I purchased the 34/50 octaramp chainrings to go with the crankset, and have had nothing but problems with them. They are being used with a Dura Ace 9000 setup, and the chain refuses to move to the big ring unless the front derailer swings so far out, it rubs on the chain when on the small ring. The rings have no pins and the ramps seem to be ineffective.
Is there some secret I'm missing in regards to getting proper function out of these rings?
Have you mailed Extralite and asked them?
A bit weird, I was told no-one complained on this setup, still i was recommended not to buy it, which i didn't.
However there was a guy who mentioned he used QRC-2 and i think he was OK with them!? Not sure though..
Ax Lightness Vial EVO D
Paduano Racing Fidia
https://opencycle.com/showcase/the-xplo ... eelsonfire
I don't understand your statement: "the chain refuses to move to the big ring unless the front derailer swings so far out, it rubs on the chain when on the small ring". Are you talking about the angle of the cage relative to the chainrings? The flat part of the outer cage should be parallel to the face of the chain rings. Or, are you talking about the position of the inside limit screw? That shouldn't influence whether or not the chain gets up on the big ring.
You shouldn't need any special setup. I would suggest going to the Shimano installation instructions and follow them carefully.
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Qman wrote:I don't understand your statement: "the chain refuses to move to the big ring unless the front derailer swings so far out, it rubs on the chain when on the small ring". Are you talking about the angle of the cage relative to the chainrings?
The shifting lever has four positions and will pull the cable a certain length as one moves from the first position to the last (with the first two being small ring, last two big ring of course). Assuming the limit screws are at their max, in order to get the chain on the big ring I need to pull enough cable to get the derailer almost far enough right to start rubbing the crank arm (the QRC2s have a rather low Q Factor). However, when I move the shifter back down to the small ring on first indexed position, the derailer rubs slightly on the chain because there is no more cable the shifter can release. If I use a barrel adjuster to compensate for this by giving the derailer more cable, and eliminating the rub, when I shift in to position 3 and 4 the chain refuses to climb to the big ring and just slips. I attribute this to the lack of pins and inadequate ramp design.
I did have this setup working on a different frame at one but, but even then the chain took a long, noisy time to mount the big ring because it just wouldn't catch. Suffice to say I was very disappointed that my shift quality worsened considerably moving from an old 6500 crankset & rings to the Extralite rings.
Have sourced some Shimano R700 rings to hopefully return my sanity.
I'll be installing bar-end shifters tomorrow (which, for the FD, are friction operated) which will involve re-cabling/adjusting the FD. If the problem persists after that I'll have to write to Extralite.
I understand perfectly, when you say "the chain refuses to move to the big ring unless the front derailer swings so far out"
I run my octaramp 34/50 rings on lightning crank and a Sram Red 22 set up. At first, i had big problems shifting up front using the stock cable and housing provided by sram, but after I made the change to the Alligator system, the problem has stopped. In my case I messed with the FD for hours to get it working right, but in the end I ended up taking it to my master mechanic to get it working perfectly. try different cable and housing, it wouldn't hurt.
quick question, are you wring the older 84g version or the newer 94g ones?
They are less than 3 months old, so the 98 gram version.
The 9000 front derailleur is definitely a very different design and it requires careful setup. It sounds like you've already spent a lot of time on this, and perhaps you've already carefully followed all the installation instructions, but just in case you haven't, it looks like there are a couple of areas that are typically not properly setup on these derailleurs.
1. Support bolt and backup plate. If you have a braze-on FD then make sure the backup plate is there and the support bolt is touching the plate.
2. Cable Angle. Use the tool to establish the position for the converter. This compensates for the cable exit point on your frame.
3. Cable wrap at the pinch bolt. There are many ways to wrap the cable, and Shimano indicate the correct way for your particular setup.
4. Cable Tension. Adjust this in the top trim position (the first click down on the big ring), and with the chain in the big-big combination. The inner FD plate should be between 0 and 0.5mm from touching the chain. Increase the tension a little if you're still having difficulties getting onto the big ring.
This derailleur needs lots of cable tension, similar to the SRAM yaw. In contrast, the FD-7900 requires a slack cable!
Here is an interesting link regarding setup problems with the FD-9000: http://velonews.competitor.com/2015/03/bikes-and-tech/technical-faq/technical-faq-shimano-11-speed-front-derailleur-cable-setup_363733
If none of this helps then it must be a problem of compatibility with the rings. They are nice rings and they save some weight, but it's not worth it if they simply don't shift up!
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