Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/70r16 vs 215/60r16 Tire Comparison Side By Side
  235/70-16 215/60-16 Difference
Diameter inches (mm) 28.95 (735.4) 26.16 (664.4) -2.8 (-71) -9.7%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 90.96 (2310.33) 82.18 (2087.27) -8.78 (-223.05) -9.7%
Sidewall Height inches (mm) 6.48 (164.5) 5.08 (129) -1.4 (-35.5) -21.6%
Revolutions per mile (km) 696.59 (432.84) 771.03 (479.09) 74.44 (46.25) 10.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.07 mph (29.08 km/h)
25 mph (40.23 km/h)22.59 mph (36.35 km/h)
30 mph (48.28 km/h)27.1 mph (43.62 km/h)
35 mph (56.33 km/h)31.62 mph (50.89 km/h)
40 mph (64.37 km/h)36.14 mph (58.16 km/h)
45 mph (72.42 km/h)40.66 mph (65.43 km/h)
50 mph (80.47 km/h)45.17 mph (72.7 km/h)
55 mph (88.51 km/h)49.69 mph (79.97 km/h)
60 mph (96.56 km/h)54.21 mph (87.24 km/h)
65 mph (104.61 km/h)58.72 mph (94.51 km/h)
70 mph (112.65 km/h)63.24 mph (101.78 km/h)
75 mph (120.7 km/h)67.76 mph (109.05 km/h)
80 mph (128.75 km/h)72.28 mph (116.32 km/h)
85 mph (136.79 km/h)76.79 mph (123.59 km/h)
90 mph (144.84 km/h)81.31 mph (130.86 km/h)
95 mph (152.89 km/h)85.83 mph (138.13 km/h)
100 mph (160.93 km/h)90.35 mph (145.4 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
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