Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r16 vs 125/85r16 Tire Comparison Side By Side
  135/90-16 125/85-16 Difference
Diameter inches (mm) 25.57 (649.4) 24.37 (618.9) -1.2 (-30.5) -4.7%
Width inches (mm) 5.31 (135) 4.92 (125) -0.39 (-10) -7.4%
Circum. inches (mm) 80.32 (2040.15) 76.55 (1944.33) -3.77 (-95.82) -4.7%
Sidewall Height inches (mm) 4.78 (121.5) 4.18 (106.25) -0.6 (-15.25) -12.6%
Revolutions per mile (km) 788.84 (490.16) 827.71 (514.31) 38.87 (24.16) 4.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.06 mph (30.68 km/h)
25 mph (40.23 km/h)23.83 mph (38.34 km/h)
30 mph (48.28 km/h)28.59 mph (46.01 km/h)
35 mph (56.33 km/h)33.36 mph (53.68 km/h)
40 mph (64.37 km/h)38.12 mph (61.35 km/h)
45 mph (72.42 km/h)42.89 mph (69.02 km/h)
50 mph (80.47 km/h)47.65 mph (76.69 km/h)
55 mph (88.51 km/h)52.42 mph (84.36 km/h)
60 mph (96.56 km/h)57.18 mph (92.03 km/h)
65 mph (104.61 km/h)61.95 mph (99.69 km/h)
70 mph (112.65 km/h)66.71 mph (107.36 km/h)
75 mph (120.7 km/h)71.48 mph (115.03 km/h)
80 mph (128.75 km/h)76.24 mph (122.7 km/h)
85 mph (136.79 km/h)81.01 mph (130.37 km/h)
90 mph (144.84 km/h)85.77 mph (138.04 km/h)
95 mph (152.89 km/h)90.54 mph (145.71 km/h)
100 mph (160.93 km/h)95.3 mph (153.38 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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