Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/70r18 vs 305/70r17 Tire Comparison Side By Side
  275/70-18 305/70-17 Difference
Diameter inches (mm) 33.16 (842.2) 33.81 (858.8) 0.65 (16.6) 2%
Width inches (mm) 10.83 (275) 12.01 (305) 1.18 (30) 10.9%
Circum. inches (mm) 104.17 (2645.85) 106.22 (2698) 2.05 (52.15) 2%
Sidewall Height inches (mm) 7.58 (192.5) 8.41 (213.5) 0.83 (21) 10.9%
Revolutions per mile (km) 608.25 (377.95) 596.5 (370.64) -11.76 (-7.31) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.39 mph (32.82 km/h)
25 mph (40.23 km/h)25.49 mph (41.03 km/h)
30 mph (48.28 km/h)30.59 mph (49.23 km/h)
35 mph (56.33 km/h)35.69 mph (57.44 km/h)
40 mph (64.37 km/h)40.79 mph (65.64 km/h)
45 mph (72.42 km/h)45.89 mph (73.85 km/h)
50 mph (80.47 km/h)50.99 mph (82.05 km/h)
55 mph (88.51 km/h)56.08 mph (90.26 km/h)
60 mph (96.56 km/h)61.18 mph (98.46 km/h)
65 mph (104.61 km/h)66.28 mph (106.67 km/h)
70 mph (112.65 km/h)71.38 mph (114.87 km/h)
75 mph (120.7 km/h)76.48 mph (123.08 km/h)
80 mph (128.75 km/h)81.58 mph (131.29 km/h)
85 mph (136.79 km/h)86.68 mph (139.49 km/h)
90 mph (144.84 km/h)91.77 mph (147.7 km/h)
95 mph (152.89 km/h)96.87 mph (155.9 km/h)
100 mph (160.93 km/h)101.97 mph (164.11 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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