Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r23 vs 305/20r25 Tire Comparison Side By Side
  305/35-23 305/20-25 Difference
Diameter inches (mm) 31.41 (797.7) 29.8 (757) -1.6 (-40.7) -5.1%
Width inches (mm) 12.01 (305) 12.01 (305) 0 (0) 0%
Circum. inches (mm) 98.66 (2506.05) 93.63 (2378.19) -5.03 (-127.86) -5.1%
Sidewall Height inches (mm) 4.2 (106.75) 2.4 (61) -1.8 (-45.75) -42.9%
Revolutions per mile (km) 642.18 (399.03) 676.71 (420.49) 34.53 (21.45) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.98 mph (30.54 km/h)
25 mph (40.23 km/h)23.72 mph (38.18 km/h)
30 mph (48.28 km/h)28.47 mph (45.82 km/h)
35 mph (56.33 km/h)33.21 mph (53.45 km/h)
40 mph (64.37 km/h)37.96 mph (61.09 km/h)
45 mph (72.42 km/h)42.7 mph (68.73 km/h)
50 mph (80.47 km/h)47.45 mph (76.36 km/h)
55 mph (88.51 km/h)52.19 mph (84 km/h)
60 mph (96.56 km/h)56.94 mph (91.63 km/h)
65 mph (104.61 km/h)61.68 mph (99.27 km/h)
70 mph (112.65 km/h)66.43 mph (106.91 km/h)
75 mph (120.7 km/h)71.17 mph (114.54 km/h)
80 mph (128.75 km/h)75.92 mph (122.18 km/h)
85 mph (136.79 km/h)80.66 mph (129.82 km/h)
90 mph (144.84 km/h)85.41 mph (137.45 km/h)
95 mph (152.89 km/h)90.15 mph (145.09 km/h)
100 mph (160.93 km/h)94.9 mph (152.72 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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