Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
35/12.5r17 vs 255/85r17 Tire Comparison Side By Side
  35/12.5-17 255/85-17 Difference
Diameter inches (mm) 35.03 (889.72) 34.07 (865.3) -0.96 (-24.42) -2.7%
Width inches (mm) 12.52 (318) 10.04 (255) -2.48 (-63) -19.8%
Circum. inches (mm) 110.04 (2795.14) 107.02 (2718.42) -3.02 (-76.72) -2.7%
Sidewall Height inches (mm) 9.01 (228.96) 8.53 (216.75) -0.48 (-12.21) -5.3%
Revolutions per mile (km) 575.77 (357.76) 592.01 (367.86) 16.25 (10.1) 2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.45 mph (31.3 km/h)
25 mph (40.23 km/h)24.31 mph (39.13 km/h)
30 mph (48.28 km/h)29.18 mph (46.96 km/h)
35 mph (56.33 km/h)34.04 mph (54.78 km/h)
40 mph (64.37 km/h)38.9 mph (62.61 km/h)
45 mph (72.42 km/h)43.76 mph (70.43 km/h)
50 mph (80.47 km/h)48.63 mph (78.26 km/h)
55 mph (88.51 km/h)53.49 mph (86.08 km/h)
60 mph (96.56 km/h)58.35 mph (93.91 km/h)
65 mph (104.61 km/h)63.22 mph (101.74 km/h)
70 mph (112.65 km/h)68.08 mph (109.56 km/h)
75 mph (120.7 km/h)72.94 mph (117.39 km/h)
80 mph (128.75 km/h)77.8 mph (125.21 km/h)
85 mph (136.79 km/h)82.67 mph (133.04 km/h)
90 mph (144.84 km/h)87.53 mph (140.87 km/h)
95 mph (152.89 km/h)92.39 mph (148.69 km/h)
100 mph (160.93 km/h)97.26 mph (156.52 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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