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
245/75r17 vs 235/80r17 Tire Comparison Side By Side
  245/75-17 235/80-17 Difference
Diameter inches (mm) 31.47 (799.3) 31.8 (807.8) 0.33 (8.5) 1.1%
Width inches (mm) 9.65 (245) 9.25 (235) -0.39 (-10) -4.1%
Circum. inches (mm) 98.86 (2511.08) 99.91 (2537.78) 1.05 (26.7) 1.1%
Sidewall Height inches (mm) 7.23 (183.75) 7.4 (188) 0.17 (4.25) 2.3%
Revolutions per mile (km) 640.9 (398.24) 634.15 (394.04) -6.74 (-4.19) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.21 mph (32.53 km/h)
25 mph (40.23 km/h)25.27 mph (40.66 km/h)
30 mph (48.28 km/h)30.32 mph (48.79 km/h)
35 mph (56.33 km/h)35.37 mph (56.93 km/h)
40 mph (64.37 km/h)40.43 mph (65.06 km/h)
45 mph (72.42 km/h)45.48 mph (73.19 km/h)
50 mph (80.47 km/h)50.53 mph (81.32 km/h)
55 mph (88.51 km/h)55.58 mph (89.46 km/h)
60 mph (96.56 km/h)60.64 mph (97.59 km/h)
65 mph (104.61 km/h)65.69 mph (105.72 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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