Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r18 vs 275/40r18 Tire Comparison Side By Side
  235/50-18 275/40-18 Difference
Diameter inches (mm) 27.25 (692.2) 26.66 (677.2) -0.59 (-15) -2.2%
Width inches (mm) 9.25 (235) 10.83 (275) 1.57 (40) 17%
Circum. inches (mm) 85.61 (2174.61) 83.76 (2127.49) -1.86 (-47.12) -2.2%
Sidewall Height inches (mm) 4.63 (117.5) 4.33 (110) -0.3 (-7.5) -6.4%
Revolutions per mile (km) 740.06 (459.85) 756.45 (470.04) 16.39 (10.19) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.57 mph (31.49 km/h)
25 mph (40.23 km/h)24.46 mph (39.36 km/h)
30 mph (48.28 km/h)29.35 mph (47.23 km/h)
35 mph (56.33 km/h)34.24 mph (55.11 km/h)
40 mph (64.37 km/h)39.13 mph (62.98 km/h)
45 mph (72.42 km/h)44.02 mph (70.85 km/h)
50 mph (80.47 km/h)48.92 mph (78.72 km/h)
55 mph (88.51 km/h)53.81 mph (86.6 km/h)
60 mph (96.56 km/h)58.7 mph (94.47 km/h)
65 mph (104.61 km/h)63.59 mph (102.34 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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