Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/55r13 vs 170/65r13 Tire Comparison Side By Side
  165/55-13 170/65-13 Difference
Diameter inches (mm) 20.15 (511.7) 21.7 (551.2) 1.56 (39.5) 7.7%
Width inches (mm) 6.5 (165) 6.69 (170) 0.2 (5) 3%
Circum. inches (mm) 63.29 (1607.55) 68.18 (1731.65) 4.89 (124.09) 7.7%
Sidewall Height inches (mm) 3.57 (90.75) 4.35 (110.5) 0.78 (19.75) 21.8%
Revolutions per mile (km) 1001.11 (622.06) 929.37 (577.48) -71.74 (-44.58) -7.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.54 mph (34.67 km/h)
25 mph (40.23 km/h)26.93 mph (43.34 km/h)
30 mph (48.28 km/h)32.32 mph (52.01 km/h)
35 mph (56.33 km/h)37.7 mph (60.68 km/h)
40 mph (64.37 km/h)43.09 mph (69.34 km/h)
45 mph (72.42 km/h)48.47 mph (78.01 km/h)
50 mph (80.47 km/h)53.86 mph (86.68 km/h)
55 mph (88.51 km/h)59.25 mph (95.35 km/h)
60 mph (96.56 km/h)64.63 mph (104.01 km/h)
65 mph (104.61 km/h)70.02 mph (112.68 km/h)
70 mph (112.65 km/h)75.4 mph (121.35 km/h)
75 mph (120.7 km/h)80.79 mph (130.02 km/h)
80 mph (128.75 km/h)86.18 mph (138.69 km/h)
85 mph (136.79 km/h)91.56 mph (147.35 km/h)
90 mph (144.84 km/h)96.95 mph (156.02 km/h)
95 mph (152.89 km/h)102.33 mph (164.69 km/h)
100 mph (160.93 km/h)107.72 mph (173.36 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Better Fuel Economy Factory Ratios Increased Power

Most Popular 165/55-R13 Comparisons

To Top