Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/70r18 vs 275/65r18 Tire Comparison Side By Side
  235/70-18 275/65-18 Difference
Diameter inches (mm) 30.95 (786.2) 32.07 (814.7) 1.12 (28.5) 3.6%
Width inches (mm) 9.25 (235) 10.83 (275) 1.57 (40) 17%
Circum. inches (mm) 97.24 (2469.92) 100.77 (2559.46) 3.53 (89.54) 3.6%
Sidewall Height inches (mm) 6.48 (164.5) 7.04 (178.75) 0.56 (14.25) 8.7%
Revolutions per mile (km) 651.58 (404.87) 628.78 (390.71) -22.79 (-14.16) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.73 mph (33.35 km/h)
25 mph (40.23 km/h)25.91 mph (41.69 km/h)
30 mph (48.28 km/h)31.09 mph (50.03 km/h)
35 mph (56.33 km/h)36.27 mph (58.37 km/h)
40 mph (64.37 km/h)41.45 mph (66.71 km/h)
45 mph (72.42 km/h)46.63 mph (75.05 km/h)
50 mph (80.47 km/h)51.81 mph (83.38 km/h)
55 mph (88.51 km/h)56.99 mph (91.72 km/h)
60 mph (96.56 km/h)62.18 mph (100.06 km/h)
65 mph (104.61 km/h)67.36 mph (108.4 km/h)
70 mph (112.65 km/h)72.54 mph (116.74 km/h)
75 mph (120.7 km/h)77.72 mph (125.08 km/h)
80 mph (128.75 km/h)82.9 mph (133.41 km/h)
85 mph (136.79 km/h)88.08 mph (141.75 km/h)
90 mph (144.84 km/h)93.26 mph (150.09 km/h)
95 mph (152.89 km/h)98.44 mph (158.43 km/h)
100 mph (160.93 km/h)103.63 mph (166.77 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
16001859200220902186225423292417254026622799290731053323349336023663388842014882
Better Fuel Economy Factory Ratios Increased Power

Most Popular 235/70-R18 Comparisons

To Top