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Higher end groupset = easier fd spring/movement ?

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Higher end groupset = easier fd spring/movement ?

Old 07-06-13, 05:55 PM
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lennyk
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Higher end groupset = easier fd spring/movement ?

Is it a given that the lower end group sets always had stiffer movement on the front derailleur ?
I've owned tiagra, 105 and ultegra as well as used duraace on other persons bikes and this seems to be the case.
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Old 07-06-13, 11:16 PM
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No, I wouldn't consider that a given. That's something that would have to be taken case by case.
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Old 07-07-13, 12:34 AM
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There's likely to be a general trend like that for Shimano and maybe Campy throughout the 90s and perhaps further, maybe with some trickle-down as the years went on, since I recall seeing 'lighter shift effort' being touted in the marketing bumf now and then over the years. But how far could it go before the derailer can't pull the chain off the big ring?

I like a strong return spring in a derailer. It gives the cable system a higher friction threshold.

Besides, most decent shifters have their own counterspring, to equalise the effort going each way.
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Old 07-07-13, 12:37 AM
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better installation attention to detail with what you have been tried?
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Old 07-07-13, 10:30 AM
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It's possible of course but it would not take a large change in shifter pivot geometry to make for a lighter pull, so just as well could be the shifters.
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Old 07-07-13, 10:43 AM
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Originally Posted by cny-bikeman View Post
It's possible of course but it would not take a large change in shifter pivot geometry to make for a lighter pull, so just as well could be the shifters.
This wouldn't apply to index FDs since they need the geometry locked in to match at both ends. Since most makers have plug compatibility across the model range of any series, the geometry has to be same.

There has been a trend to ever lighter action especially if you go back a number of years. This is done not with geometry, but simply the use of lighter springs, but I don't know if any maker uses two different strength springs in their offerings of the same type during the same year.
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Old 07-07-13, 11:46 AM
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Originally Posted by FBinNY View Post
This wouldn't apply to index FDs since they need the geometry locked in to match at both ends. Since most makers have plug compatibility across the model range of any series, the geometry has to be same.

There has been a trend to ever lighter action especially if you go back a number of years. This is done not with geometry, but simply the use of lighter springs, but I don't know if any maker uses two different strength springs in their offerings of the same type during the same year.
Doesn't the pull depend on distance between lever stops, rather than the mechanical advantage of the lever?
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Old 07-07-13, 11:47 AM
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Originally Posted by FBinNY View Post
This wouldn't apply to index FDs since they need the geometry locked in to match at both ends. Since most makers have plug compatibility across the model range of any series, the geometry has to be same.
Doesn't the pull depend on distance between lever stops, rather than the mechanical advantage of the lever?
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Old 07-07-13, 11:56 AM
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I guess you're serious since you posted this twice.

Yes, the issue is the amount of cable pulled per click. This could be achieved with a smaller drum and clicks farther apart which would improve leverage. Likewise a larger lever is an easy alternative, a la large levers Huret used on some of their shifters back in the Bronze Age.

But practical considerations come into play, and makers need to manage the are of lever travel to a workable range, plus are constrained in drum size since it's already under the correct engineering diameter for a cable pulley. So in the end the working range of the various FD levers is pretty similar.

Also, if a maker were to fool with leverage and response, it's the high end levers which would have less leverage so less travel were needed to affect a shift. Campagnolo did this in their road line. All levers were the same but the Mirage FDs had a different response ratio and needed a longer lever stroke to shift.
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