Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/35r19 vs 345/30r19 Tire Comparison Side By Side
  305/35-19 345/30-19 Difference
Diameter inches (mm) 27.41 (696.1) 27.15 (689.6) -0.26 (-6.5) -0.9%
Width inches (mm) 12.01 (305) 13.58 (345) 1.57 (40) 13.1%
Circum. inches (mm) 86.1 (2186.86) 85.29 (2166.44) -0.8 (-20.42) -0.9%
Sidewall Height inches (mm) 4.2 (106.75) 4.07 (103.5) -0.13 (-3.25) -3%
Revolutions per mile (km) 735.91 (457.28) 742.85 (461.59) 6.94 (4.31) 0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.81 mph (31.89 km/h)
25 mph (40.23 km/h)24.77 mph (39.86 km/h)
30 mph (48.28 km/h)29.72 mph (47.83 km/h)
35 mph (56.33 km/h)34.67 mph (55.8 km/h)
40 mph (64.37 km/h)39.63 mph (63.77 km/h)
45 mph (72.42 km/h)44.58 mph (71.74 km/h)
50 mph (80.47 km/h)49.53 mph (79.72 km/h)
55 mph (88.51 km/h)54.49 mph (87.69 km/h)
60 mph (96.56 km/h)59.44 mph (95.66 km/h)
65 mph (104.61 km/h)64.39 mph (103.63 km/h)
70 mph (112.65 km/h)69.35 mph (111.6 km/h)
75 mph (120.7 km/h)74.3 mph (119.57 km/h)
80 mph (128.75 km/h)79.25 mph (127.55 km/h)
85 mph (136.79 km/h)84.21 mph (135.52 km/h)
90 mph (144.84 km/h)89.16 mph (143.49 km/h)
95 mph (152.89 km/h)94.11 mph (151.46 km/h)
100 mph (160.93 km/h)99.07 mph (159.43 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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