Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/45r17 vs 275/40r17 Tire Comparison Side By Side
  325/45-17 275/40-17 Difference
Diameter inches (mm) 28.52 (724.3) 25.66 (651.8) -2.85 (-72.5) -10%
Width inches (mm) 12.8 (325) 10.83 (275) -1.97 (-50) -15.4%
Circum. inches (mm) 89.58 (2275.46) 80.62 (2047.69) -8.97 (-227.77) -10%
Sidewall Height inches (mm) 5.76 (146.25) 4.33 (110) -1.43 (-36.25) -24.8%
Revolutions per mile (km) 707.26 (439.47) 785.93 (488.35) 78.67 (48.88) 11.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18 mph (28.97 km/h)
25 mph (40.23 km/h)22.5 mph (36.21 km/h)
30 mph (48.28 km/h)27 mph (43.45 km/h)
35 mph (56.33 km/h)31.5 mph (50.69 km/h)
40 mph (64.37 km/h)36 mph (57.93 km/h)
45 mph (72.42 km/h)40.5 mph (65.17 km/h)
50 mph (80.47 km/h)45 mph (72.41 km/h)
55 mph (88.51 km/h)49.49 mph (79.65 km/h)
60 mph (96.56 km/h)53.99 mph (86.9 km/h)
65 mph (104.61 km/h)58.49 mph (94.14 km/h)
70 mph (112.65 km/h)62.99 mph (101.38 km/h)
75 mph (120.7 km/h)67.49 mph (108.62 km/h)
80 mph (128.75 km/h)71.99 mph (115.86 km/h)
85 mph (136.79 km/h)76.49 mph (123.1 km/h)
90 mph (144.84 km/h)80.99 mph (130.34 km/h)
95 mph (152.89 km/h)85.49 mph (137.58 km/h)
100 mph (160.93 km/h)89.99 mph (144.83 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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