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@BillB
I'm currently running on a set of 36spoked Mavic A319 touring rims, because I'm a fat bastid and wanted good strong wheels (they were quite reasonably priced too). I've got Swalbe marathons on there in 28X700c which suit me very well. I've been looking at track frames though and 28s will be tight or possibly not even fit, so I understand tire sizing in as much as:
My rims are 19mm wide where the tyre bead sits
I've read somewhere (probably sheldon's site) that tyres should be 1.4-2.0 X rim width
so that puts me on 26.6mm minimum,
Do you think I could get away with a 25mm wide tyre, has anyone tried real skinny rubber on such a wide rim?
EDIT:
this is the dimentions off Mavic's site
ETRTO compatible size: 622 x 19c
Recommended nipple length: 12 mm
Recommended rim tape: 622 x 20 x 0.6
Recommended tire widths: 28 to 47 mm
I know 28 is the smallest reccommended but would a slightly smaller tyre still be safe?