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
245/70r19.5 vs 225/70r19.5 Tire Comparison Side By Side
  245/70-19.5 225/70-19.5 Difference
Diameter inches (mm) 33 (838.3) 31.9 (810.3) -1.1 (-28) -3.3%
Width inches (mm) 9.65 (245) 8.86 (225) -0.79 (-20) -8.2%
Circum. inches (mm) 103.68 (2633.6) 100.22 (2545.63) -3.46 (-87.96) -3.3%
Sidewall Height inches (mm) 6.75 (171.5) 6.2 (157.5) -0.55 (-14) -8.2%
Revolutions per mile (km) 611.08 (379.71) 632.2 (392.83) 21.12 (13.12) 3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.33 mph (31.11 km/h)
25 mph (40.23 km/h)24.16 mph (38.89 km/h)
30 mph (48.28 km/h)29 mph (46.67 km/h)
35 mph (56.33 km/h)33.83 mph (54.45 km/h)
40 mph (64.37 km/h)38.66 mph (62.22 km/h)
45 mph (72.42 km/h)43.5 mph (70 km/h)
50 mph (80.47 km/h)48.33 mph (77.78 km/h)
55 mph (88.51 km/h)53.16 mph (85.56 km/h)
60 mph (96.56 km/h)58 mph (93.34 km/h)
65 mph (104.61 km/h)62.83 mph (101.11 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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