Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/65r15 vs 235/75r15 Tire Comparison Side By Side
  215/65-15 235/75-15 Difference
Diameter inches (mm) 26 (660.5) 28.88 (733.5) 2.87 (73) 11.1%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 81.69 (2075.02) 90.72 (2304.36) 9.03 (229.34) 11.1%
Sidewall Height inches (mm) 5.5 (139.75) 6.94 (176.25) 1.44 (36.5) 26.1%
Revolutions per mile (km) 775.58 (481.92) 698.39 (433.96) -77.19 (-47.96) -10%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.21 mph (35.74 km/h)
25 mph (40.23 km/h)27.76 mph (44.68 km/h)
30 mph (48.28 km/h)33.32 mph (53.62 km/h)
35 mph (56.33 km/h)38.87 mph (62.55 km/h)
40 mph (64.37 km/h)44.42 mph (71.49 km/h)
45 mph (72.42 km/h)49.97 mph (80.42 km/h)
50 mph (80.47 km/h)55.53 mph (89.36 km/h)
55 mph (88.51 km/h)61.08 mph (98.3 km/h)
60 mph (96.56 km/h)66.63 mph (107.23 km/h)
65 mph (104.61 km/h)72.18 mph (116.17 km/h)
70 mph (112.65 km/h)77.74 mph (125.11 km/h)
75 mph (120.7 km/h)83.29 mph (134.04 km/h)
80 mph (128.75 km/h)88.84 mph (142.98 km/h)
85 mph (136.79 km/h)94.39 mph (151.91 km/h)
90 mph (144.84 km/h)99.95 mph (160.85 km/h)
95 mph (152.89 km/h)105.5 mph (169.79 km/h)
100 mph (160.93 km/h)111.05 mph (178.72 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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