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 325/30r23 Tire Comparison Side By Side
  305/35-23 325/30-23 Difference
Diameter inches (mm) 31.41 (797.7) 30.68 (779.2) -0.73 (-18.5) -2.3%
Width inches (mm) 12.01 (305) 12.8 (325) 0.79 (20) 6.6%
Circum. inches (mm) 98.66 (2506.05) 96.38 (2447.93) -2.29 (-58.12) -2.3%
Sidewall Height inches (mm) 4.2 (106.75) 3.84 (97.5) -0.36 (-9.25) -8.7%
Revolutions per mile (km) 642.18 (399.03) 657.43 (408.51) 15.25 (9.47) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.54 mph (31.44 km/h)
25 mph (40.23 km/h)24.42 mph (39.3 km/h)
30 mph (48.28 km/h)29.3 mph (47.16 km/h)
35 mph (56.33 km/h)34.19 mph (55.02 km/h)
40 mph (64.37 km/h)39.07 mph (62.88 km/h)
45 mph (72.42 km/h)43.96 mph (70.74 km/h)
50 mph (80.47 km/h)48.84 mph (78.6 km/h)
55 mph (88.51 km/h)53.72 mph (86.46 km/h)
60 mph (96.56 km/h)58.61 mph (94.32 km/h)
65 mph (104.61 km/h)63.49 mph (102.18 km/h)
70 mph (112.65 km/h)68.38 mph (110.04 km/h)
75 mph (120.7 km/h)73.26 mph (117.9 km/h)
80 mph (128.75 km/h)78.14 mph (125.76 km/h)
85 mph (136.79 km/h)83.03 mph (133.62 km/h)
90 mph (144.84 km/h)87.91 mph (141.48 km/h)
95 mph (152.89 km/h)92.8 mph (149.34 km/h)
100 mph (160.93 km/h)97.68 mph (157.2 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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