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
235/65r17 vs 265/65r17 Tire Comparison Side By Side
  235/65-17 265/65-17 Difference
Diameter inches (mm) 29.03 (737.3) 30.56 (776.3) 1.54 (39) 5.3%
Width inches (mm) 9.25 (235) 10.43 (265) 1.18 (30) 12.8%
Circum. inches (mm) 91.19 (2316.3) 96.02 (2438.82) 4.82 (122.52) 5.3%
Sidewall Height inches (mm) 6.01 (152.75) 6.78 (172.25) 0.77 (19.5) 12.8%
Revolutions per mile (km) 694.79 (431.72) 659.89 (410.03) -34.91 (-21.69) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.06 mph (33.89 km/h)
25 mph (40.23 km/h)26.32 mph (42.36 km/h)
30 mph (48.28 km/h)31.59 mph (50.83 km/h)
35 mph (56.33 km/h)36.85 mph (59.31 km/h)
40 mph (64.37 km/h)42.12 mph (67.78 km/h)
45 mph (72.42 km/h)47.38 mph (76.25 km/h)
50 mph (80.47 km/h)52.64 mph (84.72 km/h)
55 mph (88.51 km/h)57.91 mph (93.2 km/h)
60 mph (96.56 km/h)63.17 mph (101.67 km/h)
65 mph (104.61 km/h)68.44 mph (110.14 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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