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
135/70r13 vs 175/55r13 Tire Comparison Side By Side
  135/70-13 175/55-13 Difference
Diameter inches (mm) 20.44 (519.2) 20.58 (522.7) 0.14 (3.5) 0.7%
Width inches (mm) 5.31 (135) 6.89 (175) 1.57 (40) 29.6%
Circum. inches (mm) 64.22 (1631.11) 64.65 (1642.11) 0.43 (11) 0.7%
Sidewall Height inches (mm) 3.72 (94.5) 3.79 (96.25) 0.07 (1.75) 1.9%
Revolutions per mile (km) 986.65 (613.08) 980.05 (608.97) -6.61 (-4.11) -0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.13 mph (32.4 km/h)
25 mph (40.23 km/h)25.17 mph (40.5 km/h)
30 mph (48.28 km/h)30.2 mph (48.61 km/h)
35 mph (56.33 km/h)35.24 mph (56.71 km/h)
40 mph (64.37 km/h)40.27 mph (64.81 km/h)
45 mph (72.42 km/h)45.3 mph (72.91 km/h)
50 mph (80.47 km/h)50.34 mph (81.01 km/h)
55 mph (88.51 km/h)55.37 mph (89.11 km/h)
60 mph (96.56 km/h)60.4 mph (97.21 km/h)
65 mph (104.61 km/h)65.44 mph (105.31 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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