Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r20 vs 275/40r20 Tire Comparison Side By Side
  305/35-20 275/40-20 Difference
Diameter inches (mm) 28.41 (721.5) 28.66 (728) 0.26 (6.5) 0.9%
Width inches (mm) 12.01 (305) 10.83 (275) -1.18 (-30) -9.8%
Circum. inches (mm) 89.24 (2266.66) 90.04 (2287.08) 0.8 (20.42) 0.9%
Sidewall Height inches (mm) 4.2 (106.75) 4.33 (110) 0.13 (3.25) 3%
Revolutions per mile (km) 710.01 (441.18) 703.67 (437.24) -6.34 (-3.94) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.18 mph (32.48 km/h)
25 mph (40.23 km/h)25.23 mph (40.6 km/h)
30 mph (48.28 km/h)30.27 mph (48.72 km/h)
35 mph (56.33 km/h)35.32 mph (56.83 km/h)
40 mph (64.37 km/h)40.36 mph (64.95 km/h)
45 mph (72.42 km/h)45.41 mph (73.07 km/h)
50 mph (80.47 km/h)50.45 mph (81.19 km/h)
55 mph (88.51 km/h)55.5 mph (89.31 km/h)
60 mph (96.56 km/h)60.54 mph (97.43 km/h)
65 mph (104.61 km/h)65.59 mph (105.55 km/h)
70 mph (112.65 km/h)70.63 mph (113.67 km/h)
75 mph (120.7 km/h)75.68 mph (121.79 km/h)
80 mph (128.75 km/h)80.72 mph (129.91 km/h)
85 mph (136.79 km/h)85.77 mph (138.03 km/h)
90 mph (144.84 km/h)90.81 mph (146.15 km/h)
95 mph (152.89 km/h)95.86 mph (154.27 km/h)
100 mph (160.93 km/h)100.9 mph (162.38 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
17912080224023392446252226062705284229793132325434753719390940314100435147025464
Better Fuel Economy Factory Ratios Increased Power

Most Popular 305/35-R20 Comparisons

To Top