Originally Posted by
chaadster
My suggestion would be to go with the smaller tube and let your tire take care of the foreign object intrusion issue.
I second that. In my 25 mm Continental GP5K and GP (which measure < 1" inflated on a 17 mm internal width wheel) I install Michelin 18-25c tubes:
Amazon.com : Michelin A1 Airstop 700x18-25c Road Bike Tube Bundle 52mm Smooth Presta - 4 PACK : Sports & Outdoors