Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r18 vs 275/40r18 Tire Comparison Side By Side
  305/35-18 275/40-18 Difference
Diameter inches (mm) 26.41 (670.7) 26.66 (677.2) 0.26 (6.5) 1%
Width inches (mm) 12.01 (305) 10.83 (275) -1.18 (-30) -9.8%
Circum. inches (mm) 82.96 (2107.07) 83.76 (2127.49) 0.8 (20.42) 1%
Sidewall Height inches (mm) 4.2 (106.75) 4.33 (110) 0.13 (3.25) 3%
Revolutions per mile (km) 763.78 (474.59) 756.45 (470.04) -7.33 (-4.56) -1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.19 mph (32.5 km/h)
25 mph (40.23 km/h)25.24 mph (40.62 km/h)
30 mph (48.28 km/h)30.29 mph (48.75 km/h)
35 mph (56.33 km/h)35.34 mph (56.87 km/h)
40 mph (64.37 km/h)40.39 mph (65 km/h)
45 mph (72.42 km/h)45.44 mph (73.12 km/h)
50 mph (80.47 km/h)50.48 mph (81.25 km/h)
55 mph (88.51 km/h)55.53 mph (89.37 km/h)
60 mph (96.56 km/h)60.58 mph (97.5 km/h)
65 mph (104.61 km/h)65.63 mph (105.62 km/h)
70 mph (112.65 km/h)70.68 mph (113.75 km/h)
75 mph (120.7 km/h)75.73 mph (121.87 km/h)
80 mph (128.75 km/h)80.78 mph (130 km/h)
85 mph (136.79 km/h)85.82 mph (138.12 km/h)
90 mph (144.84 km/h)90.87 mph (146.24 km/h)
95 mph (152.89 km/h)95.92 mph (154.37 km/h)
100 mph (160.93 km/h)100.97 mph (162.49 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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