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 125/90r16 Tire Comparison Side By Side
  125/80-16 125/90-16 Difference
Diameter inches (mm) 23.87 (606.4) 24.86 (631.4) 0.98 (25) 4.1%
Width inches (mm) 4.92 (125) 4.92 (125) 0 (0) 0%
Circum. inches (mm) 75 (1905.06) 78.09 (1983.6) 3.09 (78.54) 4.1%
Sidewall Height inches (mm) 3.94 (100) 4.43 (112.5) 0.49 (12.5) 12.5%
Revolutions per mile (km) 844.77 (524.92) 811.32 (504.13) -33.45 (-20.78) -4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.82 mph (33.51 km/h)
25 mph (40.23 km/h)26.03 mph (41.89 km/h)
30 mph (48.28 km/h)31.24 mph (50.27 km/h)
35 mph (56.33 km/h)36.44 mph (58.65 km/h)
40 mph (64.37 km/h)41.65 mph (67.03 km/h)
45 mph (72.42 km/h)46.86 mph (75.41 km/h)
50 mph (80.47 km/h)52.06 mph (83.78 km/h)
55 mph (88.51 km/h)57.27 mph (92.16 km/h)
60 mph (96.56 km/h)62.47 mph (100.54 km/h)
65 mph (104.61 km/h)67.68 mph (108.92 km/h)
70 mph (112.65 km/h)72.89 mph (117.3 km/h)
75 mph (120.7 km/h)78.09 mph (125.68 km/h)
80 mph (128.75 km/h)83.3 mph (134.06 km/h)
85 mph (136.79 km/h)88.5 mph (142.43 km/h)
90 mph (144.84 km/h)93.71 mph (150.81 km/h)
95 mph (152.89 km/h)98.92 mph (159.19 km/h)
100 mph (160.93 km/h)104.12 mph (167.57 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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