Hi everyone.

This morning I rode to work and on my way back found that I couldn't shift to the largest chainring. I have a Shimano Ultegra triple FD, rings 52-42-30. I heard a sound that sounded like metal rubbing on metal.

I took a look and found that the FD couldn't get over the largest chainring, causing the outer chainring to rub against the front derailer. I don't know how this could have happened - I haven't had any accident to bump it out of place, and I just got this bike built up for me a couple of weeks ago, so the parts haven't had too much wear and tear from me.

I don't know how this happened (that the front derailer somehow is too low to shift to the largest chainring), or how to fix it. Can this be fixed simply? If I can take some pictures I will.