Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/35r18 vs 345/30r18 Tire Comparison Side By Side
  345/35-18 345/30-18 Difference
Diameter inches (mm) 27.51 (698.7) 26.15 (664.2) -1.36 (-34.5) -4.9%
Width inches (mm) 13.58 (345) 13.58 (345) 0 (0) 0%
Circum. inches (mm) 86.42 (2195.03) 82.15 (2086.65) -4.27 (-108.38) -4.9%
Sidewall Height inches (mm) 4.75 (120.75) 4.07 (103.5) -0.68 (-17.25) -14.3%
Revolutions per mile (km) 733.18 (455.57) 771.26 (479.24) 38.08 (23.66) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.01 mph (30.6 km/h)
25 mph (40.23 km/h)23.77 mph (38.25 km/h)
30 mph (48.28 km/h)28.52 mph (45.9 km/h)
35 mph (56.33 km/h)33.27 mph (53.55 km/h)
40 mph (64.37 km/h)38.02 mph (61.2 km/h)
45 mph (72.42 km/h)42.78 mph (68.84 km/h)
50 mph (80.47 km/h)47.53 mph (76.49 km/h)
55 mph (88.51 km/h)52.28 mph (84.14 km/h)
60 mph (96.56 km/h)57.04 mph (91.79 km/h)
65 mph (104.61 km/h)61.79 mph (99.44 km/h)
70 mph (112.65 km/h)66.54 mph (107.09 km/h)
75 mph (120.7 km/h)71.3 mph (114.74 km/h)
80 mph (128.75 km/h)76.05 mph (122.39 km/h)
85 mph (136.79 km/h)80.8 mph (130.04 km/h)
90 mph (144.84 km/h)85.56 mph (137.69 km/h)
95 mph (152.89 km/h)90.31 mph (145.34 km/h)
100 mph (160.93 km/h)95.06 mph (152.99 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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