Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/65r15 vs 135/60r15 Tire Comparison Side By Side
  155/65-15 135/60-15 Difference
Diameter inches (mm) 22.93 (582.5) 21.38 (543) -1.56 (-39.5) -6.8%
Width inches (mm) 6.1 (155) 5.31 (135) -0.79 (-20) -12.9%
Circum. inches (mm) 72.05 (1829.98) 67.16 (1705.88) -4.89 (-124.09) -6.8%
Sidewall Height inches (mm) 3.97 (100.75) 3.19 (81) -0.78 (-19.75) -19.6%
Revolutions per mile (km) 879.43 (546.45) 943.41 (586.2) 63.97 (39.75) 7.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.64 mph (30 km/h)
25 mph (40.23 km/h)23.3 mph (37.51 km/h)
30 mph (48.28 km/h)27.97 mph (45.01 km/h)
35 mph (56.33 km/h)32.63 mph (52.51 km/h)
40 mph (64.37 km/h)37.29 mph (60.01 km/h)
45 mph (72.42 km/h)41.95 mph (67.51 km/h)
50 mph (80.47 km/h)46.61 mph (75.01 km/h)
55 mph (88.51 km/h)51.27 mph (82.51 km/h)
60 mph (96.56 km/h)55.93 mph (90.01 km/h)
65 mph (104.61 km/h)60.59 mph (97.51 km/h)
70 mph (112.65 km/h)65.25 mph (105.02 km/h)
75 mph (120.7 km/h)69.91 mph (112.52 km/h)
80 mph (128.75 km/h)74.58 mph (120.02 km/h)
85 mph (136.79 km/h)79.24 mph (127.52 km/h)
90 mph (144.84 km/h)83.9 mph (135.02 km/h)
95 mph (152.89 km/h)88.56 mph (142.52 km/h)
100 mph (160.93 km/h)93.22 mph (150.02 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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