Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/35r15 vs 335/30r18 Tire Comparison Side By Side
  345/35-15 335/30-18 Difference
Diameter inches (mm) 24.51 (622.5) 25.91 (658.2) 1.41 (35.7) 5.7%
Width inches (mm) 13.58 (345) 13.19 (335) -0.39 (-10) -2.9%
Circum. inches (mm) 76.99 (1955.64) 81.41 (2067.8) 4.42 (112.15) 5.7%
Sidewall Height inches (mm) 4.75 (120.75) 3.96 (100.5) -0.8 (-20.25) -16.8%
Revolutions per mile (km) 822.92 (511.34) 778.29 (483.61) -44.63 (-27.73) -5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.15 mph (34.03 km/h)
25 mph (40.23 km/h)26.43 mph (42.54 km/h)
30 mph (48.28 km/h)31.72 mph (51.05 km/h)
35 mph (56.33 km/h)37.01 mph (59.56 km/h)
40 mph (64.37 km/h)42.29 mph (68.07 km/h)
45 mph (72.42 km/h)47.58 mph (76.57 km/h)
50 mph (80.47 km/h)52.87 mph (85.08 km/h)
55 mph (88.51 km/h)58.15 mph (93.59 km/h)
60 mph (96.56 km/h)63.44 mph (102.1 km/h)
65 mph (104.61 km/h)68.73 mph (110.61 km/h)
70 mph (112.65 km/h)74.01 mph (119.11 km/h)
75 mph (120.7 km/h)79.3 mph (127.62 km/h)
80 mph (128.75 km/h)84.59 mph (136.13 km/h)
85 mph (136.79 km/h)89.87 mph (144.64 km/h)
90 mph (144.84 km/h)95.16 mph (153.15 km/h)
95 mph (152.89 km/h)100.45 mph (161.66 km/h)
100 mph (160.93 km/h)105.73 mph (170.16 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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