Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/82r14 vs 185/82r14 Tire Comparison Side By Side
  175/82-14 185/82-14 Difference
Diameter inches (mm) 25.3 (642.6) 25.94 (659) 0.65 (16.4) 2.6%
Width inches (mm) 6.89 (175) 7.28 (185) 0.39 (10) 5.7%
Circum. inches (mm) 79.48 (2018.79) 81.51 (2070.31) 2.03 (51.52) 2.6%
Sidewall Height inches (mm) 5.65 (143.5) 5.97 (151.7) 0.32 (8.2) 5.7%
Revolutions per mile (km) 797.18 (495.35) 777.34 (483.02) -19.84 (-12.33) -2.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.51 mph (33.01 km/h)
25 mph (40.23 km/h)25.64 mph (41.26 km/h)
30 mph (48.28 km/h)30.77 mph (49.51 km/h)
35 mph (56.33 km/h)35.89 mph (57.76 km/h)
40 mph (64.37 km/h)41.02 mph (66.02 km/h)
45 mph (72.42 km/h)46.15 mph (74.27 km/h)
50 mph (80.47 km/h)51.28 mph (82.52 km/h)
55 mph (88.51 km/h)56.4 mph (90.77 km/h)
60 mph (96.56 km/h)61.53 mph (99.03 km/h)
65 mph (104.61 km/h)66.66 mph (107.28 km/h)
70 mph (112.65 km/h)71.79 mph (115.53 km/h)
75 mph (120.7 km/h)76.91 mph (123.78 km/h)
80 mph (128.75 km/h)82.04 mph (132.03 km/h)
85 mph (136.79 km/h)87.17 mph (140.29 km/h)
90 mph (144.84 km/h)92.3 mph (148.54 km/h)
95 mph (152.89 km/h)97.42 mph (156.79 km/h)
100 mph (160.93 km/h)102.55 mph (165.04 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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