Originally Posted by Greenfieldja

Your 1987 trek 560 will undoubtedly have a 1" steerer on the fork and the head tube will be speced to accept a 1" headset such as the Dura-Ace 7410. So yes your frame/fork and this headset are compatible

The only question is weather you have enough steerer for the stack height of the dura-ace headset (37.6mm) This is the minimum lenth of fork steerer that is needed to properly install and adjust this headset. A longer steerer tube can be cut down or spacers added below the locknut to take up excess space (within reason) but if you do not have at least 37.6mm from the fork crown bearing seat to the top of the fork steerer then you are SOL.

You will still need the proper fork crown race...either one specifically for this headset model or one compatible unless the one currently on your fork is compatible.

-j