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 195/70r15 Tire Comparison Side By Side
  25/7.5-15 195/70-15 Difference
Diameter inches (mm) 25.08 (636.94) 25.75 (654) 0.67 (17.06) 2.7%
Width inches (mm) 7.52 (191) 7.68 (195) 0.16 (4) 2.1%
Circum. inches (mm) 78.78 (2001.01) 80.89 (2054.6) 2.11 (53.6) 2.7%
Sidewall Height inches (mm) 5.04 (127.97) 5.37 (136.5) 0.34 (8.53) 6.7%
Revolutions per mile (km) 804.27 (499.75) 783.29 (486.71) -20.98 (-13.04) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.54 mph (33.05 km/h)
25 mph (40.23 km/h)25.67 mph (41.31 km/h)
30 mph (48.28 km/h)30.8 mph (49.57 km/h)
35 mph (56.33 km/h)35.94 mph (57.84 km/h)
40 mph (64.37 km/h)41.07 mph (66.1 km/h)
45 mph (72.42 km/h)46.21 mph (74.36 km/h)
50 mph (80.47 km/h)51.34 mph (82.62 km/h)
55 mph (88.51 km/h)56.47 mph (90.88 km/h)
60 mph (96.56 km/h)61.61 mph (99.15 km/h)
65 mph (104.61 km/h)66.74 mph (107.41 km/h)
70 mph (112.65 km/h)71.87 mph (115.67 km/h)
75 mph (120.7 km/h)77.01 mph (123.93 km/h)
80 mph (128.75 km/h)82.14 mph (132.2 km/h)
85 mph (136.79 km/h)87.28 mph (140.46 km/h)
90 mph (144.84 km/h)92.41 mph (148.72 km/h)
95 mph (152.89 km/h)97.54 mph (156.98 km/h)
100 mph (160.93 km/h)102.68 mph (165.25 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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