First of all, cyclers are just about the biggest users of PED's of any sport. There was a study done a short while ago (I don't have the time to look it up) where it was found the human body could not produce the endurance results necessary for these events naturally.
Now, to answer your question, i'm not familiar with the testosterone patches that seem to be the rage these days, but a fast-acting powerful test like suspension would definitelt give you a quick boost.