Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r15 vs 215/60r15 Tire Comparison Side By Side
  215/70-15 215/60-15 Difference
Diameter inches (mm) 26.85 (682) 25.16 (639) -1.69 (-43) -6.3%
Width inches (mm) 8.46 (215) 8.46 (215) 0 (0) 0%
Circum. inches (mm) 84.35 (2142.57) 79.03 (2007.48) -5.32 (-135.09) -6.3%
Sidewall Height inches (mm) 5.93 (150.5) 5.08 (129) -0.85 (-21.5) -14.3%
Revolutions per mile (km) 751.13 (466.73) 801.67 (498.14) 50.55 (31.41) 6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.74 mph (30.16 km/h)
25 mph (40.23 km/h)23.42 mph (37.7 km/h)
30 mph (48.28 km/h)28.11 mph (45.24 km/h)
35 mph (56.33 km/h)32.79 mph (52.78 km/h)
40 mph (64.37 km/h)37.48 mph (60.32 km/h)
45 mph (72.42 km/h)42.16 mph (67.85 km/h)
50 mph (80.47 km/h)46.85 mph (75.39 km/h)
55 mph (88.51 km/h)51.53 mph (82.93 km/h)
60 mph (96.56 km/h)56.22 mph (90.47 km/h)
65 mph (104.61 km/h)60.9 mph (98.01 km/h)
70 mph (112.65 km/h)65.59 mph (105.55 km/h)
75 mph (120.7 km/h)70.27 mph (113.09 km/h)
80 mph (128.75 km/h)74.96 mph (120.63 km/h)
85 mph (136.79 km/h)79.64 mph (128.17 km/h)
90 mph (144.84 km/h)84.33 mph (135.71 km/h)
95 mph (152.89 km/h)89.01 mph (143.25 km/h)
100 mph (160.93 km/h)93.7 mph (150.79 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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