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 265/60r18 Tire Comparison Side By Side
  255/55-18 265/60-18 Difference
Diameter inches (mm) 29.04 (737.7) 30.52 (775.2) 1.48 (37.5) 5.1%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 91.24 (2317.55) 95.88 (2435.36) 4.64 (117.81) 5.1%
Sidewall Height inches (mm) 5.52 (140.25) 6.26 (159) 0.74 (18.75) 13.4%
Revolutions per mile (km) 694.42 (431.49) 660.82 (410.62) -33.59 (-20.87) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.02 mph (33.82 km/h)
25 mph (40.23 km/h)26.27 mph (42.28 km/h)
30 mph (48.28 km/h)31.53 mph (50.73 km/h)
35 mph (56.33 km/h)36.78 mph (59.19 km/h)
40 mph (64.37 km/h)42.03 mph (67.65 km/h)
45 mph (72.42 km/h)47.29 mph (76.1 km/h)
50 mph (80.47 km/h)52.54 mph (84.56 km/h)
55 mph (88.51 km/h)57.8 mph (93.01 km/h)
60 mph (96.56 km/h)63.05 mph (101.47 km/h)
65 mph (104.61 km/h)68.3 mph (109.93 km/h)
70 mph (112.65 km/h)73.56 mph (118.38 km/h)
75 mph (120.7 km/h)78.81 mph (126.84 km/h)
80 mph (128.75 km/h)84.07 mph (135.29 km/h)
85 mph (136.79 km/h)89.32 mph (143.75 km/h)
90 mph (144.84 km/h)94.58 mph (152.2 km/h)
95 mph (152.89 km/h)99.83 mph (160.66 km/h)
100 mph (160.93 km/h)105.08 mph (169.12 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
16821954210421972297236924472540266927982941305632633492367137863850408644155131
Better Fuel Economy Factory Ratios Increased Power

Most Popular 255/55-R18 Comparisons

To Top