Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/60r15 vs 33/10.5r15 Tire Comparison Side By Side
  325/60-15 33/10.5-15 Difference
Diameter inches (mm) 30.35 (771) 33.08 (840.24) 2.73 (69.24) 9%
Width inches (mm) 12.8 (325) 10.51 (267) -2.28 (-58) -17.8%
Circum. inches (mm) 95.36 (2422.17) 103.92 (2639.69) 8.56 (217.52) 9%
Sidewall Height inches (mm) 7.68 (195) 9.04 (229.62) 1.36 (34.62) 17.8%
Revolutions per mile (km) 664.42 (412.85) 609.67 (378.83) -54.75 (-34.02) -8.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.8 mph (35.08 km/h)
25 mph (40.23 km/h)27.25 mph (43.85 km/h)
30 mph (48.28 km/h)32.69 mph (52.62 km/h)
35 mph (56.33 km/h)38.14 mph (61.39 km/h)
40 mph (64.37 km/h)43.59 mph (70.16 km/h)
45 mph (72.42 km/h)49.04 mph (78.92 km/h)
50 mph (80.47 km/h)54.49 mph (87.69 km/h)
55 mph (88.51 km/h)59.94 mph (96.46 km/h)
60 mph (96.56 km/h)65.39 mph (105.23 km/h)
65 mph (104.61 km/h)70.84 mph (114 km/h)
70 mph (112.65 km/h)76.29 mph (122.77 km/h)
75 mph (120.7 km/h)81.74 mph (131.54 km/h)
80 mph (128.75 km/h)87.18 mph (140.31 km/h)
85 mph (136.79 km/h)92.63 mph (149.08 km/h)
90 mph (144.84 km/h)98.08 mph (157.85 km/h)
95 mph (152.89 km/h)103.53 mph (166.62 km/h)
100 mph (160.93 km/h)108.98 mph (175.39 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
15511802194120272119218522582344246325812713281930113222338734933552377040744734
Better Fuel Economy Factory Ratios Increased Power

Most Popular 325/60-R15 Comparisons

To Top