The steer stop system is actually not the big issue, try turning the front front wheel until the fork is almost hitting the frame, and you will see in the center of head tube a small black thing bolted in the center, that is the steer stop system, I have broken 6 of those already until a new strengthened steer stop was given to me by Trek bow its all good, next thing to watch out is the seat Mast after around 10 months sidesways are happening at first i thought its the will that slipping a bit when cornering turns out the seat mast now have a left & right movement, but its carbon parts so another free replacement , my Madone is at Trek’s shop now for a month waiting for new Seat Mast. Dont get dissappointed its still a very nice bike, only thing is more moving parts such the isospeed means more maintenance parts,but since its lifetime warranty no need to spend.Trek already replaced twice my rear wheel each i broke a spoke and now the seat mast and the steer stop,