Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/90r15 vs 125/35r15 Tire Comparison Side By Side
  125/90-15 125/35-15 Difference
Diameter inches (mm) 23.86 (606) 18.44 (468.5) -5.41 (-137.5) -22.7%
Width inches (mm) 4.92 (125) 4.92 (125) 0 (0) 0%
Circum. inches (mm) 74.95 (1903.81) 57.95 (1471.84) -17.01 (-431.97) -22.7%
Sidewall Height inches (mm) 4.43 (112.5) 1.72 (43.75) -2.71 (-68.75) -61.1%
Revolutions per mile (km) 845.33 (525.26) 1093.43 (679.42) 248.1 (154.16) 29.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)15.46 mph (24.88 km/h)
25 mph (40.23 km/h)19.33 mph (31.1 km/h)
30 mph (48.28 km/h)23.19 mph (37.33 km/h)
35 mph (56.33 km/h)27.06 mph (43.55 km/h)
40 mph (64.37 km/h)30.92 mph (49.77 km/h)
45 mph (72.42 km/h)34.79 mph (55.99 km/h)
50 mph (80.47 km/h)38.66 mph (62.21 km/h)
55 mph (88.51 km/h)42.52 mph (68.43 km/h)
60 mph (96.56 km/h)46.39 mph (74.65 km/h)
65 mph (104.61 km/h)50.25 mph (80.87 km/h)
70 mph (112.65 km/h)54.12 mph (87.09 km/h)
75 mph (120.7 km/h)57.98 mph (93.31 km/h)
80 mph (128.75 km/h)61.85 mph (99.54 km/h)
85 mph (136.79 km/h)65.71 mph (105.76 km/h)
90 mph (144.84 km/h)69.58 mph (111.98 km/h)
95 mph (152.89 km/h)73.44 mph (118.2 km/h)
100 mph (160.93 km/h)77.31 mph (124.42 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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