Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
335/30r20 vs 335/25r20 Tire Comparison Side By Side
  335/30-20 335/25-20 Difference
Diameter inches (mm) 27.91 (709) 26.59 (675.5) -1.32 (-33.5) -4.7%
Width inches (mm) 13.19 (335) 13.19 (335) 0 (0) 0%
Circum. inches (mm) 87.69 (2227.39) 83.55 (2122.15) -4.14 (-105.24) -4.7%
Sidewall Height inches (mm) 3.96 (100.5) 3.3 (83.75) -0.66 (-16.75) -16.7%
Revolutions per mile (km) 722.52 (448.96) 758.36 (471.22) 35.83 (22.26) 5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.06 mph (30.67 km/h)
25 mph (40.23 km/h)23.82 mph (38.33 km/h)
30 mph (48.28 km/h)28.58 mph (46 km/h)
35 mph (56.33 km/h)33.35 mph (53.67 km/h)
40 mph (64.37 km/h)38.11 mph (61.33 km/h)
45 mph (72.42 km/h)42.87 mph (69 km/h)
50 mph (80.47 km/h)47.64 mph (76.67 km/h)
55 mph (88.51 km/h)52.4 mph (84.33 km/h)
60 mph (96.56 km/h)57.17 mph (92 km/h)
65 mph (104.61 km/h)61.93 mph (99.66 km/h)
70 mph (112.65 km/h)66.69 mph (107.33 km/h)
75 mph (120.7 km/h)71.46 mph (115 km/h)
80 mph (128.75 km/h)76.22 mph (122.66 km/h)
85 mph (136.79 km/h)80.98 mph (130.33 km/h)
90 mph (144.84 km/h)85.75 mph (138 km/h)
95 mph (152.89 km/h)90.51 mph (145.66 km/h)
100 mph (160.93 km/h)95.28 mph (153.33 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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