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Its the ideal size according to the late great Sheldon Brown.
Table towards the bottom of the page.
http://www.sheldonbrown.com/tire-sizing.html
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Its the ideal size according to the late great Sheldon Brown.
I'm assuming that @Kyslo means a 19mm external width, i.e. 13-15mm internal, in which case Sheldon thinks either don't do it or it's at the extreme end of the viable range. We've all learned a lot about tyre/rim interaction since Sheldon died, and I think most people would shift his table by at least one row to make wider rims the preferred choice.
I did this tweak some years ago:
right , what is the worst that can happen by putting a 28c tyre on a 19mm width rim ?