FD-R9100 low limit problem

Discuss light weight issues concerning road bikes & parts.
RussellS
Posts: 790
Joined: Wed Feb 03, 2010 1:31 am

by RussellS

It looks like maybe the front derailleur braze on is causing the problem for you. Maybe some grinding and filing and bending on it will help get the front derailleur closer to the seattube. It would be interesting if you had a clamp on front drailleur of the same model and bolted it onto the frame right above the current braze on derailleur. And look from above to see the difference in how close the derailleur is to the seattube. I'm betting the clamp on derailleur would be a lot closer to the seattube. The braze on mount is causing the problem.


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ave
Posts: 1744
Joined: Sun Dec 28, 2008 10:15 pm
Location: Hungary

by ave

I measured my other 2012 S5 frame. That bike has a 7800 FD. The mounting bolt's centerline is the same distance from the seat tube.
There's quite a big gap between the chain and the cage on that bike.

So next thing is I'll try an older FD on the new frame.

eric01
Posts: 547
Joined: Mon Feb 06, 2006 1:06 am

by eric01

I had some problems with my Ax Vial Evo and 9100 front derailleur too. Opposite problem -- i couldn't get it to swing far enough out to shift onto the big ring without rub.

This video was helpful:
https://www.youtube.com/watch?v=YNYf_QgPLqM

Still couldn't get it to work for me so I went back to 9000 series front derailuer. No big deal as I had a spare one.
AX Lightness Vial Evo, Carl Strong Titanium

eins4eins
Posts: 50
Joined: Wed Sep 28, 2016 11:49 am

by eins4eins

same problem on my S5. Can't get the FD set up for the same exact reason.
Chainline is not the problem and as i'm running GXP cranks, i can't move the crank further out to the right.

The new cable routing of the FD 9100 simply doesn't work with the S5 i think.

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ave
Posts: 1744
Joined: Sun Dec 28, 2008 10:15 pm
Location: Hungary

by ave

@eins4eins,
Good to know that it's not the crankset then! What is your solution? Did you try older FDs?

@eric01,
I watched that video before install, it is helpful.
I'll try to get a 6800 FD, I hope it will help.

Strange problem, as Cervelo do sell S5 with mechanical 8000 at least. (I'd think 8000 and 9100 are almost identical)
https://www.racycles.com/road/cervelo/c ... bike-14455

I guess Shimano tries to convince me to go the Di2 route.
As the rear shifting also worse than with 9000 on my LOOK 586 (no internal cable routing of course), I think the only real solution for modern aero frames is electronic shifting.
I used cheap shifting cables, not the polymer coated ones, perhaps they would help.

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ave
Posts: 1744
Joined: Sun Dec 28, 2008 10:15 pm
Location: Hungary

by ave

I tried a FD-6800, it was the same.
I decided that the best solution is to tilt the cage inwards, so it's not really parallel with the big ring.
I can now use every gear with no rub, but front shifting to the big ring is not perfect, as the cage that should push the chain outwards is not moving out enough. It takes a bit of time to put it on the big ring. But it works.

alcatraz
Posts: 1298
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Check that your crank arms are equally distanced from the middle of your down tube.

Maybe you have the crank more to one side than it should be. Like a bbright frame using a bb86 bottom bracket or similar.

/a

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