Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r15 vs 28/10.5r15 Tire Comparison Side By Side
  265/65-15 28/10.5-15 Difference
Diameter inches (mm) 28.56 (725.5) 28.03 (712.08) -0.53 (-13.42) -1.8%
Width inches (mm) 10.43 (265) 10.51 (267) 0.08 (2) 0.8%
Circum. inches (mm) 89.73 (2279.23) 88.07 (2237.07) -1.66 (-42.16) -1.8%
Sidewall Height inches (mm) 6.78 (172.25) 6.52 (165.54) -0.26 (-6.71) -3.9%
Revolutions per mile (km) 706.09 (438.74) 719.4 (447.01) 13.31 (8.27) 1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.63 mph (31.59 km/h)
25 mph (40.23 km/h)24.54 mph (39.49 km/h)
30 mph (48.28 km/h)29.45 mph (47.39 km/h)
35 mph (56.33 km/h)34.35 mph (55.29 km/h)
40 mph (64.37 km/h)39.26 mph (63.18 km/h)
45 mph (72.42 km/h)44.17 mph (71.08 km/h)
50 mph (80.47 km/h)49.08 mph (78.98 km/h)
55 mph (88.51 km/h)53.98 mph (86.88 km/h)
60 mph (96.56 km/h)58.89 mph (94.77 km/h)
65 mph (104.61 km/h)63.8 mph (102.67 km/h)
70 mph (112.65 km/h)68.71 mph (110.57 km/h)
75 mph (120.7 km/h)73.61 mph (118.47 km/h)
80 mph (128.75 km/h)78.52 mph (126.37 km/h)
85 mph (136.79 km/h)83.43 mph (134.26 km/h)
90 mph (144.84 km/h)88.34 mph (142.16 km/h)
95 mph (152.89 km/h)93.24 mph (150.06 km/h)
100 mph (160.93 km/h)98.15 mph (157.96 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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