Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
36/12.5r16.5 vs 375/50r17 Tire Comparison Side By Side
  36/12.5-16.5 375/50-17 Difference
Diameter inches (mm) 36.03 (915.18) 31.76 (806.8) -4.27 (-108.38) -11.8%
Width inches (mm) 12.52 (318) 14.76 (375) 2.24 (57) 17.9%
Circum. inches (mm) 113.19 (2875.12) 99.79 (2534.64) -13.4 (-340.49) -11.8%
Sidewall Height inches (mm) 9.77 (248.04) 7.38 (187.5) -2.38 (-60.54) -24.4%
Revolutions per mile (km) 559.75 (347.81) 634.94 (394.53) 75.19 (46.72) 13.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.63 mph (28.38 km/h)
25 mph (40.23 km/h)22.04 mph (35.47 km/h)
30 mph (48.28 km/h)26.45 mph (42.56 km/h)
35 mph (56.33 km/h)30.86 mph (49.66 km/h)
40 mph (64.37 km/h)35.26 mph (56.75 km/h)
45 mph (72.42 km/h)39.67 mph (63.84 km/h)
50 mph (80.47 km/h)44.08 mph (70.94 km/h)
55 mph (88.51 km/h)48.49 mph (78.03 km/h)
60 mph (96.56 km/h)52.89 mph (85.13 km/h)
65 mph (104.61 km/h)57.3 mph (92.22 km/h)
70 mph (112.65 km/h)61.71 mph (99.31 km/h)
75 mph (120.7 km/h)66.12 mph (106.41 km/h)
80 mph (128.75 km/h)70.53 mph (113.5 km/h)
85 mph (136.79 km/h)74.93 mph (120.59 km/h)
90 mph (144.84 km/h)79.34 mph (127.69 km/h)
95 mph (152.89 km/h)83.75 mph (134.78 km/h)
100 mph (160.93 km/h)88.16 mph (141.88 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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