Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/80r16 vs 125/85r16 Tire Comparison Side By Side
  125/80-16 125/85-16 Difference
Diameter inches (mm) 23.87 (606.4) 24.37 (618.9) 0.49 (12.5) 2.1%
Width inches (mm) 4.92 (125) 4.92 (125) 0 (0) 0%
Circum. inches (mm) 75 (1905.06) 76.55 (1944.33) 1.55 (39.27) 2.1%
Sidewall Height inches (mm) 3.94 (100) 4.18 (106.25) 0.25 (6.25) 6.3%
Revolutions per mile (km) 844.77 (524.92) 827.71 (514.31) -17.06 (-10.6) -2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.41 mph (32.85 km/h)
25 mph (40.23 km/h)25.52 mph (41.06 km/h)
30 mph (48.28 km/h)30.62 mph (49.28 km/h)
35 mph (56.33 km/h)35.72 mph (57.49 km/h)
40 mph (64.37 km/h)40.82 mph (65.7 km/h)
45 mph (72.42 km/h)45.93 mph (73.91 km/h)
50 mph (80.47 km/h)51.03 mph (82.13 km/h)
55 mph (88.51 km/h)56.13 mph (90.34 km/h)
60 mph (96.56 km/h)61.24 mph (98.55 km/h)
65 mph (104.61 km/h)66.34 mph (106.76 km/h)
70 mph (112.65 km/h)71.44 mph (114.98 km/h)
75 mph (120.7 km/h)76.55 mph (123.19 km/h)
80 mph (128.75 km/h)81.65 mph (131.4 km/h)
85 mph (136.79 km/h)86.75 mph (139.61 km/h)
90 mph (144.84 km/h)91.86 mph (147.83 km/h)
95 mph (152.89 km/h)96.96 mph (156.04 km/h)
100 mph (160.93 km/h)102.06 mph (164.25 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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