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PostPosted: Tue Jun 24, 2014 3:06 pm 
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Joined: Fri Jun 01, 2012 6:40 pm
Posts: 201
I'm thinking of building up my new rig with the yet-to-be-released hydraulic/mechanical Shimano STI's and disc brakes. The frame has the cables routed over the top. I'd prefer to avoid using a pulley which makes my most attractive option the slightly older CX70 FD from Shimano. Will this FD work with the 11 speed chain ring spacing and cable pull?


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PostPosted: Tue Jun 24, 2014 7:20 pm 
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Location: Houston, Texas
Not exactly the answer you are looking for but having run a DA FD-9000 front derailleur with DA 7900 shifters, I think you will find that with the CX-70, as a result of spacing and cable pull, no amount of adjustment will prevent cable rub at one end of the range or the other.

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PostPosted: Wed Jun 25, 2014 1:51 am 
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I always have the umlenker option but something without those hacks would be far better imo. Top-pull fd's just don't seem to be that common...


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PostPosted: Tue Jul 08, 2014 10:42 am 
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Location: The Netherlands
I am having the same issue with the front derailleur, seeing as my frame does not have a mount for a cable pulley. For Shimano the only option is the CX70 front derailleur, although it is made for 46 chainrings. As such you might need to shave of some of the cage, to make it work with bigger rings.

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PostPosted: Tue Jul 08, 2014 2:39 pm 
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If you look here (http://theradavist.com/2013/06/beautiful-bicycle-my-geekhouse-woodville-touring-bike/#1) you will see John Watson's touring. He somehow managed to make a SRAM Force FD work with a top pull system. No idea how he did that :noidea: .

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PostPosted: Wed Nov 12, 2014 6:38 pm 
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Joined: Thu Jun 14, 2012 3:01 pm
Posts: 86
dvincere wrote:
I'm thinking of building up my new rig with the yet-to-be-released hydraulic/mechanical Shimano STI's and disc brakes. The frame has the cables routed over the top. I'd prefer to avoid using a pulley which makes my most attractive option the slightly older CX70 FD from Shimano. Will this FD work with the 11 speed chain ring spacing and cable pull?

There's 3 of em on 3 CX bikes in my garage. Work great with both 6800 and 9k shifters.

Maybe not *quite* as slick as the 6800/9k derailleurs, but they work fine.

Otherwise, you're looking at an Umlenker-type solution.

M


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PostPosted: Thu Nov 13, 2014 12:30 am 
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Location: Melbourne, Australia
I'm using CX70 top pull with SRAM Force 22 and Praxis Rings. It's worked faultlessly with both 36/46 and 36/52 ring sizes.

I believe Shimano actually list 52 as the biggest ring it's designed for.

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PostPosted: Sun Mar 13, 2016 2:04 am 
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Joined: Sun Mar 13, 2016 1:59 am
Posts: 1
I know this post has been dormant for a while. I had a brain fade when I posted the first version of this post saying that the CX70 derailleur would not work with Ultegra 6800 11 speed shifters. I'd spent a long time unsuccessfully trying to get the CX70 derailleur to work with 6800 shifters and I was frustrated and angry. I have now got it working, but only after considerable fettling.

I can now clarify that the CX-70 Top Pull derailleur CAN work with Ultegra 6800 shifters. But it might take some time and I suspect success may be dependent on your frame's geometry & the diameter of its seat tube.

I recommend you try setting the lower gear adjustment screw in to its absolute maximum so that it holds the derailleur out at its extreme big ring setting while fixing the cable to the derailleur. You may then need to slightly rotate the DR around the seatpost. On my frame, I had to play a lot with the height of the DR and its orientation to the seat tube—0.5 (or less) of a millimetre made a big difference. Once you've got the derailleur working without rubbing on the big ring, you can then unscrew the inner adjustment screw to its correct setting.

In any case, all is now right with my world. At least, most is now right. Apologies for any offence or misinformation.


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