Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r18 vs 255/70r16 Tire Comparison Side By Side
  235/65-18 255/70-16 Difference
Diameter inches (mm) 30.03 (762.7) 30.06 (763.4) 0.03 (0.7) 0.1%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 94.33 (2396.09) 94.42 (2398.29) 0.09 (2.2) 0.1%
Sidewall Height inches (mm) 6.01 (152.75) 7.03 (178.5) 1.01 (25.75) 16.9%
Revolutions per mile (km) 671.65 (417.35) 671.04 (416.96) -0.62 (-0.38) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.02 mph (32.22 km/h)
25 mph (40.23 km/h)25.02 mph (40.27 km/h)
30 mph (48.28 km/h)30.03 mph (48.32 km/h)
35 mph (56.33 km/h)35.03 mph (56.38 km/h)
40 mph (64.37 km/h)40.04 mph (64.43 km/h)
45 mph (72.42 km/h)45.04 mph (72.49 km/h)
50 mph (80.47 km/h)50.05 mph (80.54 km/h)
55 mph (88.51 km/h)55.05 mph (88.6 km/h)
60 mph (96.56 km/h)60.06 mph (96.65 km/h)
65 mph (104.61 km/h)65.06 mph (104.7 km/h)
70 mph (112.65 km/h)70.06 mph (112.76 km/h)
75 mph (120.7 km/h)75.07 mph (120.81 km/h)
80 mph (128.75 km/h)80.07 mph (128.87 km/h)
85 mph (136.79 km/h)85.08 mph (136.92 km/h)
90 mph (144.84 km/h)90.08 mph (144.97 km/h)
95 mph (152.89 km/h)95.09 mph (153.03 km/h)
100 mph (160.93 km/h)100.09 mph (161.08 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
17081984213622312333240524852580271028412987310333143546372838443909414944845210
Better Fuel Economy Factory Ratios Increased Power

Most Popular 235/65-R18 Comparisons

To Top