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 255/70r16 Tire Comparison Side By Side
  235/70-16 255/70-16 Difference
Diameter inches (mm) 28.95 (735.4) 30.06 (763.4) 1.1 (28) 3.8%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 90.96 (2310.33) 94.42 (2398.29) 3.46 (87.96) 3.8%
Sidewall Height inches (mm) 6.48 (164.5) 7.03 (178.5) 0.55 (14) 8.5%
Revolutions per mile (km) 696.59 (432.84) 671.04 (416.96) -25.55 (-15.88) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.41 km/h)
25 mph (40.23 km/h)25.95 mph (41.77 km/h)
30 mph (48.28 km/h)31.14 mph (50.12 km/h)
35 mph (56.33 km/h)36.33 mph (58.47 km/h)
40 mph (64.37 km/h)41.52 mph (66.82 km/h)
45 mph (72.42 km/h)46.71 mph (75.18 km/h)
50 mph (80.47 km/h)51.9 mph (83.53 km/h)
55 mph (88.51 km/h)57.09 mph (91.88 km/h)
60 mph (96.56 km/h)62.28 mph (100.24 km/h)
65 mph (104.61 km/h)67.47 mph (108.59 km/h)
70 mph (112.65 km/h)72.67 mph (116.94 km/h)
75 mph (120.7 km/h)77.86 mph (125.3 km/h)
80 mph (128.75 km/h)83.05 mph (133.65 km/h)
85 mph (136.79 km/h)88.24 mph (142 km/h)
90 mph (144.84 km/h)93.43 mph (150.36 km/h)
95 mph (152.89 km/h)98.62 mph (158.71 km/h)
100 mph (160.93 km/h)103.81 mph (167.06 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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