Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/30r20 vs 255/30r20 Tire Comparison Side By Side
  265/30-20 255/30-20 Difference
Diameter inches (mm) 26.26 (667) 26.02 (661) -0.24 (-6) -0.9%
Width inches (mm) 10.43 (265) 10.04 (255) -0.39 (-10) -3.8%
Circum. inches (mm) 82.5 (2095.44) 81.76 (2076.59) -0.74 (-18.85) -0.9%
Sidewall Height inches (mm) 3.13 (79.5) 3.01 (76.5) -0.12 (-3) -3.8%
Revolutions per mile (km) 768.02 (477.23) 774.99 (481.56) 6.97 (4.33) 0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.82 mph (31.9 km/h)
25 mph (40.23 km/h)24.78 mph (39.87 km/h)
30 mph (48.28 km/h)29.73 mph (47.85 km/h)
35 mph (56.33 km/h)34.69 mph (55.82 km/h)
40 mph (64.37 km/h)39.64 mph (63.79 km/h)
45 mph (72.42 km/h)44.6 mph (71.77 km/h)
50 mph (80.47 km/h)49.55 mph (79.74 km/h)
55 mph (88.51 km/h)54.51 mph (87.72 km/h)
60 mph (96.56 km/h)59.46 mph (95.69 km/h)
65 mph (104.61 km/h)64.42 mph (103.67 km/h)
70 mph (112.65 km/h)69.37 mph (111.64 km/h)
75 mph (120.7 km/h)74.33 mph (119.62 km/h)
80 mph (128.75 km/h)79.28 mph (127.59 km/h)
85 mph (136.79 km/h)84.24 mph (135.56 km/h)
90 mph (144.84 km/h)89.19 mph (143.54 km/h)
95 mph (152.89 km/h)94.15 mph (151.51 km/h)
100 mph (160.93 km/h)99.1 mph (159.49 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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