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 335/35r18 Tire Comparison Side By Side
  345/35-15 335/35-18 Difference
Diameter inches (mm) 24.51 (622.5) 27.23 (691.7) 2.72 (69.2) 11.1%
Width inches (mm) 13.58 (345) 13.19 (335) -0.39 (-10) -2.9%
Circum. inches (mm) 76.99 (1955.64) 85.55 (2173.04) 8.56 (217.4) 11.1%
Sidewall Height inches (mm) 4.75 (120.75) 4.62 (117.25) -0.14 (-3.5) -2.9%
Revolutions per mile (km) 822.92 (511.34) 740.6 (460.18) -82.33 (-51.16) -10%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.22 mph (35.76 km/h)
25 mph (40.23 km/h)27.78 mph (44.71 km/h)
30 mph (48.28 km/h)33.33 mph (53.65 km/h)
35 mph (56.33 km/h)38.89 mph (62.59 km/h)
40 mph (64.37 km/h)44.45 mph (71.53 km/h)
45 mph (72.42 km/h)50 mph (80.47 km/h)
50 mph (80.47 km/h)55.56 mph (89.41 km/h)
55 mph (88.51 km/h)61.11 mph (98.35 km/h)
60 mph (96.56 km/h)66.67 mph (107.29 km/h)
65 mph (104.61 km/h)72.23 mph (116.24 km/h)
70 mph (112.65 km/h)77.78 mph (125.18 km/h)
75 mph (120.7 km/h)83.34 mph (134.12 km/h)
80 mph (128.75 km/h)88.89 mph (143.06 km/h)
85 mph (136.79 km/h)94.45 mph (152 km/h)
90 mph (144.84 km/h)100 mph (160.94 km/h)
95 mph (152.89 km/h)105.56 mph (169.88 km/h)
100 mph (160.93 km/h)111.12 mph (178.82 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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