Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r18 vs 275/65r18 Tire Comparison Side By Side
  235/50-18 275/65-18 Difference
Diameter inches (mm) 27.25 (692.2) 32.07 (814.7) 4.82 (122.5) 17.7%
Width inches (mm) 9.25 (235) 10.83 (275) 1.57 (40) 17%
Circum. inches (mm) 85.61 (2174.61) 100.77 (2559.46) 15.15 (384.85) 17.7%
Sidewall Height inches (mm) 4.63 (117.5) 7.04 (178.75) 2.41 (61.25) 52.1%
Revolutions per mile (km) 740.06 (459.85) 628.78 (390.71) -111.28 (-69.14) -15%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.54 mph (37.88 km/h)
25 mph (40.23 km/h)29.42 mph (47.35 km/h)
30 mph (48.28 km/h)35.31 mph (56.82 km/h)
35 mph (56.33 km/h)41.19 mph (66.3 km/h)
40 mph (64.37 km/h)47.08 mph (75.77 km/h)
45 mph (72.42 km/h)52.96 mph (85.24 km/h)
50 mph (80.47 km/h)58.85 mph (94.71 km/h)
55 mph (88.51 km/h)64.73 mph (104.18 km/h)
60 mph (96.56 km/h)70.62 mph (113.65 km/h)
65 mph (104.61 km/h)76.5 mph (123.12 km/h)
70 mph (112.65 km/h)82.39 mph (132.59 km/h)
75 mph (120.7 km/h)88.27 mph (142.06 km/h)
80 mph (128.75 km/h)94.16 mph (151.53 km/h)
85 mph (136.79 km/h)100.04 mph (161 km/h)
90 mph (144.84 km/h)105.93 mph (170.47 km/h)
95 mph (152.89 km/h)111.81 mph (179.94 km/h)
100 mph (160.93 km/h)117.7 mph (189.42 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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