Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
180/70r16 vs 185/70r16 Tire Comparison Side By Side
  180/70-16 185/70-16 Difference
Diameter inches (mm) 25.92 (658.4) 26.2 (665.4) 0.28 (7) 1.1%
Width inches (mm) 7.09 (180) 7.28 (185) 0.2 (5) 2.8%
Circum. inches (mm) 81.43 (2068.42) 82.3 (2090.42) 0.87 (21.99) 1.1%
Sidewall Height inches (mm) 4.96 (126) 5.1 (129.5) 0.14 (3.5) 2.8%
Revolutions per mile (km) 778.05 (483.46) 769.87 (478.37) -8.19 (-5.09) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.21 mph (32.53 km/h)
25 mph (40.23 km/h)25.27 mph (40.66 km/h)
30 mph (48.28 km/h)30.32 mph (48.79 km/h)
35 mph (56.33 km/h)35.37 mph (56.93 km/h)
40 mph (64.37 km/h)40.43 mph (65.06 km/h)
45 mph (72.42 km/h)45.48 mph (73.19 km/h)
50 mph (80.47 km/h)50.53 mph (81.32 km/h)
55 mph (88.51 km/h)55.58 mph (89.46 km/h)
60 mph (96.56 km/h)60.64 mph (97.59 km/h)
65 mph (104.61 km/h)65.69 mph (105.72 km/h)
70 mph (112.65 km/h)70.74 mph (113.85 km/h)
75 mph (120.7 km/h)75.8 mph (121.98 km/h)
80 mph (128.75 km/h)80.85 mph (130.12 km/h)
85 mph (136.79 km/h)85.9 mph (138.25 km/h)
90 mph (144.84 km/h)90.96 mph (146.38 km/h)
95 mph (152.89 km/h)96.01 mph (154.51 km/h)
100 mph (160.93 km/h)101.06 mph (162.65 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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