Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/80r16 vs 215/75r17.5 Tire Comparison Side By Side
  235/80-16 215/75-17.5 Difference
Diameter inches (mm) 30.8 (782.4) 30.2 (767) -0.61 (-15.4) -2%
Width inches (mm) 9.25 (235) 8.46 (215) -0.79 (-20) -8.5%
Circum. inches (mm) 96.77 (2457.98) 94.87 (2409.6) -1.9 (-48.38) -2%
Sidewall Height inches (mm) 7.4 (188) 6.35 (161.25) -1.05 (-26.75) -14.2%
Revolutions per mile (km) 654.74 (406.84) 667.89 (415.01) 13.15 (8.17) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.61 mph (31.55 km/h)
25 mph (40.23 km/h)24.51 mph (39.44 km/h)
30 mph (48.28 km/h)29.41 mph (47.33 km/h)
35 mph (56.33 km/h)34.31 mph (55.22 km/h)
40 mph (64.37 km/h)39.21 mph (63.11 km/h)
45 mph (72.42 km/h)44.11 mph (71 km/h)
50 mph (80.47 km/h)49.02 mph (78.88 km/h)
55 mph (88.51 km/h)53.92 mph (86.77 km/h)
60 mph (96.56 km/h)58.82 mph (94.66 km/h)
65 mph (104.61 km/h)63.72 mph (102.55 km/h)
70 mph (112.65 km/h)68.62 mph (110.44 km/h)
75 mph (120.7 km/h)73.52 mph (118.33 km/h)
80 mph (128.75 km/h)78.43 mph (126.21 km/h)
85 mph (136.79 km/h)83.33 mph (134.1 km/h)
90 mph (144.84 km/h)88.23 mph (141.99 km/h)
95 mph (152.89 km/h)93.13 mph (149.88 km/h)
100 mph (160.93 km/h)98.03 mph (157.77 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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