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Old 05-28-05, 12:20 PM   #1
Cipollini
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which one should i change?

Hi all. Currently, i have some issues with front derail. shiftings. Apparently, when i changed from largest chainring to smaller chainring, the chain will be sucked inside and stucked. This happened when the chain is at 3rd largest to largest cog. I know that my bike has some weird settings though. Here are some specs :-

STI : Durace 9-speed (double crankset)
BB : BB-5500
Crankset : It is a triple crankset(FC-5505) but without smallest chainring. The settting is 53t/39t
Front derail : FD-5504
Chain : CN-7701
Casette : CS-HG70-9 (13t-25t)

I tried to change the limit screws on the front derailleur but either it would get stucked inside the crankset or get dropped outside. One more problem that i`ve found is the chain is rubbing against the chainguard when the setting is smallest chainring with 3rd largest cog and above. The mechanic said it is normal but he has no idea how to solve this "chain-sucking" problem. I had no other choice but to read the manual and configure it by myself. Im just a newbie to road cycling and kinda confused. So, the question is, do i need to change any of these components? I thought of getting an Ultegra front derail(FD-6500) for double crank shifting. Or do i need to change the bottom bracket as im using the triple crankset compatible BB. The spindle length is 118.5mm. Im very confused and some guidance. Thanks for your guys time.
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Old 05-28-05, 02:53 PM   #2
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Originally Posted by Cipollini
Hi all. Currently, i have some issues with front derail. shiftings. Apparently, when i changed from largest chainring to smaller chainring, the chain will be sucked inside and stucked. This happened when the chain is at 3rd largest to largest cog. I know that my bike has some weird settings though. Here are some specs :-

STI : Durace 9-speed (double crankset)
BB : BB-5500
Crankset : It is a triple crankset(FC-5505) but without smallest chainring. The settting is 53t/39t
Front derail : FD-5504
Chain : CN-7701
Casette : CS-HG70-9 (13t-25t)

I tried to change the limit screws on the front derailleur but either it would get stucked inside the crankset or get dropped outside. One more problem that i`ve found is the chain is rubbing against the chainguard when the setting is smallest chainring with 3rd largest cog and above. The mechanic said it is normal but he has no idea how to solve this "chain-sucking" problem. I had no other choice but to read the manual and configure it by myself. Im just a newbie to road cycling and kinda confused. So, the question is, do i need to change any of these components? I thought of getting an Ultegra front derail(FD-6500) for double crank shifting. Or do i need to change the bottom bracket as im using the triple crankset compatible BB. The spindle length is 118.5mm. Im very confused and some guidance. Thanks for your guys time.
I'd take that mess back where you got it, let them sort it out or give you your money back. If that doesn't fly, get a 109.5 spindle BB, install it and then go to the repair section at www.parktool.com and learn how to adjust a derailer..and start from the beginning.
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Old 05-29-05, 10:23 PM   #3
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indeed. i`ll go for a 109.5 durace BB. Hope thats really solved my problem as my first race is coming on this sunday.
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Old 05-30-05, 06:58 AM   #4
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indeed. i`ll go for a 109.5 durace BB. Hope thats really solved my problem as my first race is coming on this sunday.
I'd get an ultegra.
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Old 05-31-05, 01:18 AM   #5
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coz it is cheaper??
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Old 05-31-05, 06:49 AM   #6
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coz it is cheaper??
And alot easier to install than a DA.
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Old 06-02-05, 11:23 AM   #7
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well, sadly, there is not stock for DA BB so i need to go for shimano 105 BB with 109.5 spindle length. To my much suprise, the problem still the same. Front shifting problems whenever i wanted to change from larger chainring to smaller chainring. Tuning the front derailleur wont help. So, i turned to shimano FD-5505 service manual and it stated that this Front derailleur can be used at triple chainring only as the shifting point dont match. I had changed both my chainrings to 39t/53t and i assumed it is a double crankset. But the mechanic hestitated that it is BB problem but the result turned out it wasnt BB problem. But somehow, after he did some tunings at rear derailleur's tension screw, the front derailleur shifts perfectly now. I dont see any idea how does that rear derail's may affect the front gear shiftings.. And in my next upgrade, should i changed double chainring's front derail or a new rear derail for double chainring system? FYI, im using shimano 105 rear derail which has a long cage just like a mountain bike's rear derail Hope that someone can help me.
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Old 06-05-05, 10:24 PM   #8
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and again, the chain started to fall again......
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Old 06-06-05, 12:43 PM   #9
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It's a complicated problem, compounded by the chain type and the overall setup. Generally, the chainline should be middle rear cog aligned between the front small and large cog. You can't be exact without some alignment tools, but you should be able to sight over the cogs to the chainrings and see if there's a gross misalignment. If there is, changing the bottom bracket spindle is usually the correction. The triple chainrings have extra stuff on'em to make 'em easier to get onto the little chainring. You might be running up against that - it sounds like the chainrings are too far outboard. If you gotta race (and can't borrow something), then you'll have to remember to shift to the little chainring from a little back cog...I know that ain't gonna work in the heat of the moment, tho. good luck.
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