Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r15 vs 215/75r15 Tire Comparison Side By Side
  235/65-15 215/75-15 Difference
Diameter inches (mm) 27.03 (686.5) 27.7 (703.5) 0.67 (17) 2.5%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 84.91 (2156.7) 87.01 (2210.11) 2.1 (53.41) 2.5%
Sidewall Height inches (mm) 6.01 (152.75) 6.35 (161.25) 0.33 (8.5) 5.6%
Revolutions per mile (km) 746.21 (463.67) 728.17 (452.47) -18.03 (-11.2) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.5 mph (32.98 km/h)
25 mph (40.23 km/h)25.62 mph (41.23 km/h)
30 mph (48.28 km/h)30.74 mph (49.48 km/h)
35 mph (56.33 km/h)35.87 mph (57.72 km/h)
40 mph (64.37 km/h)40.99 mph (65.97 km/h)
45 mph (72.42 km/h)46.11 mph (74.21 km/h)
50 mph (80.47 km/h)51.24 mph (82.46 km/h)
55 mph (88.51 km/h)56.36 mph (90.71 km/h)
60 mph (96.56 km/h)61.49 mph (98.95 km/h)
65 mph (104.61 km/h)66.61 mph (107.2 km/h)
70 mph (112.65 km/h)71.73 mph (115.44 km/h)
75 mph (120.7 km/h)76.86 mph (123.69 km/h)
80 mph (128.75 km/h)81.98 mph (131.94 km/h)
85 mph (136.79 km/h)87.1 mph (140.18 km/h)
90 mph (144.84 km/h)92.23 mph (148.43 km/h)
95 mph (152.89 km/h)97.35 mph (156.67 km/h)
100 mph (160.93 km/h)102.48 mph (164.92 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 235/65-R15 Comparisons

To Top