Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/25r20 vs 295/30r20 Tire Comparison Side By Side
  325/25-20 295/30-20 Difference
Diameter inches (mm) 26.4 (670.5) 26.97 (685) 0.57 (14.5) 2.2%
Width inches (mm) 12.8 (325) 11.61 (295) -1.18 (-30) -9.2%
Circum. inches (mm) 82.93 (2106.44) 84.72 (2151.99) 1.79 (45.55) 2.2%
Sidewall Height inches (mm) 3.2 (81.25) 3.48 (88.5) 0.29 (7.25) 8.9%
Revolutions per mile (km) 764.01 (474.73) 747.84 (464.69) -16.17 (-10.05) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.43 mph (32.88 km/h)
25 mph (40.23 km/h)25.54 mph (41.1 km/h)
30 mph (48.28 km/h)30.65 mph (49.32 km/h)
35 mph (56.33 km/h)35.76 mph (57.55 km/h)
40 mph (64.37 km/h)40.87 mph (65.77 km/h)
45 mph (72.42 km/h)45.97 mph (73.99 km/h)
50 mph (80.47 km/h)51.08 mph (82.21 km/h)
55 mph (88.51 km/h)56.19 mph (90.43 km/h)
60 mph (96.56 km/h)61.3 mph (98.65 km/h)
65 mph (104.61 km/h)66.41 mph (106.87 km/h)
70 mph (112.65 km/h)71.51 mph (115.09 km/h)
75 mph (120.7 km/h)76.62 mph (123.31 km/h)
80 mph (128.75 km/h)81.73 mph (131.53 km/h)
85 mph (136.79 km/h)86.84 mph (139.75 km/h)
90 mph (144.84 km/h)91.95 mph (147.97 km/h)
95 mph (152.89 km/h)97.05 mph (156.19 km/h)
100 mph (160.93 km/h)102.16 mph (164.42 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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