Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/50r16 vs 235/70r16 Tire Comparison Side By Side
  235/50-16 235/70-16 Difference
Diameter inches (mm) 25.25 (641.4) 28.95 (735.4) 3.7 (94) 14.7%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 79.33 (2015.02) 90.96 (2310.33) 11.63 (295.31) 14.7%
Sidewall Height inches (mm) 4.63 (117.5) 6.48 (164.5) 1.85 (47) 40%
Revolutions per mile (km) 798.67 (496.27) 696.59 (432.84) -102.09 (-63.43) -12.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.93 mph (36.9 km/h)
25 mph (40.23 km/h)28.66 mph (46.13 km/h)
30 mph (48.28 km/h)34.4 mph (55.36 km/h)
35 mph (56.33 km/h)40.13 mph (64.58 km/h)
40 mph (64.37 km/h)45.86 mph (73.81 km/h)
45 mph (72.42 km/h)51.59 mph (83.03 km/h)
50 mph (80.47 km/h)57.33 mph (92.26 km/h)
55 mph (88.51 km/h)63.06 mph (101.49 km/h)
60 mph (96.56 km/h)68.79 mph (110.71 km/h)
65 mph (104.61 km/h)74.53 mph (119.94 km/h)
70 mph (112.65 km/h)80.26 mph (129.16 km/h)
75 mph (120.7 km/h)85.99 mph (138.39 km/h)
80 mph (128.75 km/h)91.72 mph (147.62 km/h)
85 mph (136.79 km/h)97.46 mph (156.84 km/h)
90 mph (144.84 km/h)103.19 mph (166.07 km/h)
95 mph (152.89 km/h)108.92 mph (175.29 km/h)
100 mph (160.93 km/h)114.66 mph (184.52 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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