Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
325/30r20 vs 335/25r20 Tire Comparison Side By Side
  325/30-20 335/25-20 Difference
Diameter inches (mm) 27.68 (703) 26.59 (675.5) -1.08 (-27.5) -3.9%
Width inches (mm) 12.8 (325) 13.19 (335) 0.39 (10) 3.1%
Circum. inches (mm) 86.95 (2208.54) 83.55 (2122.15) -3.4 (-86.39) -3.9%
Sidewall Height inches (mm) 3.84 (97.5) 3.3 (83.75) -0.54 (-13.75) -14.1%
Revolutions per mile (km) 728.69 (452.79) 758.36 (471.22) 29.67 (18.43) 4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.22 mph (30.93 km/h)
25 mph (40.23 km/h)24.02 mph (38.66 km/h)
30 mph (48.28 km/h)28.83 mph (46.39 km/h)
35 mph (56.33 km/h)33.63 mph (54.12 km/h)
40 mph (64.37 km/h)38.44 mph (61.86 km/h)
45 mph (72.42 km/h)43.24 mph (69.59 km/h)
50 mph (80.47 km/h)48.04 mph (77.32 km/h)
55 mph (88.51 km/h)52.85 mph (85.05 km/h)
60 mph (96.56 km/h)57.65 mph (92.78 km/h)
65 mph (104.61 km/h)62.46 mph (100.52 km/h)
70 mph (112.65 km/h)67.26 mph (108.25 km/h)
75 mph (120.7 km/h)72.07 mph (115.98 km/h)
80 mph (128.75 km/h)76.87 mph (123.71 km/h)
85 mph (136.79 km/h)81.67 mph (131.44 km/h)
90 mph (144.84 km/h)86.48 mph (139.18 km/h)
95 mph (152.89 km/h)91.28 mph (146.91 km/h)
100 mph (160.93 km/h)96.09 mph (154.64 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
19302242241425212636271828092915306332113375350737454008421343444418468950675888
Better Fuel Economy Factory Ratios Increased Power

Most Popular 325/30-R20 Comparisons

To Top