Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r13 vs 145/80r13 Tire Comparison Side By Side
  135/80-13 145/80-13 Difference
Diameter inches (mm) 21.5 (546.2) 22.13 (562.2) 0.63 (16) 2.9%
Width inches (mm) 5.31 (135) 5.71 (145) 0.39 (10) 7.4%
Circum. inches (mm) 67.56 (1715.94) 69.54 (1766.2) 1.98 (50.27) 2.9%
Sidewall Height inches (mm) 4.25 (108) 4.57 (116) 0.31 (8) 7.4%
Revolutions per mile (km) 937.88 (582.77) 911.19 (566.19) -26.69 (-16.59) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.59 mph (33.13 km/h)
25 mph (40.23 km/h)25.73 mph (41.41 km/h)
30 mph (48.28 km/h)30.88 mph (49.69 km/h)
35 mph (56.33 km/h)36.03 mph (57.98 km/h)
40 mph (64.37 km/h)41.17 mph (66.26 km/h)
45 mph (72.42 km/h)46.32 mph (74.54 km/h)
50 mph (80.47 km/h)51.46 mph (82.82 km/h)
55 mph (88.51 km/h)56.61 mph (91.11 km/h)
60 mph (96.56 km/h)61.76 mph (99.39 km/h)
65 mph (104.61 km/h)66.9 mph (107.67 km/h)
70 mph (112.65 km/h)72.05 mph (115.95 km/h)
75 mph (120.7 km/h)77.2 mph (124.24 km/h)
80 mph (128.75 km/h)82.34 mph (132.52 km/h)
85 mph (136.79 km/h)87.49 mph (140.8 km/h)
90 mph (144.84 km/h)92.64 mph (149.08 km/h)
95 mph (152.89 km/h)97.78 mph (157.37 km/h)
100 mph (160.93 km/h)102.93 mph (165.65 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
23192694290130293167326633753503368038584055421344994815506252205309563460887075
Better Fuel Economy Factory Ratios Increased Power

Most Popular 135/80-R13 Comparisons

To Top