%
Sidewall Height inches (mm) 6.89 (175) 6.48 (164.5) -0.41 (-10.5) -6%
Revolutions per mile (km) 700.78 (435.44) 721.51 (448.32) 20.73 (12.88) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.43 mph (31.26 km/h)
25 mph (40.23 km/h)24.28 mph (39.08 km/h)
30 mph (48.28 km/h)29.14 mph (46.89 km/h)
35 mph (56.33 km/h)33.99 mph (54.71 km/h)
40 mph (64.37 km/h)38.85 mph (62.52 km/h)
45 mph (72.42 km/h)43.71 mph (70.34 km/h)
50 mph (80.47 km/h)48.56 mph (78.16 km/h)
55 mph (88.51 km/h)53.42 mph (85.97 km/h)
60 mph (96.56 km/h)58.28 mph (93.79 km/h)
65 mph (104.61 km/h)63.13 mph (101.6 km/h)
70 mph (112.65 km/h)67.99 mph (109.42 km/h)
75 mph (120.7 km/h)72.85 mph (117.23 km/h)
80 mph (128.75 km/h)77.7 mph (125.05 km/h)
85 mph (136.79 km/h)82.56 mph (132.86 km/h)
90 mph (144.84 km/h)87.41 mph (140.68 km/h)
95 mph (152.89 km/h)92.27 mph (148.5 km/h)
100 mph (160.93 km/h)97.13 mph (156.31 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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