Do older 105/600 FD's (6-7 speed) have sufficient throw for a triple crank?
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No, not really. If the throw happens to be OK you'll more than likely have problems with the chain dragging on the back of the cage.
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+1. Cage depth too short.
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Deore would work...
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It will work if the FD was meant to work with "normal" MTB cranks with 110/74bcd (usually a 46 to 48 tooth large chainwheel). the shifting might be a tad less than perfect with a large chainwheel of 52 or 53, but not enough of an issue to worry about. I would not bet on using an FD meant for one of those silly "modern" MTB cranksets that have a four arm spider and chainwheels that look like they're refugees from an RD jockey cage. I don't know they wouldn't work on a 52 tooth chainwheel, but I would be mildly surprised if they did.
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Triple added to Centurion Sport DLX
I read this thread a couple of days ago but could not reply at the time. I want to share my experience before the thread disappears into the abyss of the back pages. In the mid 90's I added a granny gear (28T) to my 1985 Centurion Sport DLX to assist with the hills on a cross Pennsylvania ride. Shimano Acera X components and a Shimano Exage Crank. While the shifting is not precise, and there can be chain rattle, it is functional. Practice and learning to feather the shifter have resulted in a relatively smooth ride. The Centurion continues to be my main mode of transport to work.
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