Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/80r14 vs 215/80r14 Tire Comparison Side By Side
  185/80-14 215/80-14 Difference
Diameter inches (mm) 25.65 (651.6) 27.54 (699.6) 1.89 (48) 7.4%
Width inches (mm) 7.28 (185) 8.46 (215) 1.18 (30) 16.2%
Circum. inches (mm) 80.59 (2047.06) 86.53 (2197.86) 5.94 (150.8) 7.4%
Sidewall Height inches (mm) 5.83 (148) 6.77 (172) 0.94 (24) 16.2%
Revolutions per mile (km) 786.17 (488.5) 732.23 (454.99) -53.94 (-33.52) -6.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.47 mph (34.56 km/h)
25 mph (40.23 km/h)26.84 mph (43.2 km/h)
30 mph (48.28 km/h)32.21 mph (51.84 km/h)
35 mph (56.33 km/h)37.58 mph (60.48 km/h)
40 mph (64.37 km/h)42.95 mph (69.12 km/h)
45 mph (72.42 km/h)48.31 mph (77.76 km/h)
50 mph (80.47 km/h)53.68 mph (86.39 km/h)
55 mph (88.51 km/h)59.05 mph (95.03 km/h)
60 mph (96.56 km/h)64.42 mph (103.67 km/h)
65 mph (104.61 km/h)69.79 mph (112.31 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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