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
205/75r15 vs 215/65r15 Tire Comparison Side By Side
  205/75-15 215/65-15 Difference
Diameter inches (mm) 27.11 (688.5) 26 (660.5) -1.1 (-28) -4.1%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 85.16 (2162.99) 81.69 (2075.02) -3.46 (-87.96) -4.1%
Sidewall Height inches (mm) 6.05 (153.75) 5.5 (139.75) -0.55 (-14) -9.1%
Revolutions per mile (km) 744.04 (462.32) 775.58 (481.92) 31.54 (19.6) 4.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.19 mph (30.88 km/h)
25 mph (40.23 km/h)23.98 mph (38.6 km/h)
30 mph (48.28 km/h)28.78 mph (46.32 km/h)
35 mph (56.33 km/h)33.58 mph (54.04 km/h)
40 mph (64.37 km/h)38.37 mph (61.76 km/h)
45 mph (72.42 km/h)43.17 mph (69.48 km/h)
50 mph (80.47 km/h)47.97 mph (77.19 km/h)
55 mph (88.51 km/h)52.76 mph (84.91 km/h)
60 mph (96.56 km/h)57.56 mph (92.63 km/h)
65 mph (104.61 km/h)62.36 mph (100.35 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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