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
225/75r16 vs 235/85r16 Tire Comparison Side By Side
  225/75-16 235/85-16 Difference
Diameter inches (mm) 29.29 (743.9) 31.73 (805.9) 2.44 (62) 8.3%
Width inches (mm) 8.86 (225) 9.25 (235) 0.39 (10) 4.4%
Circum. inches (mm) 92.01 (2337.03) 99.68 (2531.81) 7.67 (194.78) 8.3%
Sidewall Height inches (mm) 6.64 (168.75) 7.86 (199.75) 1.22 (31) 18.4%
Revolutions per mile (km) 688.63 (427.89) 635.65 (394.97) -52.98 (-32.92) -7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.67 mph (34.87 km/h)
25 mph (40.23 km/h)27.08 mph (43.59 km/h)
30 mph (48.28 km/h)32.5 mph (52.3 km/h)
35 mph (56.33 km/h)37.92 mph (61.02 km/h)
40 mph (64.37 km/h)43.33 mph (69.74 km/h)
45 mph (72.42 km/h)48.75 mph (78.46 km/h)
50 mph (80.47 km/h)54.17 mph (87.17 km/h)
55 mph (88.51 km/h)59.58 mph (95.89 km/h)
60 mph (96.56 km/h)65 mph (104.61 km/h)
65 mph (104.61 km/h)70.42 mph (113.33 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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