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If you have a set of rims running schraeder valves can i use presta tubes instead?
Yes you can get some rubber grommets for the holes, available online I think I got mine from Edinburgh Bike Coop
[url= https://www.google.co.uk/search?q=presta+stem+saver&hl=en&client=safari&tbo=u&source=univ&tbm=shop&sa=X&ei=YKufUL7JDael0QWgjIHwDA&ved=0CEIQrQQ&biw=480&bih=269 ]Quick google search...[/url]
Quite a lot of presta tyres come with a step-down valve nut that does the same job, too.
You don't have to use the gromit things. I have run many a wheel with presta valves in a schrader holes.
Quick fix is to put a few wraps of plumbers or sparky tape round the top of the valve if you are particularly worried about it.
I don't bother with the grommets either, the valve stem isn't going anywhere