Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/85r15 vs 265/75r15 Tire Comparison Side By Side
  235/85-15 265/75-15 Difference
Diameter inches (mm) 30.73 (780.5) 30.65 (778.5) -0.08 (-2) -0.3%
Width inches (mm) 9.25 (235) 10.43 (265) 1.18 (30) 12.8%
Circum. inches (mm) 96.54 (2452.01) 96.29 (2445.73) -0.25 (-6.28) -0.3%
Sidewall Height inches (mm) 7.86 (199.75) 7.82 (198.75) -0.04 (-1) -0.5%
Revolutions per mile (km) 656.34 (407.83) 658.02 (408.88) 1.69 (1.05) 0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.95 mph (32.1 km/h)
25 mph (40.23 km/h)24.94 mph (40.13 km/h)
30 mph (48.28 km/h)29.92 mph (48.16 km/h)
35 mph (56.33 km/h)34.91 mph (56.18 km/h)
40 mph (64.37 km/h)39.9 mph (64.21 km/h)
45 mph (72.42 km/h)44.88 mph (72.24 km/h)
50 mph (80.47 km/h)49.87 mph (80.26 km/h)
55 mph (88.51 km/h)54.86 mph (88.29 km/h)
60 mph (96.56 km/h)59.85 mph (96.31 km/h)
65 mph (104.61 km/h)64.83 mph (104.34 km/h)
70 mph (112.65 km/h)69.82 mph (112.37 km/h)
75 mph (120.7 km/h)74.81 mph (120.39 km/h)
80 mph (128.75 km/h)79.8 mph (128.42 km/h)
85 mph (136.79 km/h)84.78 mph (136.44 km/h)
90 mph (144.84 km/h)89.77 mph (144.47 km/h)
95 mph (152.89 km/h)94.76 mph (152.5 km/h)
100 mph (160.93 km/h)99.74 mph (160.52 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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