Quote Originally Posted by OakLeaf View Post
FWIW, since you mentioned an 11-25, that's what I have in back too. I'd wanted to put on Ultegra when I replaced it, but they didn't have that gear combination in Ultegra, so I stayed with 105. When I was looking at the Ultegra parts diagram the other day, it says not to use the Ultegra cassette with a triple crank. Maybe that's the problem you were having?
What, why? I have an Ultegra triple and I've not only never dropped a chain, but I often use all 10 gears in the middle ring. Oh wait...I only have 9 gears. Maybe that's the difference? I forgot that mine's a couple of years old.