Disc brakes on bikes are not a problem. I have a Trek DS4 when I mounted my fender, I had no problem with it. If you check carefully, you will notice that there is provision for mounting fenders on your bike. If it is there, I do not think you will have any problems mounting your fender. If you are still unsure, I would suggest you ask to have it installed as soon as you get it. They will know what to do.