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 145/70r14 Tire Comparison Side By Side
  145/60-15 145/70-14 Difference
Diameter inches (mm) 21.85 (555) 21.99 (558.6) 0.14 (3.6) 0.6%
Width inches (mm) 5.71 (145) 5.71 (145) 0 (0) 0%
Circum. inches (mm) 68.65 (1743.58) 69.09 (1754.89) 0.45 (11.31) 0.6%
Sidewall Height inches (mm) 3.43 (87) 4 (101.5) 0.57 (14.5) 16.7%
Revolutions per mile (km) 923.01 (573.53) 917.06 (569.83) -5.95 (-3.7) -0.6%

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)25.16 mph (40.49 km/h)
30 mph (48.28 km/h)30.19 mph (48.59 km/h)
35 mph (56.33 km/h)35.23 mph (56.69 km/h)
40 mph (64.37 km/h)40.26 mph (64.79 km/h)
45 mph (72.42 km/h)45.29 mph (72.89 km/h)
50 mph (80.47 km/h)50.32 mph (80.99 km/h)
55 mph (88.51 km/h)55.36 mph (89.09 km/h)
60 mph (96.56 km/h)60.39 mph (97.19 km/h)
65 mph (104.61 km/h)65.42 mph (105.29 km/h)
70 mph (112.65 km/h)70.45 mph (113.39 km/h)
75 mph (120.7 km/h)75.49 mph (121.48 km/h)
80 mph (128.75 km/h)80.52 mph (129.58 km/h)
85 mph (136.79 km/h)85.55 mph (137.68 km/h)
90 mph (144.84 km/h)90.58 mph (145.78 km/h)
95 mph (152.89 km/h)95.62 mph (153.88 km/h)
100 mph (160.93 km/h)100.65 mph (161.98 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 145/60-R15 Comparisons

To Top