Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
140/85r16 vs 150/80r16 Tire Comparison Side By Side
  140/85-16 150/80-16 Difference
Diameter inches (mm) 25.37 (644.4) 25.45 (646.4) 0.08 (2) 0.3%
Width inches (mm) 5.51 (140) 5.91 (150) 0.39 (10) 7.1%
Circum. inches (mm) 79.7 (2024.44) 79.95 (2030.73) 0.25 (6.28) 0.3%
Sidewall Height inches (mm) 4.69 (119) 4.72 (120) 0.04 (1) 0.8%
Revolutions per mile (km) 794.96 (493.96) 792.5 (492.43) -2.46 (-1.53) -0.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.06 mph (32.29 km/h)
25 mph (40.23 km/h)25.08 mph (40.36 km/h)
30 mph (48.28 km/h)30.09 mph (48.43 km/h)
35 mph (56.33 km/h)35.11 mph (56.5 km/h)
40 mph (64.37 km/h)40.12 mph (64.57 km/h)
45 mph (72.42 km/h)45.14 mph (72.65 km/h)
50 mph (80.47 km/h)50.16 mph (80.72 km/h)
55 mph (88.51 km/h)55.17 mph (88.79 km/h)
60 mph (96.56 km/h)60.19 mph (96.86 km/h)
65 mph (104.61 km/h)65.2 mph (104.93 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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