Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/35r18 vs 255/35r18 Tire Comparison Side By Side
  235/35-18 255/35-18 Difference
Diameter inches (mm) 24.48 (621.7) 25.03 (635.7) 0.55 (14) 2.3%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 76.89 (1953.13) 78.63 (1997.11) 1.73 (43.98) 2.3%
Sidewall Height inches (mm) 3.24 (82.25) 3.51 (89.25) 0.28 (7) 8.5%
Revolutions per mile (km) 823.98 (512) 805.84 (500.72) -18.15 (-11.28) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.45 mph (32.91 km/h)
25 mph (40.23 km/h)25.56 mph (41.14 km/h)
30 mph (48.28 km/h)30.68 mph (49.37 km/h)
35 mph (56.33 km/h)35.79 mph (57.6 km/h)
40 mph (64.37 km/h)40.9 mph (65.82 km/h)
45 mph (72.42 km/h)46.01 mph (74.05 km/h)
50 mph (80.47 km/h)51.13 mph (82.28 km/h)
55 mph (88.51 km/h)56.24 mph (90.51 km/h)
60 mph (96.56 km/h)61.35 mph (98.74 km/h)
65 mph (104.61 km/h)66.46 mph (106.96 km/h)
70 mph (112.65 km/h)71.58 mph (115.19 km/h)
75 mph (120.7 km/h)76.69 mph (123.42 km/h)
80 mph (128.75 km/h)81.8 mph (131.65 km/h)
85 mph (136.79 km/h)86.91 mph (139.87 km/h)
90 mph (144.84 km/h)92.03 mph (148.1 km/h)
95 mph (152.89 km/h)97.14 mph (156.33 km/h)
100 mph (160.93 km/h)102.25 mph (164.56 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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