Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/70r15 vs 255/60r15 Tire Comparison Side By Side
  245/70-15 255/60-15 Difference
Diameter inches (mm) 28.5 (724) 27.05 (687) -1.46 (-37) -5.1%
Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%
Circum. inches (mm) 89.55 (2274.51) 84.97 (2158.27) -4.58 (-116.24) -5.1%
Sidewall Height inches (mm) 6.75 (171.5) 6.02 (153) -0.73 (-18.5) -10.8%
Revolutions per mile (km) 707.56 (439.65) 745.66 (463.33) 38.11 (23.68) 5.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.98 mph (30.54 km/h)
25 mph (40.23 km/h)23.72 mph (38.18 km/h)
30 mph (48.28 km/h)28.47 mph (45.81 km/h)
35 mph (56.33 km/h)33.21 mph (53.45 km/h)
40 mph (64.37 km/h)37.96 mph (61.08 km/h)
45 mph (72.42 km/h)42.7 mph (68.72 km/h)
50 mph (80.47 km/h)47.44 mph (76.36 km/h)
55 mph (88.51 km/h)52.19 mph (83.99 km/h)
60 mph (96.56 km/h)56.93 mph (91.63 km/h)
65 mph (104.61 km/h)61.68 mph (99.26 km/h)
70 mph (112.65 km/h)66.42 mph (106.9 km/h)
75 mph (120.7 km/h)71.17 mph (114.53 km/h)
80 mph (128.75 km/h)75.91 mph (122.17 km/h)
85 mph (136.79 km/h)80.66 mph (129.8 km/h)
90 mph (144.84 km/h)85.4 mph (137.44 km/h)
95 mph (152.89 km/h)90.15 mph (145.07 km/h)
100 mph (160.93 km/h)94.89 mph (152.71 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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