Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r16 vs 235/70r16 Tire Comparison Side By Side
  255/65-16 235/70-16 Difference
Diameter inches (mm) 29.05 (737.9) 28.95 (735.4) -0.1 (-2.5) -0.3%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 91.27 (2318.18) 90.96 (2310.33) -0.31 (-7.85) -0.3%
Sidewall Height inches (mm) 6.53 (165.75) 6.48 (164.5) -0.05 (-1.25) -0.8%
Revolutions per mile (km) 694.23 (431.37) 696.59 (432.84) 2.36 (1.47) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.93 mph (32.08 km/h)
25 mph (40.23 km/h)24.92 mph (40.1 km/h)
30 mph (48.28 km/h)29.9 mph (48.12 km/h)
35 mph (56.33 km/h)34.88 mph (56.14 km/h)
40 mph (64.37 km/h)39.86 mph (64.16 km/h)
45 mph (72.42 km/h)44.85 mph (72.18 km/h)
50 mph (80.47 km/h)49.83 mph (80.19 km/h)
55 mph (88.51 km/h)54.81 mph (88.21 km/h)
60 mph (96.56 km/h)59.8 mph (96.23 km/h)
65 mph (104.61 km/h)64.78 mph (104.25 km/h)
70 mph (112.65 km/h)69.76 mph (112.27 km/h)
75 mph (120.7 km/h)74.75 mph (120.29 km/h)
80 mph (128.75 km/h)79.73 mph (128.31 km/h)
85 mph (136.79 km/h)84.71 mph (136.33 km/h)
90 mph (144.84 km/h)89.7 mph (144.35 km/h)
95 mph (152.89 km/h)94.68 mph (152.37 km/h)
100 mph (160.93 km/h)99.66 mph (160.39 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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