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
265/70r17 vs 285/75r17 Tire Comparison Side By Side
  265/70-17 285/75-17 Difference
Diameter inches (mm) 31.61 (802.8) 33.83 (859.3) 2.22 (56.5) 7%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 99.29 (2522.07) 106.28 (2699.57) 6.99 (177.5) 7%
Sidewall Height inches (mm) 7.3 (185.5) 8.42 (213.75) 1.11 (28.25) 15.2%
Revolutions per mile (km) 638.1 (396.5) 596.15 (370.43) -41.96 (-26.07) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.41 mph (34.45 km/h)
25 mph (40.23 km/h)26.76 mph (43.07 km/h)
30 mph (48.28 km/h)32.11 mph (51.68 km/h)
35 mph (56.33 km/h)37.46 mph (60.29 km/h)
40 mph (64.37 km/h)42.82 mph (68.9 km/h)
45 mph (72.42 km/h)48.17 mph (77.52 km/h)
50 mph (80.47 km/h)53.52 mph (86.13 km/h)
55 mph (88.51 km/h)58.87 mph (94.74 km/h)
60 mph (96.56 km/h)64.22 mph (103.36 km/h)
65 mph (104.61 km/h)69.57 mph (111.97 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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