Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/55r15 vs 165/65r15 Tire Comparison Side By Side
  155/55-15 165/65-15 Difference
Diameter inches (mm) 21.71 (551.5) 23.44 (595.5) 1.73 (44) 8%
Width inches (mm) 6.1 (155) 6.5 (165) 0.39 (10) 6.5%
Circum. inches (mm) 68.21 (1732.59) 73.65 (1870.82) 5.44 (138.23) 8%
Sidewall Height inches (mm) 3.36 (85.25) 4.22 (107.25) 0.87 (22) 25.8%
Revolutions per mile (km) 928.87 (577.17) 860.24 (534.52) -68.63 (-42.65) -7.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.6 mph (34.75 km/h)
25 mph (40.23 km/h)26.99 mph (43.44 km/h)
30 mph (48.28 km/h)32.39 mph (52.13 km/h)
35 mph (56.33 km/h)37.79 mph (60.82 km/h)
40 mph (64.37 km/h)43.19 mph (69.51 km/h)
45 mph (72.42 km/h)48.59 mph (78.2 km/h)
50 mph (80.47 km/h)53.99 mph (86.89 km/h)
55 mph (88.51 km/h)59.39 mph (95.58 km/h)
60 mph (96.56 km/h)64.79 mph (104.26 km/h)
65 mph (104.61 km/h)70.19 mph (112.95 km/h)
70 mph (112.65 km/h)75.58 mph (121.64 km/h)
75 mph (120.7 km/h)80.98 mph (130.33 km/h)
80 mph (128.75 km/h)86.38 mph (139.02 km/h)
85 mph (136.79 km/h)91.78 mph (147.71 km/h)
90 mph (144.84 km/h)97.18 mph (156.4 km/h)
95 mph (152.89 km/h)102.58 mph (165.09 km/h)
100 mph (160.93 km/h)107.98 mph (173.77 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
21892543273928602990308331863307347536423829397842484546477949285012531957486679
Better Fuel Economy Factory Ratios Increased Power

Most Popular 155/55-R15 Comparisons

To Top