Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
145/60r15 vs 155/60r15 Tire Comparison Side By Side
  145/60-15 155/60-15 Difference
Diameter inches (mm) 21.85 (555) 22.32 (567) 0.47 (12) 2.2%
Width inches (mm) 5.71 (145) 6.1 (155) 0.39 (10) 6.9%
Circum. inches (mm) 68.65 (1743.58) 70.13 (1781.28) 1.48 (37.7) 2.2%
Sidewall Height inches (mm) 3.43 (87) 3.66 (93) 0.24 (6) 6.9%
Revolutions per mile (km) 923.01 (573.53) 903.47 (561.39) -19.53 (-12.14) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.43 mph (32.88 km/h)
25 mph (40.23 km/h)25.54 mph (41.1 km/h)
30 mph (48.28 km/h)30.65 mph (49.32 km/h)
35 mph (56.33 km/h)35.76 mph (57.55 km/h)
40 mph (64.37 km/h)40.86 mph (65.77 km/h)
45 mph (72.42 km/h)45.97 mph (73.99 km/h)
50 mph (80.47 km/h)51.08 mph (82.21 km/h)
55 mph (88.51 km/h)56.19 mph (90.43 km/h)
60 mph (96.56 km/h)61.3 mph (98.65 km/h)
65 mph (104.61 km/h)66.41 mph (106.87 km/h)
70 mph (112.65 km/h)71.51 mph (115.09 km/h)
75 mph (120.7 km/h)76.62 mph (123.31 km/h)
80 mph (128.75 km/h)81.73 mph (131.53 km/h)
85 mph (136.79 km/h)86.84 mph (139.75 km/h)
90 mph (144.84 km/h)91.95 mph (147.97 km/h)
95 mph (152.89 km/h)97.05 mph (156.19 km/h)
100 mph (160.93 km/h)102.16 mph (164.41 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
22992671287630043141323833463473364938254021417844614774501951765264558660377015
Better Fuel Economy Factory Ratios Increased Power

Most Popular 145/60-R15 Comparisons

To Top