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Old 08-15-06, 08:28 PM   #1
dougfixit@hotma
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sti/rapidrise/flightdeck

OKay here is a question for you






I am building a new touring bike. Am going to use road shifters with mtb gears and derailers. Now 2 questions really, rapid rise or not? If rapid rise will this mess up the intended use of a flightdeck computer.Otherwise will the computer be able to be programed backwards or will everything be bassakwards. That is fouling up gears and cadence readings ? any answers out there. rapid rise sounds cool when cranking up a hill with a load. Especially when you're an old fart. doug
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Old 08-15-06, 08:30 PM   #2
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The Flightdeck has a specific setting for rapid rise derailleurs.
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Old 08-15-06, 08:36 PM   #3
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Personally, I wouldn't go rapid rise on a touring bike. The concept makes sense for quick downshifting off road, but not for anything on pavement. But that's your choice, of course. But I don't think brifters will work with a mtb front derailleur, or at least not well. Different cable pull I believe.
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Old 08-15-06, 08:36 PM   #4
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thanks dude
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Old 08-15-06, 08:40 PM   #5
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I figure they must work builders like cannondale and co-motion use them
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Old 08-15-06, 09:00 PM   #6
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Originally Posted by dougfixit@hotma
I figure they must work builders like cannondale and co-motion use them
I doubt they use mtb front derailluers on their touring bikes with brifters. The rear derailleurs, yes, but not the front. If the frame you're using will take a bottom pull front derailluer, just use a road "triple" front derailluer, something like a 105 should work fine.
edit: see post below

Last edited by well biked; 08-16-06 at 06:41 AM.
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Old 08-16-06, 05:19 AM   #7
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Quote:
Originally Posted by well biked
I doubt they use mtb front derailluers on their touring bikes with brifters. The rear derailleurs, yes, but not the front. If the frame you're using will take a bottom pull front derailluer, just use a road "triple" front derailluer, something like a 105 should work fine.
I may have it wrong, but I believe the issue with front derailleurs is that you are more limited as to your chainring sizing with a given unit.


I use a rapid rise rear derailleur on the aforementioned Cross-Check, coupled with bar-con shifters on a Midge bar. Nice to be able to just palm the shifter from the drops.
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Old 08-16-06, 06:38 AM   #8
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Quote:
Originally Posted by dobber
I may have it wrong, but I believe the issue with front derailleurs is that you are more limited as to your chainring sizing with a given unit.


I use a rapid rise rear derailleur on the aforementioned Cross-Check, coupled with bar-con shifters on a Midge bar. Nice to be able to just palm the shifter from the drops.
I agree about the barcons. The thing with using brifters with a mtb front der. has come up before, though; it might work, but probably not very well because there's a slight difference in the amount of cable pull required between the road and mtb front deralleur units. Ideally, if he wants to use brifters on a tourer, he should get a 110/74 BCD crankset instead of a mtb model and fudge the gearing between what's typically "mountain" and "road", something like a 48t or 46t big ring, and he could go as low as a 34t middle ring and 24t inner ring. That way, the "road" front der. would work well with the cranks and the brifters. With a 46t big ring, I'm running a 105 front derailleur, although I did dremel the der. cage a little to better match the shape of the 46t ring.
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Old 08-16-06, 09:33 AM   #9
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Quote:
Originally Posted by well biked
he should get a 110/74 BCD crankset instead of a mtb model and fudge the gearing between what's typically "mountain" and "road", something like a 48t or 46t big ring, and he could go as low as a 34t middle ring and 24t inner ring. That way, the "road" front der. would work well with the cranks and the brifters.
Yep, that's the ticket, basically a "touring" crank.

http://aebike.com/page.cfm?PageID=30...ils&sku=CR1030
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Old 08-16-06, 11:52 AM   #10
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Got a 48-36-26 shimano octo hollow, anybody need an xtfront nib. Could save it though for the mountain rig. Thanks for the help guys, anybody know where there's a 105 9speed tripple (cheap).
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