Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/80r16 vs 180/70r16 Tire Comparison Side By Side
  170/80-16 180/70-16 Difference
Diameter inches (mm) 26.71 (678.4) 25.92 (658.4) -0.79 (-20) -2.9%
Width inches (mm) 6.69 (170) 7.09 (180) 0.39 (10) 5.9%
Circum. inches (mm) 83.91 (2131.26) 81.43 (2068.42) -2.47 (-62.83) -2.9%
Sidewall Height inches (mm) 5.35 (136) 4.96 (126) -0.39 (-10) -7.4%
Revolutions per mile (km) 755.12 (469.21) 778.05 (483.46) 22.94 (14.25) 3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.41 mph (31.24 km/h)
25 mph (40.23 km/h)24.26 mph (39.05 km/h)
30 mph (48.28 km/h)29.12 mph (46.86 km/h)
35 mph (56.33 km/h)33.97 mph (54.67 km/h)
40 mph (64.37 km/h)38.82 mph (62.48 km/h)
45 mph (72.42 km/h)43.67 mph (70.29 km/h)
50 mph (80.47 km/h)48.53 mph (78.1 km/h)
55 mph (88.51 km/h)53.38 mph (85.9 km/h)
60 mph (96.56 km/h)58.23 mph (93.71 km/h)
65 mph (104.61 km/h)63.08 mph (101.52 km/h)
70 mph (112.65 km/h)67.94 mph (109.33 km/h)
75 mph (120.7 km/h)72.79 mph (117.14 km/h)
80 mph (128.75 km/h)77.64 mph (124.95 km/h)
85 mph (136.79 km/h)82.49 mph (132.76 km/h)
90 mph (144.84 km/h)87.35 mph (140.57 km/h)
95 mph (152.89 km/h)92.2 mph (148.38 km/h)
100 mph (160.93 km/h)97.05 mph (156.19 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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