Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
225/70r19.5 vs 265/70r17 Tire Comparison Side By Side
  225/70-19.5 265/70-17 Difference
Diameter inches (mm) 31.9 (810.3) 31.61 (802.8) -0.3 (-7.5) -0.9%
Width inches (mm) 8.86 (225) 10.43 (265) 1.57 (40) 17.8%
Circum. inches (mm) 100.22 (2545.63) 99.29 (2522.07) -0.93 (-23.56) -0.9%
Sidewall Height inches (mm) 6.2 (157.5) 7.3 (185.5) 1.1 (28) 17.8%
Revolutions per mile (km) 632.2 (392.83) 638.1 (396.5) 5.91 (3.67) 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)34.68 mph (55.81 km/h)
40 mph (64.37 km/h)39.63 mph (63.78 km/h)
45 mph (72.42 km/h)44.58 mph (71.75 km/h)
50 mph (80.47 km/h)49.54 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 (95.67 km/h)
65 mph (104.61 km/h)64.4 mph (103.64 km/h)
70 mph (112.65 km/h)69.35 mph (111.61 km/h)
75 mph (120.7 km/h)74.31 mph (119.58 km/h)
80 mph (128.75 km/h)79.26 mph (127.56 km/h)
85 mph (136.79 km/h)84.21 mph (135.53 km/h)
90 mph (144.84 km/h)89.17 mph (143.5 km/h)
95 mph (152.89 km/h)94.12 mph (151.47 km/h)
100 mph (160.93 km/h)99.07 mph (159.45 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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