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 285/70r17 Tire Comparison Side By Side
  265/70-17 285/70-17 Difference
Diameter inches (mm) 31.61 (802.8) 32.71 (830.8) 1.1 (28) 3.5%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 99.29 (2522.07) 102.76 (2610.04) 3.46 (87.96) 3.5%
Sidewall Height inches (mm) 7.3 (185.5) 7.85 (199.5) 0.55 (14) 7.5%
Revolutions per mile (km) 638.1 (396.5) 616.6 (383.14) -21.51 (-13.36) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.7 mph (33.31 km/h)
25 mph (40.23 km/h)25.87 mph (41.64 km/h)
30 mph (48.28 km/h)31.05 mph (49.96 km/h)
35 mph (56.33 km/h)36.22 mph (58.29 km/h)
40 mph (64.37 km/h)41.4 mph (66.62 km/h)
45 mph (72.42 km/h)46.57 mph (74.95 km/h)
50 mph (80.47 km/h)51.74 mph (83.27 km/h)
55 mph (88.51 km/h)56.92 mph (91.6 km/h)
60 mph (96.56 km/h)62.09 mph (99.93 km/h)
65 mph (104.61 km/h)67.27 mph (108.26 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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