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
245/75r16 vs 315/75r16 Tire Comparison Side By Side
  245/75-16 315/75-16 Difference
Diameter inches (mm) 30.47 (773.9) 34.6 (878.9) 4.13 (105) 13.6%
Width inches (mm) 9.65 (245) 12.4 (315) 2.76 (70) 28.6%
Circum. inches (mm) 95.72 (2431.28) 108.71 (2761.15) 12.99 (329.87) 13.6%
Sidewall Height inches (mm) 7.23 (183.75) 9.3 (236.25) 2.07 (52.5) 28.6%
Revolutions per mile (km) 661.93 (411.31) 582.85 (362.17) -79.08 (-49.14) -11.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.71 mph (36.55 km/h)
25 mph (40.23 km/h)28.39 mph (45.69 km/h)
30 mph (48.28 km/h)34.07 mph (54.83 km/h)
35 mph (56.33 km/h)39.75 mph (63.97 km/h)
40 mph (64.37 km/h)45.43 mph (73.11 km/h)
45 mph (72.42 km/h)51.11 mph (82.25 km/h)
50 mph (80.47 km/h)56.78 mph (91.38 km/h)
55 mph (88.51 km/h)62.46 mph (100.52 km/h)
60 mph (96.56 km/h)68.14 mph (109.66 km/h)
65 mph (104.61 km/h)73.82 mph (118.8 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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