Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/70r16 vs 265/70r17 Tire Comparison Side By Side
  305/70-16 265/70-17 Difference
Diameter inches (mm) 32.81 (833.4) 31.61 (802.8) -1.2 (-30.6) -3.7%
Width inches (mm) 12.01 (305) 10.43 (265) -1.57 (-40) -13.1%
Circum. inches (mm) 103.08 (2618.2) 99.29 (2522.07) -3.78 (-96.13) -3.7%
Sidewall Height inches (mm) 8.41 (213.5) 7.3 (185.5) -1.1 (-28) -13.1%
Revolutions per mile (km) 614.67 (381.94) 638.1 (396.5) 23.43 (14.56) 3.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.27 mph (31.01 km/h)
25 mph (40.23 km/h)24.08 mph (38.76 km/h)
30 mph (48.28 km/h)28.9 mph (46.51 km/h)
35 mph (56.33 km/h)33.71 mph (54.26 km/h)
40 mph (64.37 km/h)38.53 mph (62.01 km/h)
45 mph (72.42 km/h)43.35 mph (69.76 km/h)
50 mph (80.47 km/h)48.16 mph (77.51 km/h)
55 mph (88.51 km/h)52.98 mph (85.26 km/h)
60 mph (96.56 km/h)57.8 mph (93.02 km/h)
65 mph (104.61 km/h)62.61 mph (100.77 km/h)
70 mph (112.65 km/h)67.43 mph (108.52 km/h)
75 mph (120.7 km/h)72.25 mph (116.27 km/h)
80 mph (128.75 km/h)77.06 mph (124.02 km/h)
85 mph (136.79 km/h)81.88 mph (131.77 km/h)
90 mph (144.84 km/h)86.7 mph (139.52 km/h)
95 mph (152.89 km/h)91.51 mph (147.27 km/h)
100 mph (160.93 km/h)96.33 mph (155.03 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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