Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/82r14 vs 185/65r15 Tire Comparison Side By Side
  185/82-14 185/65-15 Difference
Diameter inches (mm) 25.94 (659) 24.47 (621.5) -1.48 (-37.5) -5.7%
Width inches (mm) 7.28 (185) 7.28 (185) 0 (0) 0%
Circum. inches (mm) 81.51 (2070.31) 76.87 (1952.5) -4.64 (-117.81) -5.7%
Sidewall Height inches (mm) 5.97 (151.7) 4.73 (120.25) -1.24 (-31.45) -20.7%
Revolutions per mile (km) 777.34 (483.02) 824.25 (512.16) 46.9 (29.14) 6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.86 mph (30.36 km/h)
25 mph (40.23 km/h)23.58 mph (37.94 km/h)
30 mph (48.28 km/h)28.29 mph (45.53 km/h)
35 mph (56.33 km/h)33.01 mph (53.12 km/h)
40 mph (64.37 km/h)37.72 mph (60.71 km/h)
45 mph (72.42 km/h)42.44 mph (68.3 km/h)
50 mph (80.47 km/h)47.15 mph (75.89 km/h)
55 mph (88.51 km/h)51.87 mph (83.48 km/h)
60 mph (96.56 km/h)56.59 mph (91.07 km/h)
65 mph (104.61 km/h)61.3 mph (98.65 km/h)
70 mph (112.65 km/h)66.02 mph (106.24 km/h)
75 mph (120.7 km/h)70.73 mph (113.83 km/h)
80 mph (128.75 km/h)75.45 mph (121.42 km/h)
85 mph (136.79 km/h)80.16 mph (129.01 km/h)
90 mph (144.84 km/h)84.88 mph (136.6 km/h)
95 mph (152.89 km/h)89.59 mph (144.19 km/h)
100 mph (160.93 km/h)94.31 mph (151.78 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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