Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r18 vs 235/65r16 Tire Comparison Side By Side
  255/55-18 235/65-16 Difference
Diameter inches (mm) 29.04 (737.7) 28.03 (711.9) -1.02 (-25.8) -3.5%
Width inches (mm) 10.04 (255) 9.25 (235) -0.79 (-20) -7.8%
Circum. inches (mm) 91.24 (2317.55) 88.05 (2236.5) -3.19 (-81.05) -3.5%
Sidewall Height inches (mm) 5.52 (140.25) 6.01 (152.75) 0.49 (12.5) 8.9%
Revolutions per mile (km) 694.42 (431.49) 719.58 (447.13) 25.17 (15.64) 3.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.3 mph (31.06 km/h)
25 mph (40.23 km/h)24.13 mph (38.83 km/h)
30 mph (48.28 km/h)28.95 mph (46.59 km/h)
35 mph (56.33 km/h)33.78 mph (54.36 km/h)
40 mph (64.37 km/h)38.6 mph (62.12 km/h)
45 mph (72.42 km/h)43.43 mph (69.89 km/h)
50 mph (80.47 km/h)48.25 mph (77.65 km/h)
55 mph (88.51 km/h)53.08 mph (85.42 km/h)
60 mph (96.56 km/h)57.9 mph (93.18 km/h)
65 mph (104.61 km/h)62.73 mph (100.95 km/h)
70 mph (112.65 km/h)67.55 mph (108.71 km/h)
75 mph (120.7 km/h)72.38 mph (116.48 km/h)
80 mph (128.75 km/h)77.2 mph (124.24 km/h)
85 mph (136.79 km/h)82.03 mph (132.01 km/h)
90 mph (144.84 km/h)86.85 mph (139.78 km/h)
95 mph (152.89 km/h)91.68 mph (147.54 km/h)
100 mph (160.93 km/h)96.5 mph (155.31 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
18312127229123922501257926652766290730473203332735533803399741224192444948085587
Better Fuel Economy Factory Ratios Increased Power

Most Popular 255/55-R18 Comparisons

To Top