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 215/65r16 Tire Comparison Side By Side
  185/82-14 215/65-16 Difference
Diameter inches (mm) 25.94 (659) 27 (685.9) 1.06 (26.9) 4.1%
Width inches (mm) 7.28 (185) 8.46 (215) 1.18 (30) 16.2%
Circum. inches (mm) 81.51 (2070.31) 84.84 (2154.82) 3.33 (84.51) 4.1%
Sidewall Height inches (mm) 5.97 (151.7) 5.5 (139.75) -0.47 (-11.95) -7.9%
Revolutions per mile (km) 777.34 (483.02) 746.86 (464.08) -30.49 (-18.94) -3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.82 mph (33.5 km/h)
25 mph (40.23 km/h)26.02 mph (41.88 km/h)
30 mph (48.28 km/h)31.22 mph (50.25 km/h)
35 mph (56.33 km/h)36.43 mph (58.63 km/h)
40 mph (64.37 km/h)41.63 mph (67 km/h)
45 mph (72.42 km/h)46.84 mph (75.38 km/h)
50 mph (80.47 km/h)52.04 mph (83.75 km/h)
55 mph (88.51 km/h)57.25 mph (92.13 km/h)
60 mph (96.56 km/h)62.45 mph (100.5 km/h)
65 mph (104.61 km/h)67.65 mph (108.88 km/h)
70 mph (112.65 km/h)72.86 mph (117.25 km/h)
75 mph (120.7 km/h)78.06 mph (125.63 km/h)
80 mph (128.75 km/h)83.27 mph (134 km/h)
85 mph (136.79 km/h)88.47 mph (142.38 km/h)
90 mph (144.84 km/h)93.67 mph (150.75 km/h)
95 mph (152.89 km/h)98.88 mph (159.13 km/h)
100 mph (160.93 km/h)104.08 mph (167.5 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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