Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/85r14 vs 27/9r14 Tire Comparison Side By Side
  215/85-14 27/9-14 Difference
Diameter inches (mm) 28.39 (721.1) 26.98 (685.36) -1.41 (-35.74) -5%
Width inches (mm) 8.46 (215) 9.02 (229) 0.55 (14) 6.5%
Circum. inches (mm) 89.19 (2265.4) 84.77 (2153.12) -4.42 (-112.28) -5%
Sidewall Height inches (mm) 7.19 (182.75) 6.49 (164.88) -0.7 (-17.87) -9.8%
Revolutions per mile (km) 710.4 (441.42) 747.45 (464.44) 37.05 (23.02) 5.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.01 mph (30.59 km/h)
25 mph (40.23 km/h)23.76 mph (38.24 km/h)
30 mph (48.28 km/h)28.51 mph (45.89 km/h)
35 mph (56.33 km/h)33.27 mph (53.54 km/h)
40 mph (64.37 km/h)38.02 mph (61.18 km/h)
45 mph (72.42 km/h)42.77 mph (68.83 km/h)
50 mph (80.47 km/h)47.52 mph (76.48 km/h)
55 mph (88.51 km/h)52.27 mph (84.13 km/h)
60 mph (96.56 km/h)57.03 mph (91.77 km/h)
65 mph (104.61 km/h)61.78 mph (99.42 km/h)
70 mph (112.65 km/h)66.53 mph (107.07 km/h)
75 mph (120.7 km/h)71.28 mph (114.72 km/h)
80 mph (128.75 km/h)76.03 mph (122.37 km/h)
85 mph (136.79 km/h)80.79 mph (130.01 km/h)
90 mph (144.84 km/h)85.54 mph (137.66 km/h)
95 mph (152.89 km/h)90.29 mph (145.31 km/h)
100 mph (160.93 km/h)95.04 mph (152.96 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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