Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r15 vs 255/60r17 Tire Comparison Side By Side
  235/75-15 255/60-17 Difference
Diameter inches (mm) 28.88 (733.5) 29.05 (737.8) 0.17 (4.3) 0.6%
Width inches (mm) 9.25 (235) 10.04 (255) 0.79 (20) 8.5%
Circum. inches (mm) 90.72 (2304.36) 91.25 (2317.87) 0.53 (13.51) 0.6%
Sidewall Height inches (mm) 6.94 (176.25) 6.02 (153) -0.92 (-23.25) -13.2%
Revolutions per mile (km) 698.39 (433.96) 694.32 (431.43) -4.07 (-2.53) -0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.12 mph (32.38 km/h)
25 mph (40.23 km/h)25.15 mph (40.47 km/h)
30 mph (48.28 km/h)30.18 mph (48.56 km/h)
35 mph (56.33 km/h)35.21 mph (56.66 km/h)
40 mph (64.37 km/h)40.23 mph (64.75 km/h)
45 mph (72.42 km/h)45.26 mph (72.85 km/h)
50 mph (80.47 km/h)50.29 mph (80.94 km/h)
55 mph (88.51 km/h)55.32 mph (89.03 km/h)
60 mph (96.56 km/h)60.35 mph (97.13 km/h)
65 mph (104.61 km/h)65.38 mph (105.22 km/h)
70 mph (112.65 km/h)70.41 mph (113.31 km/h)
75 mph (120.7 km/h)75.44 mph (121.41 km/h)
80 mph (128.75 km/h)80.47 mph (129.5 km/h)
85 mph (136.79 km/h)85.5 mph (137.6 km/h)
90 mph (144.84 km/h)90.53 mph (145.69 km/h)
95 mph (152.89 km/h)95.56 mph (153.78 km/h)
100 mph (160.93 km/h)100.59 mph (161.88 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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