Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/30r20 vs 295/30r20 Tire Comparison Side By Side
  305/30-20 295/30-20 Difference
Diameter inches (mm) 27.2 (691) 26.97 (685) -0.24 (-6) -0.9%
Width inches (mm) 12.01 (305) 11.61 (295) -0.39 (-10) -3.3%
Circum. inches (mm) 85.47 (2170.84) 84.72 (2151.99) -0.74 (-18.85) -0.9%
Sidewall Height inches (mm) 3.6 (91.5) 3.48 (88.5) -0.12 (-3) -3.3%
Revolutions per mile (km) 741.35 (460.65) 747.84 (464.69) 6.49 (4.03) 0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.83 mph (31.91 km/h)
25 mph (40.23 km/h)24.78 mph (39.88 km/h)
30 mph (48.28 km/h)29.74 mph (47.86 km/h)
35 mph (56.33 km/h)34.7 mph (55.84 km/h)
40 mph (64.37 km/h)39.65 mph (63.81 km/h)
45 mph (72.42 km/h)44.61 mph (71.79 km/h)
50 mph (80.47 km/h)49.57 mph (79.77 km/h)
55 mph (88.51 km/h)54.52 mph (87.75 km/h)
60 mph (96.56 km/h)59.48 mph (95.72 km/h)
65 mph (104.61 km/h)64.44 mph (103.7 km/h)
70 mph (112.65 km/h)69.39 mph (111.68 km/h)
75 mph (120.7 km/h)74.35 mph (119.65 km/h)
80 mph (128.75 km/h)79.31 mph (127.63 km/h)
85 mph (136.79 km/h)84.26 mph (135.61 km/h)
90 mph (144.84 km/h)89.22 mph (143.58 km/h)
95 mph (152.89 km/h)94.18 mph (151.56 km/h)
100 mph (160.93 km/h)99.13 mph (159.54 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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