Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r14 vs 27/8.5r14 Tire Comparison Side By Side
  165/75-14 27/8.5-14 Difference
Diameter inches (mm) 23.74 (603.1) 26.93 (683.92) 3.18 (80.82) 13.4%
Width inches (mm) 6.5 (165) 8.5 (216) 2.01 (51) 30.9%
Circum. inches (mm) 74.59 (1894.69) 84.59 (2148.6) 10 (253.9) 13.4%
Sidewall Height inches (mm) 4.87 (123.75) 6.46 (164.16) 1.59 (40.41) 32.7%
Revolutions per mile (km) 849.39 (527.79) 749.02 (465.42) -100.37 (-62.37) -11.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.68 mph (36.5 km/h)
25 mph (40.23 km/h)28.35 mph (45.63 km/h)
30 mph (48.28 km/h)34.02 mph (54.75 km/h)
35 mph (56.33 km/h)39.69 mph (63.88 km/h)
40 mph (64.37 km/h)45.36 mph (73 km/h)
45 mph (72.42 km/h)51.03 mph (82.13 km/h)
50 mph (80.47 km/h)56.7 mph (91.25 km/h)
55 mph (88.51 km/h)62.37 mph (100.38 km/h)
60 mph (96.56 km/h)68.04 mph (109.5 km/h)
65 mph (104.61 km/h)73.71 mph (118.63 km/h)
70 mph (112.65 km/h)79.38 mph (127.75 km/h)
75 mph (120.7 km/h)85.05 mph (136.88 km/h)
80 mph (128.75 km/h)90.72 mph (146 km/h)
85 mph (136.79 km/h)96.39 mph (155.13 km/h)
90 mph (144.84 km/h)102.06 mph (164.25 km/h)
95 mph (152.89 km/h)107.73 mph (173.38 km/h)
100 mph (160.93 km/h)113.4 mph (182.5 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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