Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
25/7.5r15 vs 195/80r15 Tire Comparison Side By Side
  25/7.5-15 195/80-15 Difference
Diameter inches (mm) 25.08 (636.94) 27.28 (693) 2.21 (56.06) 8.8%
Width inches (mm) 7.52 (191) 7.68 (195) 0.16 (4) 2.1%
Circum. inches (mm) 78.78 (2001.01) 85.71 (2177.12) 6.93 (176.12) 8.8%
Sidewall Height inches (mm) 5.04 (127.97) 6.14 (156) 1.1 (28.03) 21.9%
Revolutions per mile (km) 804.27 (499.75) 739.21 (459.32) -65.06 (-40.43) -8.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.76 mph (35.02 km/h)
25 mph (40.23 km/h)27.2 mph (43.77 km/h)
30 mph (48.28 km/h)32.64 mph (52.53 km/h)
35 mph (56.33 km/h)38.08 mph (61.28 km/h)
40 mph (64.37 km/h)43.52 mph (70.04 km/h)
45 mph (72.42 km/h)48.96 mph (78.79 km/h)
50 mph (80.47 km/h)54.4 mph (87.55 km/h)
55 mph (88.51 km/h)59.84 mph (96.3 km/h)
60 mph (96.56 km/h)65.28 mph (105.06 km/h)
65 mph (104.61 km/h)70.72 mph (113.81 km/h)
70 mph (112.65 km/h)76.16 mph (122.57 km/h)
75 mph (120.7 km/h)81.6 mph (131.32 km/h)
80 mph (128.75 km/h)87.04 mph (140.08 km/h)
85 mph (136.79 km/h)92.48 mph (148.83 km/h)
90 mph (144.84 km/h)97.92 mph (157.59 km/h)
95 mph (152.89 km/h)103.36 mph (166.34 km/h)
100 mph (160.93 km/h)108.8 mph (175.1 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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