Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/70r16 vs 245/65r16 Tire Comparison Side By Side
  215/70-16 245/65-16 Difference
Diameter inches (mm) 27.85 (707.4) 28.54 (724.9) 0.69 (17.5) 2.5%
Width inches (mm) 8.46 (215) 9.65 (245) 1.18 (30) 14%
Circum. inches (mm) 87.49 (2222.36) 89.66 (2277.34) 2.16 (54.98) 2.5%
Sidewall Height inches (mm) 5.93 (150.5) 6.27 (159.25) 0.34 (8.75) 5.8%
Revolutions per mile (km) 724.16 (449.97) 706.68 (439.11) -17.48 (-10.86) -2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.49 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 (49.47 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 (90.7 km/h)
60 mph (96.56 km/h)61.48 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 (131.93 km/h)
85 mph (136.79 km/h)87.1 mph (140.18 km/h)
90 mph (144.84 km/h)92.23 mph (148.42 km/h)
95 mph (152.89 km/h)97.35 mph (156.67 km/h)
100 mph (160.93 km/h)102.47 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
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