Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/40r20 vs 275/35r21 Tire Comparison Side By Side
  265/40-20 275/35-21 Difference
Diameter inches (mm) 28.35 (720) 28.58 (725.9) 0.23 (5.9) 0.8%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 89.05 (2261.95) 89.78 (2280.48) 0.73 (18.54) 0.8%
Sidewall Height inches (mm) 4.17 (106) 3.79 (96.25) -0.38 (-9.75) -9.2%
Revolutions per mile (km) 711.49 (442.1) 705.7 (438.5) -5.78 (-3.59) -0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.16 mph (32.45 km/h)
25 mph (40.23 km/h)25.2 mph (40.56 km/h)
30 mph (48.28 km/h)30.25 mph (48.68 km/h)
35 mph (56.33 km/h)35.29 mph (56.79 km/h)
40 mph (64.37 km/h)40.33 mph (64.9 km/h)
45 mph (72.42 km/h)45.37 mph (73.01 km/h)
50 mph (80.47 km/h)50.41 mph (81.13 km/h)
55 mph (88.51 km/h)55.45 mph (89.24 km/h)
60 mph (96.56 km/h)60.49 mph (97.35 km/h)
65 mph (104.61 km/h)65.53 mph (105.46 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
17962086224723462453253026142713285029883141326334853729392040434111436447155479
Better Fuel Economy Factory Ratios Increased Power

Most Popular 265/40-R20 Comparisons

To Top