Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/35r19 vs 345/80r17 Tire Comparison Side By Side
  345/35-19 345/80-17 Difference
Diameter inches (mm) 28.51 (724.1) 38.73 (983.8) 10.22 (259.7) 35.9%
Width inches (mm) 13.58 (345) 13.58 (345) 0 (0) 0%
Circum. inches (mm) 89.56 (2274.83) 121.68 (3090.7) 32.12 (815.87) 35.9%
Sidewall Height inches (mm) 4.75 (120.75) 10.87 (276) 6.11 (155.25) 128.6%
Revolutions per mile (km) 707.46 (439.59) 520.71 (323.55) -186.75 (-116.04) -26.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)27.17 mph (43.73 km/h)
25 mph (40.23 km/h)33.97 mph (54.66 km/h)
30 mph (48.28 km/h)40.76 mph (65.6 km/h)
35 mph (56.33 km/h)47.55 mph (76.53 km/h)
40 mph (64.37 km/h)54.35 mph (87.46 km/h)
45 mph (72.42 km/h)61.14 mph (98.39 km/h)
50 mph (80.47 km/h)67.93 mph (109.33 km/h)
55 mph (88.51 km/h)74.73 mph (120.26 km/h)
60 mph (96.56 km/h)81.52 mph (131.19 km/h)
65 mph (104.61 km/h)88.31 mph (142.13 km/h)
70 mph (112.65 km/h)95.11 mph (153.06 km/h)
75 mph (120.7 km/h)101.9 mph (163.99 km/h)
80 mph (128.75 km/h)108.69 mph (174.92 km/h)
85 mph (136.79 km/h)115.49 mph (185.86 km/h)
90 mph (144.84 km/h)122.28 mph (196.79 km/h)
95 mph (152.89 km/h)129.07 mph (207.72 km/h)
100 mph (160.93 km/h)135.87 mph (218.65 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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