Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
355/25r21 vs 265/75r16 Tire Comparison Side By Side
  355/25-21 265/75-16 Difference
Diameter inches (mm) 27.99 (710.9) 31.65 (803.9) 3.66 (93) 13.1%
Width inches (mm) 13.98 (355) 10.43 (265) -3.54 (-90) -25.4%
Circum. inches (mm) 87.93 (2233.36) 99.43 (2525.53) 11.5 (292.17) 13.1%
Sidewall Height inches (mm) 3.49 (88.75) 7.82 (198.75) 4.33 (110) 123.9%
Revolutions per mile (km) 720.59 (447.76) 637.23 (395.96) -83.36 (-51.8) -11.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.62 mph (36.4 km/h)
25 mph (40.23 km/h)28.27 mph (45.5 km/h)
30 mph (48.28 km/h)33.92 mph (54.6 km/h)
35 mph (56.33 km/h)39.58 mph (63.7 km/h)
40 mph (64.37 km/h)45.23 mph (72.8 km/h)
45 mph (72.42 km/h)50.89 mph (81.89 km/h)
50 mph (80.47 km/h)56.54 mph (90.99 km/h)
55 mph (88.51 km/h)62.2 mph (100.09 km/h)
60 mph (96.56 km/h)67.85 mph (109.19 km/h)
65 mph (104.61 km/h)73.5 mph (118.29 km/h)
70 mph (112.65 km/h)79.16 mph (127.39 km/h)
75 mph (120.7 km/h)84.81 mph (136.49 km/h)
80 mph (128.75 km/h)90.47 mph (145.59 km/h)
85 mph (136.79 km/h)96.12 mph (154.69 km/h)
90 mph (144.84 km/h)101.77 mph (163.79 km/h)
95 mph (152.89 km/h)107.43 mph (172.89 km/h)
100 mph (160.93 km/h)113.08 mph (181.99 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
16221884202921182215228423602450257426982836294731473367354036503713394042584948
Better Fuel Economy Factory Ratios Increased Power

Most Popular 355/25-R21 Comparisons

To Top