Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/90r16 vs 155/90r16 Tire Comparison Side By Side
  145/90-16 155/90-16 Difference
Diameter inches (mm) 26.28 (667.4) 26.98 (685.4) 0.71 (18) 2.7%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 82.55 (2096.7) 84.77 (2153.25) 2.23 (56.55) 2.7%
Sidewall Height inches (mm) 5.14 (130.5) 5.49 (139.5) 0.35 (9) 6.9%
Revolutions per mile (km) 767.56 (476.94) 747.4 (464.41) -20.16 (-12.53) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.54 mph (33.06 km/h)
25 mph (40.23 km/h)25.67 mph (41.32 km/h)
30 mph (48.28 km/h)30.81 mph (49.58 km/h)
35 mph (56.33 km/h)35.94 mph (57.85 km/h)
40 mph (64.37 km/h)41.08 mph (66.11 km/h)
45 mph (72.42 km/h)46.21 mph (74.37 km/h)
50 mph (80.47 km/h)51.35 mph (82.64 km/h)
55 mph (88.51 km/h)56.48 mph (90.9 km/h)
60 mph (96.56 km/h)61.62 mph (99.17 km/h)
65 mph (104.61 km/h)66.75 mph (107.43 km/h)
70 mph (112.65 km/h)71.89 mph (115.69 km/h)
75 mph (120.7 km/h)77.02 mph (123.96 km/h)
80 mph (128.75 km/h)82.16 mph (132.22 km/h)
85 mph (136.79 km/h)87.29 mph (140.48 km/h)
90 mph (144.84 km/h)92.43 mph (148.75 km/h)
95 mph (152.89 km/h)97.56 mph (157.01 km/h)
100 mph (160.93 km/h)102.7 mph (165.28 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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