Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r16 vs 125/85r16 Tire Comparison Side By Side
  125/70-16 125/85-16 Difference
Diameter inches (mm) 22.89 (581.4) 24.37 (618.9) 1.48 (37.5) 6.4%
Width inches (mm) 4.92 (125) 4.92 (125) 0 (0) 0%
Circum. inches (mm) 71.91 (1826.52) 76.55 (1944.33) 4.64 (117.81) 6.4%
Sidewall Height inches (mm) 3.44 (87.5) 4.18 (106.25) 0.74 (18.75) 21.4%
Revolutions per mile (km) 881.1 (547.49) 827.71 (514.31) -53.39 (-33.17) -6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.26 km/h)
25 mph (40.23 km/h)26.61 mph (42.83 km/h)
30 mph (48.28 km/h)31.93 mph (51.39 km/h)
35 mph (56.33 km/h)37.26 mph (59.96 km/h)
40 mph (64.37 km/h)42.58 mph (68.53 km/h)
45 mph (72.42 km/h)47.9 mph (77.09 km/h)
50 mph (80.47 km/h)53.22 mph (85.66 km/h)
55 mph (88.51 km/h)58.55 mph (94.22 km/h)
60 mph (96.56 km/h)63.87 mph (102.79 km/h)
65 mph (104.61 km/h)69.19 mph (111.35 km/h)
70 mph (112.65 km/h)74.51 mph (119.92 km/h)
75 mph (120.7 km/h)79.84 mph (128.49 km/h)
80 mph (128.75 km/h)85.16 mph (137.05 km/h)
85 mph (136.79 km/h)90.48 mph (145.62 km/h)
90 mph (144.84 km/h)95.8 mph (154.18 km/h)
95 mph (152.89 km/h)101.13 mph (162.75 km/h)
100 mph (160.93 km/h)106.45 mph (171.31 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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