Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/60r15 vs 275/60r15 Tire Comparison Side By Side
  215/60-15 275/60-15 Difference
Diameter inches (mm) 25.16 (639) 27.99 (711) 2.83 (72) 11.3%
Width inches (mm) 8.46 (215) 10.83 (275) 2.36 (60) 27.9%
Circum. inches (mm) 79.03 (2007.48) 87.94 (2233.67) 8.91 (226.19) 11.3%
Sidewall Height inches (mm) 5.08 (129) 6.5 (165) 1.42 (36) 27.9%
Revolutions per mile (km) 801.67 (498.14) 720.49 (447.69) -81.18 (-50.44) -10.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.25 mph (35.81 km/h)
25 mph (40.23 km/h)27.82 mph (44.77 km/h)
30 mph (48.28 km/h)33.38 mph (53.72 km/h)
35 mph (56.33 km/h)38.94 mph (62.67 km/h)
40 mph (64.37 km/h)44.51 mph (71.63 km/h)
45 mph (72.42 km/h)50.07 mph (80.58 km/h)
50 mph (80.47 km/h)55.63 mph (89.53 km/h)
55 mph (88.51 km/h)61.2 mph (98.49 km/h)
60 mph (96.56 km/h)66.76 mph (107.44 km/h)
65 mph (104.61 km/h)72.32 mph (116.39 km/h)
70 mph (112.65 km/h)77.89 mph (125.35 km/h)
75 mph (120.7 km/h)83.45 mph (134.3 km/h)
80 mph (128.75 km/h)89.01 mph (143.25 km/h)
85 mph (136.79 km/h)94.58 mph (152.21 km/h)
90 mph (144.84 km/h)100.14 mph (161.16 km/h)
95 mph (152.89 km/h)105.7 mph (170.11 km/h)
100 mph (160.93 km/h)111.27 mph (179.07 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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