soak a washcloth in boiling water and wrap it around the tube the decal or sticker is on. the heat will losen the sticker. while the cloth is wraped around the tube, squeeze the cloth and twist it in an effort to make the decal slide or move. if it moves it's losing it's grip to the painted (or non-painted tube) and you can peel it off without doing any damage to paint or any finish the bike has.