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Do older 105/600 FD's (6-7 speed) have sufficient throw for a triple crank?

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Do older 105/600 FD's (6-7 speed) have sufficient throw for a triple crank?

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Old 06-23-11, 10:25 PM
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Do older 105/600 FD's (6-7 speed) have sufficient throw for a triple crank?

Thanks
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Old 06-24-11, 12:49 AM
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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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Old 06-24-11, 06:46 AM
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+1 If it works, you're just lucky.
Not designed for the differences in ring diameters, or the throw distance from inside to outside.
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Old 06-24-11, 02:40 PM
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+1. Cage depth too short.
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Old 06-24-11, 05:36 PM
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OK, what about using an MTB FD? Too much curve?
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Old 06-24-11, 05:41 PM
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Deore would work...
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Old 06-24-11, 07:05 PM
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Originally Posted by RFC
OK, what about using an MTB FD? Too much curve?
Depends on the crank. I've done it, lots of times.
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Old 06-24-11, 07:38 PM
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Originally Posted by RFC
OK, what about using an MTB FD? Too much curve?
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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Old 06-24-11, 07:57 PM
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Originally Posted by bigbossman
Depends on the crank. I've done it, lots of times.
I knew there was a crank addiction in there somewhere....
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Old 06-28-11, 08:40 AM
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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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