The 285's would be slightly (0.25mm) taller than the 305's. To get the tickness of the tyre from the rim, just multiply the first figure eg 305 by the second figure 75 (75%). So the height of the rubber is 75% of 305mm or 213.5mm. Double this figure and add it to the size of your rims (16 inches) and you will get the overall height of the tyre.
Ian
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