Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/30r19 vs 355/30r19 Tire Comparison Side By Side
  345/30-19 355/30-19 Difference
Diameter inches (mm) 27.15 (689.6) 27.39 (695.6) 0.24 (6) 0.9%
Width inches (mm) 13.58 (345) 13.98 (355) 0.39 (10) 2.9%
Circum. inches (mm) 85.29 (2166.44) 86.04 (2185.29) 0.74 (18.85) 0.9%
Sidewall Height inches (mm) 4.07 (103.5) 4.19 (106.5) 0.12 (3) 2.9%
Revolutions per mile (km) 742.85 (461.59) 736.44 (457.6) -6.41 (-3.98) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.17 mph (32.47 km/h)
25 mph (40.23 km/h)25.22 mph (40.58 km/h)
30 mph (48.28 km/h)30.26 mph (48.7 km/h)
35 mph (56.33 km/h)35.3 mph (56.82 km/h)
40 mph (64.37 km/h)40.35 mph (64.93 km/h)
45 mph (72.42 km/h)45.39 mph (73.05 km/h)
50 mph (80.47 km/h)50.44 mph (81.17 km/h)
55 mph (88.51 km/h)55.48 mph (89.28 km/h)
60 mph (96.56 km/h)60.52 mph (97.4 km/h)
65 mph (104.61 km/h)65.57 mph (105.52 km/h)
70 mph (112.65 km/h)70.61 mph (113.63 km/h)
75 mph (120.7 km/h)75.65 mph (121.75 km/h)
80 mph (128.75 km/h)80.7 mph (129.87 km/h)
85 mph (136.79 km/h)85.74 mph (137.98 km/h)
90 mph (144.84 km/h)90.78 mph (146.1 km/h)
95 mph (152.89 km/h)95.83 mph (154.22 km/h)
100 mph (160.93 km/h)100.87 mph (162.33 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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