Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/35r20 vs 315/35r20 Tire Comparison Side By Side
  285/35-20 315/35-20 Difference
Diameter inches (mm) 27.85 (707.5) 28.68 (728.5) 0.83 (21) 3%
Width inches (mm) 11.22 (285) 12.4 (315) 1.18 (30) 10.5%
Circum. inches (mm) 87.51 (2222.68) 90.1 (2288.65) 2.6 (65.97) 3%
Sidewall Height inches (mm) 3.93 (99.75) 4.34 (110.25) 0.41 (10.5) 10.5%
Revolutions per mile (km) 724.06 (449.91) 703.18 (436.94) -20.87 (-12.97) -2.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.59 mph (33.14 km/h)
25 mph (40.23 km/h)25.74 mph (41.43 km/h)
30 mph (48.28 km/h)30.89 mph (49.71 km/h)
35 mph (56.33 km/h)36.04 mph (58 km/h)
40 mph (64.37 km/h)41.19 mph (66.28 km/h)
45 mph (72.42 km/h)46.34 mph (74.57 km/h)
50 mph (80.47 km/h)51.48 mph (82.86 km/h)
55 mph (88.51 km/h)56.63 mph (91.14 km/h)
60 mph (96.56 km/h)61.78 mph (99.43 km/h)
65 mph (104.61 km/h)66.93 mph (107.71 km/h)
70 mph (112.65 km/h)72.08 mph (116 km/h)
75 mph (120.7 km/h)77.23 mph (124.28 km/h)
80 mph (128.75 km/h)82.37 mph (132.57 km/h)
85 mph (136.79 km/h)87.52 mph (140.85 km/h)
90 mph (144.84 km/h)92.67 mph (149.14 km/h)
95 mph (152.89 km/h)97.82 mph (157.43 km/h)
100 mph (160.93 km/h)102.97 mph (165.71 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
17892079223923382444252026042703284029773130325234723716390640284097434846985460
Better Fuel Economy Factory Ratios Increased Power

Most Popular 285/35-R20 Comparisons

To Top