Quote Originally Posted by Andezzar View Post
That is what common sense dictates, but is there an explicit rule for it? Do the rules actually spell out that all gloves/gauntlets come with fingers and do not look similar to Cycling gloves or other fingerless gloves?
The Player's Handbook says about gauntlets: "This metal glove protects your hands" (rather than parts of your hands). Also the pictures of gloves and gauntlets on page 71 of Magic Item Compendium show them both with full coverage.

But no, there's no explicit rule on this. Similarly, while there's an explanation in the rules of how you draw a sword to use it in combat, there's nothing which actually says you can't attack with it still in its scabbard. For standard concepts such as this you need to reference standard sources, such as Stone (A Glossary of the Construction, Decoration and Use of Arms and Armor: in All Countries and in All Times).