nothing wrong with a demo 7 and an 888. the demo7 has a hair uder 8" in the rear if you remove the chip and it has a stronger head tube then the demo 8. Now for 2010 Spec. has upgraded the demo 8 to a 1.5 head tube also, so essentially they are even more similar now.Demo seven with an 888????? I do belive there is a reason SPeccy told us not to put DC's on those