Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r15 vs 215/75r15 Tire Comparison Side By Side
  235/75-15 215/75-15 Difference
Diameter inches (mm) 28.88 (733.5) 27.7 (703.5) -1.18 (-30) -4.1%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 90.72 (2304.36) 87.01 (2210.11) -3.71 (-94.25) -4.1%
Sidewall Height inches (mm) 6.94 (176.25) 6.35 (161.25) -0.59 (-15) -8.5%
Revolutions per mile (km) 698.39 (433.96) 728.17 (452.47) 29.78 (18.51) 4.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.18 mph (30.87 km/h)
25 mph (40.23 km/h)23.98 mph (38.59 km/h)
30 mph (48.28 km/h)28.77 mph (46.31 km/h)
35 mph (56.33 km/h)33.57 mph (54.02 km/h)
40 mph (64.37 km/h)38.36 mph (61.74 km/h)
45 mph (72.42 km/h)43.16 mph (69.46 km/h)
50 mph (80.47 km/h)47.96 mph (77.18 km/h)
55 mph (88.51 km/h)52.75 mph (84.89 km/h)
60 mph (96.56 km/h)57.55 mph (92.61 km/h)
65 mph (104.61 km/h)62.34 mph (100.33 km/h)
70 mph (112.65 km/h)67.14 mph (108.05 km/h)
75 mph (120.7 km/h)71.93 mph (115.76 km/h)
80 mph (128.75 km/h)76.73 mph (123.48 km/h)
85 mph (136.79 km/h)81.52 mph (131.2 km/h)
90 mph (144.84 km/h)86.32 mph (138.92 km/h)
95 mph (152.89 km/h)91.11 mph (146.63 km/h)
100 mph (160.93 km/h)95.91 mph (154.35 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
18532153231824212531261026972799294130833241336735963848404541714242450348655654
Better Fuel Economy Factory Ratios Increased Power

Most Popular 235/75-R15 Comparisons

To Top