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
265/70r16 vs 305/55r20 Tire Comparison Side By Side
  265/70-16 305/55-20 Difference
Diameter inches (mm) 30.61 (777.4) 33.21 (843.5) 2.6 (66.1) 8.5%
Width inches (mm) 10.43 (265) 12.01 (305) 1.57 (40) 15.1%
Circum. inches (mm) 96.15 (2442.27) 104.33 (2649.93) 8.18 (207.66) 8.5%
Sidewall Height inches (mm) 7.3 (185.5) 6.6 (167.75) -0.7 (-17.75) -9.6%
Revolutions per mile (km) 658.95 (409.45) 607.31 (377.37) -51.64 (-32.09) -7.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.7 mph (34.92 km/h)
25 mph (40.23 km/h)27.13 mph (43.65 km/h)
30 mph (48.28 km/h)32.55 mph (52.39 km/h)
35 mph (56.33 km/h)37.98 mph (61.12 km/h)
40 mph (64.37 km/h)43.4 mph (69.85 km/h)
45 mph (72.42 km/h)48.83 mph (78.58 km/h)
50 mph (80.47 km/h)54.25 mph (87.31 km/h)
55 mph (88.51 km/h)59.68 mph (96.04 km/h)
60 mph (96.56 km/h)65.1 mph (104.77 km/h)
65 mph (104.61 km/h)70.53 mph (113.5 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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