Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r14 vs 25/8.5r14 Tire Comparison Side By Side
  205/80-14 25/8.5-14 Difference
Diameter inches (mm) 26.91 (683.6) 25.06 (636.4) -1.86 (-47.2) -6.9%
Width inches (mm) 8.07 (205) 8.5 (216) 0.43 (11) 5.4%
Circum. inches (mm) 84.55 (2147.59) 78.71 (1999.31) -5.84 (-148.28) -6.9%
Sidewall Height inches (mm) 6.46 (164) 5.53 (140.4) -0.93 (-23.6) -14.4%
Revolutions per mile (km) 749.37 (465.64) 804.95 (500.17) 55.58 (34.53) 7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.62 mph (29.96 km/h)
25 mph (40.23 km/h)23.27 mph (37.46 km/h)
30 mph (48.28 km/h)27.93 mph (44.95 km/h)
35 mph (56.33 km/h)32.58 mph (52.44 km/h)
40 mph (64.37 km/h)37.24 mph (59.93 km/h)
45 mph (72.42 km/h)41.89 mph (67.42 km/h)
50 mph (80.47 km/h)46.55 mph (74.91 km/h)
55 mph (88.51 km/h)51.2 mph (82.4 km/h)
60 mph (96.56 km/h)55.86 mph (89.89 km/h)
65 mph (104.61 km/h)60.51 mph (97.38 km/h)
70 mph (112.65 km/h)65.17 mph (104.88 km/h)
75 mph (120.7 km/h)69.82 mph (112.37 km/h)
80 mph (128.75 km/h)74.48 mph (119.86 km/h)
85 mph (136.79 km/h)79.13 mph (127.35 km/h)
90 mph (144.84 km/h)83.79 mph (134.84 km/h)
95 mph (152.89 km/h)88.44 mph (142.33 km/h)
100 mph (160.93 km/h)93.1 mph (149.82 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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