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The second number is the ratio. You've got a tire 160 mm wide and if it's 160/60, then it's height is .60 of 160 mm or 160 x 0.6 or 160 x 60%. 180/55 is 180 mm wide and 180x.55 mm high.

What GTONut posted was diameter, not radius. Diameter is the width of the entire tire, so you're looking at a .3" change across it's total height from ground to top. That means a change of half that, or .15", in the actual height of the axle relative to the ground, assuming tread depth, inflation, yada yada are all constants (which they aren't, but what the heck). That's a bit under 4 mm ( 3.81 ).
 
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