Fd inner limit
10-15-12, 12:29 PM
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Fd inner limit
When in the lowest gear 34 in front and 28 in back chain rubs on inner guide of FD even though limit is adjusted as far inwards as possible and wire is slack. Added a small washer under the screw joining the outer and inner guide to open it up a bit. Only a slight improvement.
FD ultegra, cranks 3D rotor with compact Q-rings.
Any recommendation is appreciated.
YannisG
FD ultegra, cranks 3D rotor with compact Q-rings.
Any recommendation is appreciated.
YannisG
10-15-12, 12:52 PM
#2
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Is the FD on straight?
Does the FD bang into the seat tube ? that is the hard stop.
maybe the chainline is off. and you need to do something to the front .
If it were a 3 piece crank , you could change the BB length.
Might mean going to a bike shop that can see things in motion.
that cant be done in text.
Does the FD bang into the seat tube ? that is the hard stop.
maybe the chainline is off. and you need to do something to the front .
If it were a 3 piece crank , you could change the BB length.
Might mean going to a bike shop that can see things in motion.
that cant be done in text.
10-15-12, 01:08 PM
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"Does the FD bang into the seat tube ? that is the hard stop." Or hitting something else?
I recently had a bike where the FD would hit the water bottle cage until I spaced the cage away so it would clear.
You may also be able to file off some metal where the low limit screw hits, to make the FD move a little farther inboard.
Did you change something else recently, like the BB or crankset?
I recently had a bike where the FD would hit the water bottle cage until I spaced the cage away so it would clear.
You may also be able to file off some metal where the low limit screw hits, to make the FD move a little farther inboard.
Did you change something else recently, like the BB or crankset?
10-15-12, 01:19 PM
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I have to ask when you set the low limit screw did you remove the cable first it may not be moving if the cable has no slack.
Remove cable set low limit screw move any barrel adjuster in re-attach cable remove slack with barrel adjuster shift up set hi limit screw.
Make sure FC is aligned with outer chain ring.
Some other things to look at but start here,
Remove cable set low limit screw move any barrel adjuster in re-attach cable remove slack with barrel adjuster shift up set hi limit screw.
Make sure FC is aligned with outer chain ring.
Some other things to look at but start here,
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10-15-12, 01:36 PM
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You need to tell us when the problem started and what if any changes were made in derailleur, crankset/BB, or rear wheel/cassette at that time.
10-15-12, 02:09 PM
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Ok,
First thanks for yr responses.
The problem started when I changed from an Ultegra compact crankset to the 3D rotor crankset. I replaced the BB Dura-ace brgs with rotor's to avoid any incompatability.
So basically the chain line has changed and the 3D rotor sits slightly closer to the frame, and the FD cannot compensate for this change at its inner most limit. Problem is; how do I correct it?
YannisG
First thanks for yr responses.
The problem started when I changed from an Ultegra compact crankset to the 3D rotor crankset. I replaced the BB Dura-ace brgs with rotor's to avoid any incompatability.
So basically the chain line has changed and the 3D rotor sits slightly closer to the frame, and the FD cannot compensate for this change at its inner most limit. Problem is; how do I correct it?
YannisG
10-15-12, 02:24 PM
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Both on the Ultegra compact and the 3D rotor crank sets the BB spindle is an integral part of the crankset which as far as I know is standard for the 68mm BB housing.
Thanks,
YannisG
Thanks,
YannisG
10-15-12, 02:38 PM
#10
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Might be able to add a spacer on the DS bearing to move the chainline out a bit.
10-15-12, 02:39 PM
#11
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+1, maybe shim under the right side bearing assembly
so it tightens against that, then the crank moves rightward.
Or maybe you broke up the Shimano Ultegra groupset,
that the Engineers in Osaka had made to go together ,
and this is the consequences.
so it tightens against that, then the crank moves rightward.
Or maybe you broke up the Shimano Ultegra groupset,
that the Engineers in Osaka had made to go together ,
and this is the consequences.
Last edited by fietsbob; 10-15-12 at 02:43 PM.
10-15-12, 03:05 PM
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Thanks for yr reponses,
A shim in between right brg and BB housing surface seems to be a good solution. I'll give it a try.
Thanks.
YannisG
A shim in between right brg and BB housing surface seems to be a good solution. I'll give it a try.
Thanks.
YannisG
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