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Old 02-19-04, 10:35 AM   #1
tlippy
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What is the difference between a double and a triple FD?

Can anyone tell me the exact difference between a 105 double and triple FD.
Thanks
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Old 02-20-04, 09:56 AM   #2
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Cage width and throw...................
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Old 02-20-04, 10:07 AM   #3
el Inglés
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a couple of euros .
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Old 02-20-04, 10:29 AM   #4
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Didn't answer this yeaterday?

Quote:
Originally Posted by tlippy
Can anyone tell me the exact difference between a 105 double and triple FD.
Thanks
I took the time yesterday to walk down to my basement where I have two Ultegra equipped bikes. One has a double front derailleur and one has a triple. At a glance I could see two obvious differences:

The triple derailleur has a much deeper blade on the inner derailleur cage. I assume this is to assist picking the chain up off of the granny ring. The triple cage also droops down farther behind the chainrings. I assume this is to prevent rubbing on the bottom of the derailleur cage if you happen to shift into a little/little gear combination.

I'm doubtful the throw is any different since they both use the same shifter so the cable pull is identical. I'm also doubtful about cage width since they both use the same chain and a too wide cage isn't going to shift well. The pricing thing is also a little goofy. I have a catalogue that shows a 105 triple derailleur costing more than a 105 double, but the Ultegra triple derailleur costs less than the Ultegra double.
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Old 02-20-04, 06:20 PM   #5
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Retro Grouch,

Mea Culpa on the erroneous info. Too early in the morning and I was thinking 8 spd. vs. 9 spd.
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Old 02-20-04, 10:04 PM   #6
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Admit it!

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Originally Posted by ncernitz
Retro Grouch,

Mea Culpa on the erroneous info. Too early in the morning and I was thinking 8 spd. vs. 9 spd.
I'll bet you were daydreaming about work insted of concentrating on bicycling stuff like you should. Besides, I thought all the coffee you northwesterners drink was supposed to get you wired earlier.
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