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 365/40r26 Tire Comparison Side By Side
  345/35-15 365/40-26 Difference
Diameter inches (mm) 24.51 (622.5) 37.5 (952.4) 12.99 (329.9) 53%
Width inches (mm) 13.58 (345) 14.37 (365) 0.79 (20) 5.8%
Circum. inches (mm) 76.99 (1955.64) 117.8 (2992.05) 40.8 (1036.41) 53%
Sidewall Height inches (mm) 4.75 (120.75) 5.75 (146) 0.99 (25.25) 20.9%
Revolutions per mile (km) 822.92 (511.34) 537.87 (334.22) -285.05 (-177.12) -34.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)30.6 mph (49.24 km/h)
25 mph (40.23 km/h)38.25 mph (61.56 km/h)
30 mph (48.28 km/h)45.9 mph (73.87 km/h)
35 mph (56.33 km/h)53.55 mph (86.18 km/h)
40 mph (64.37 km/h)61.2 mph (98.49 km/h)
45 mph (72.42 km/h)68.85 mph (110.8 km/h)
50 mph (80.47 km/h)76.5 mph (123.11 km/h)
55 mph (88.51 km/h)84.15 mph (135.42 km/h)
60 mph (96.56 km/h)91.8 mph (147.73 km/h)
65 mph (104.61 km/h)99.45 mph (160.05 km/h)
70 mph (112.65 km/h)107.1 mph (172.36 km/h)
75 mph (120.7 km/h)114.75 mph (184.67 km/h)
80 mph (128.75 km/h)122.4 mph (196.98 km/h)
85 mph (136.79 km/h)130.05 mph (209.29 km/h)
90 mph (144.84 km/h)137.7 mph (221.6 km/h)
95 mph (152.89 km/h)145.35 mph (233.91 km/h)
100 mph (160.93 km/h)153 mph (246.22 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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