What is difference between double and triple front mech?
When I bought my CR-1 I had the shop swap the 105 double chainset for a triple, the left shifter has a label on it saying it was double or triple compatible so nothing else was changed.
For a while it worked well but I am now having trouble (occasionally) dropping onto the granny ring. I stopped at the Mavic support on a sportive recently and they said the issue was the the mech was set too high however I have had to do this because the inner plate of the cage fouls against the middle chainring when I go onto the big ring otherwise.
When I look at the profile of the cage the curve on the inner plate appears to have a much smaller radius than the middle chainring (40 tooth) so instead of following it's profile neatly I have to set it vey high so the trailing end does not foul but this leaves the front of the cage sitting a long way above the rings with the consequent poor shifting.
I guess my question is, is the mech on the bike a double or triple mech, as it was origionally set up to be a double or is it by definition a triple because it works with a triple chainset? Would a new Triple specific mech (6603) have a different profile cage allowing me to drop the mech a little lower?
Many thanks in advance.
For a while it worked well but I am now having trouble (occasionally) dropping onto the granny ring. I stopped at the Mavic support on a sportive recently and they said the issue was the the mech was set too high however I have had to do this because the inner plate of the cage fouls against the middle chainring when I go onto the big ring otherwise.
When I look at the profile of the cage the curve on the inner plate appears to have a much smaller radius than the middle chainring (40 tooth) so instead of following it's profile neatly I have to set it vey high so the trailing end does not foul but this leaves the front of the cage sitting a long way above the rings with the consequent poor shifting.
I guess my question is, is the mech on the bike a double or triple mech, as it was origionally set up to be a double or is it by definition a triple because it works with a triple chainset? Would a new Triple specific mech (6603) have a different profile cage allowing me to drop the mech a little lower?
Many thanks in advance.
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2010 Cube Agree SL
From your description, it sounds as if the derailleur is mounted at the wrong angle. I'm not familiar with the CR-1, but if it has a "braze-on" mech attached to a bolt-on frame mount it would be worth checking that the mount is fitted correctly. BTW, it's usually possible to "adjust" the angle of the cage somewhat by levering it with a large screwdriver, however, damage can be done, so it may be best to get your bike shop to do this if this is you(!): http://www.buncombe.k12.nc.us/986201030 ... clined.jpg
Thanks both for your feedback.
Yep the "someone" who put the 40T on was me :oops: don't know why but thought the one I was replacing was also a 40T and didn't realise til too late. Even so the arc of the mech cage is still tighter than a 39T so same problem still exists.
Think I'll give the screw driver adjustment a swerve, ripping the mount out of the carbon fibre downtube would be an expensive mistake I suspect!
I'll have a hunt around the mech and see if I can find the part number somewhere.
Cheers.
Pace RC200 FG Conversion (FCN 5)
Giant Trance X
My collection of Cols
Anyone want a 40T TA middle chainring, one careful owner.....
Pace RC200 FG Conversion (FCN 5)
Giant Trance X
My collection of Cols