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My suggestions for capsel diameters:
Wheel size=diameter mm=diameter inch
15"=415mm=16.338"
16"=440mm=17.322"
17"=471mm=18.543
18"=495mm=19.488"
19"=520mm=20.472"
20"=545mm
Those are the dimensions which I got when I was measuring aluminium rims at local rim dealer. Tolerances in those dimensions are about +-1.5mm
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