Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/50r18 vs 235/50r18 Tire Comparison Side By Side
  225/50-18 235/50-18 Difference
Diameter inches (mm) 26.86 (682.2) 27.25 (692.2) 0.39 (10) 1.5%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 84.38 (2143.19) 85.61 (2174.61) 1.24 (31.42) 1.5%
Sidewall Height inches (mm) 4.43 (112.5) 4.63 (117.5) 0.2 (5) 4.4%
Revolutions per mile (km) 750.91 (466.59) 740.06 (459.85) -10.85 (-6.74) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.29 mph (32.66 km/h)
25 mph (40.23 km/h)25.37 mph (40.82 km/h)
30 mph (48.28 km/h)30.44 mph (48.99 km/h)
35 mph (56.33 km/h)35.51 mph (57.15 km/h)
40 mph (64.37 km/h)40.59 mph (65.32 km/h)
45 mph (72.42 km/h)45.66 mph (73.48 km/h)
50 mph (80.47 km/h)50.73 mph (81.65 km/h)
55 mph (88.51 km/h)55.81 mph (89.81 km/h)
60 mph (96.56 km/h)60.88 mph (97.98 km/h)
65 mph (104.61 km/h)65.95 mph (106.14 km/h)
70 mph (112.65 km/h)71.03 mph (114.31 km/h)
75 mph (120.7 km/h)76.1 mph (122.47 km/h)
80 mph (128.75 km/h)81.17 mph (130.64 km/h)
85 mph (136.79 km/h)86.25 mph (138.8 km/h)
90 mph (144.84 km/h)91.32 mph (146.96 km/h)
95 mph (152.89 km/h)96.39 mph (155.13 km/h)
100 mph (160.93 km/h)101.47 mph (163.29 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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