Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/70r16 vs 185/70r16 Tire Comparison Side By Side
  170/70-16 185/70-16 Difference
Diameter inches (mm) 25.37 (644.4) 26.2 (665.4) 0.83 (21) 3.3%
Width inches (mm) 6.69 (170) 7.28 (185) 0.59 (15) 8.8%
Circum. inches (mm) 79.7 (2024.44) 82.3 (2090.42) 2.6 (65.97) 3.3%
Sidewall Height inches (mm) 4.69 (119) 5.1 (129.5) 0.41 (10.5) 8.8%
Revolutions per mile (km) 794.96 (493.96) 769.87 (478.37) -25.09 (-15.59) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.65 mph (33.24 km/h)
25 mph (40.23 km/h)25.81 mph (41.54 km/h)
30 mph (48.28 km/h)30.98 mph (49.85 km/h)
35 mph (56.33 km/h)36.14 mph (58.16 km/h)
40 mph (64.37 km/h)41.3 mph (66.47 km/h)
45 mph (72.42 km/h)46.47 mph (74.78 km/h)
50 mph (80.47 km/h)51.63 mph (83.09 km/h)
55 mph (88.51 km/h)56.79 mph (91.4 km/h)
60 mph (96.56 km/h)61.96 mph (99.71 km/h)
65 mph (104.61 km/h)67.12 mph (108.02 km/h)
70 mph (112.65 km/h)72.28 mph (116.33 km/h)
75 mph (120.7 km/h)77.44 mph (124.63 km/h)
80 mph (128.75 km/h)82.61 mph (132.94 km/h)
85 mph (136.79 km/h)87.77 mph (141.25 km/h)
90 mph (144.84 km/h)92.93 mph (149.56 km/h)
95 mph (152.89 km/h)98.1 mph (157.87 km/h)
100 mph (160.93 km/h)103.26 mph (166.18 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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