Join Date: Jul 2009
Bikes: 1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC
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I never had a bike with a long cage dderailleur, so I might be missing something, but I still don't understand why having a long cage on a derailleur will not require a bit more chain legnth, compared to a short caged derailleur
Looking at the chainline as a triangle with the freewhel cogs, front chainrings and the lowest RD jockey wheel representing the three corners, wouldn't the total legnth of the vectors in that triangle get longer if you pull away one of the corners form the others as you would be doing going from a short cage derailleur to a long cage?
I had a "tight" chainline situation with my Mavic 851 RD when I first installed it on my bike last year. It turned out that the cage was adjusted to be at the bottom of the adjusment slot on the RD. I pulled it up on it's slot and regained chain wrap capacity so my cage wasn't pulled/angled so much forward and assumed a more veritcal position at the middle cogs. Doen't that say that cage legnth does affect chain legnth??