Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r15 vs 155/65r15 Tire Comparison Side By Side
  135/70-15 155/65-15 Difference
Diameter inches (mm) 22.44 (570) 22.93 (582.5) 0.49 (12.5) 2.2%
Width inches (mm) 5.31 (135) 6.1 (155) 0.79 (20) 14.8%
Circum. inches (mm) 70.5 (1790.71) 72.05 (1829.98) 1.55 (39.27) 2.2%
Sidewall Height inches (mm) 3.72 (94.5) 3.97 (100.75) 0.25 (6.25) 6.6%
Revolutions per mile (km) 898.72 (558.44) 879.43 (546.45) -19.29 (-11.98) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.44 mph (32.89 km/h)
25 mph (40.23 km/h)25.55 mph (41.12 km/h)
30 mph (48.28 km/h)30.66 mph (49.34 km/h)
35 mph (56.33 km/h)35.77 mph (57.56 km/h)
40 mph (64.37 km/h)40.88 mph (65.79 km/h)
45 mph (72.42 km/h)45.99 mph (74.01 km/h)
50 mph (80.47 km/h)51.1 mph (82.23 km/h)
55 mph (88.51 km/h)56.21 mph (90.46 km/h)
60 mph (96.56 km/h)61.32 mph (98.68 km/h)
65 mph (104.61 km/h)66.43 mph (106.9 km/h)
70 mph (112.65 km/h)71.54 mph (115.12 km/h)
75 mph (120.7 km/h)76.64 mph (123.35 km/h)
80 mph (128.75 km/h)81.75 mph (131.57 km/h)
85 mph (136.79 km/h)86.86 mph (139.79 km/h)
90 mph (144.84 km/h)91.97 mph (148.02 km/h)
95 mph (152.89 km/h)97.08 mph (156.24 km/h)
100 mph (160.93 km/h)102.19 mph (164.46 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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