Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/70r16 vs 225/65r16 Tire Comparison Side By Side
  235/70-16 225/65-16 Difference
Diameter inches (mm) 28.95 (735.4) 27.52 (698.9) -1.44 (-36.5) -5%
Width inches (mm) 9.25 (235) 8.86 (225) -0.39 (-10) -4.3%
Circum. inches (mm) 90.96 (2310.33) 86.44 (2195.66) -4.51 (-114.67) -5%
Sidewall Height inches (mm) 6.48 (164.5) 5.76 (146.25) -0.72 (-18.25) -11.1%
Revolutions per mile (km) 696.59 (432.84) 732.97 (455.44) 36.38 (22.6) 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 (45.88 km/h)
35 mph (56.33 km/h)33.26 mph (53.53 km/h)
40 mph (64.37 km/h)38.01 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 (76.47 km/h)
55 mph (88.51 km/h)52.27 mph (84.12 km/h)
60 mph (96.56 km/h)57.02 mph (91.77 km/h)
65 mph (104.61 km/h)61.77 mph (99.42 km/h)
70 mph (112.65 km/h)66.53 mph (107.06 km/h)
75 mph (120.7 km/h)71.28 mph (114.71 km/h)
80 mph (128.75 km/h)76.03 mph (122.36 km/h)
85 mph (136.79 km/h)80.78 mph (130.01 km/h)
90 mph (144.84 km/h)85.53 mph (137.65 km/h)
95 mph (152.89 km/h)90.28 mph (145.3 km/h)
100 mph (160.93 km/h)95.04 mph (152.95 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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