I am a triple fan, I am not a racer but enjoy riding over hill and dale, sometimes with a load and hate running out of gears. Of course we aren't even discussing gear ratio here. If you feel the double doesn't have the correct ratio, do ask for a different gearing. perhaps it can be done with another double but if not put on a triple - I am not familiar with the bike so just a note switching to a triple may involve a new bottom bracket, etc. Most important, if the gearing doesn't work, you aren't going to enjoy riding and that isn't an option