105 5600 compatibility with new front mechs

trowakage
trowakage Posts: 2
edited June 2018 in Workshop
My wife's 105 5600 2x front mech just broke (a small chunk of the spring snapped off where it rested against the pull arm) and I was wondering which of the newer FDs would work as a replacement since the 5800 is 11s now? Would the Tiagra 4700 FD work? Or do I need to try and find an older 5600/5700 FD?

Comments

  • topgunsteve
    topgunsteve Posts: 43
    4700 won't work as it although it is 10 speed it uses the same cable pull ratios as the newer 11spd kit. You might be able to source a tiagra 4600 front mech, they should work
  • keef66
    keef66 Posts: 13,123
    Anything 10 speed apart from 4700. So 4600, 5600, 5700, 6700. or indeed 9 speed and earlier.

    They changed the pull ratio for the move to 11 speed, and annoyingly for 10 speed 4700 too
  • photonic69
    photonic69 Posts: 2,781
    I can confirm that a Tiagra FD4700 works perfectly with 105 5600 LH shifters. I used one on my daughter's bike as it had a nigger mechanical advantage as she found the FD shifting quite hard due to the cable routing. Works very well


    Sometimes. Maybe. Possibly.

  • Chimera2018
    Chimera2018 Posts: 106
    keef66 wrote:
    Anything 10 speed apart from 4700. So 4600, 5600, 5700, 6700. or indeed 9 speed and earlier.

    They changed the pull ratio for the move to 11 speed, and annoyingly for 10 speed 4700 too

    Surely pull ratio doesn't matter with a front mech, as it's the shifter that determines how far the mech moves? And it only has to move between two chainrings.
  • arlowood
    arlowood Posts: 2,561
    Chimera2018 wrote:
    keef66 wrote:
    Anything 10 speed apart from 4700. So 4600, 5600, 5700, 6700. or indeed 9 speed and earlier.

    They changed the pull ratio for the move to 11 speed, and annoyingly for 10 speed 4700 too

    Surely pull ratio doesn't matter with a front mech, as it's the shifter that determines how far the mech moves? And it only has to move between two chainrings.

    It does actually because the new 5800 and 4700 front mechs changed design to feature a longer actuating arm so that the shifter had to pull less cable to achieve the same horizontal movement of the front mech cage. However it would seem that the differences are probably not that important as PhotoNic69 has got the 5600 shifter to work OK with a 4700 FD
  • keef66
    keef66 Posts: 13,123
    arlowood wrote:
    Chimera2018 wrote:
    keef66 wrote:
    Anything 10 speed apart from 4700. So 4600, 5600, 5700, 6700. or indeed 9 speed and earlier.

    They changed the pull ratio for the move to 11 speed, and annoyingly for 10 speed 4700 too

    Surely pull ratio doesn't matter with a front mech, as it's the shifter that determines how far the mech moves? And it only has to move between two chainrings.

    It does actually because the new 5800 and 4700 front mechs changed design to feature a longer actuating arm so that the shifter had to pull less cable to achieve the same horizontal movement of the front mech cage. However it would seem that the differences are probably not that important as PhotoNic69 has got the 5600 shifter to work OK with a 4700 FD

    That's interesting to know. They are certainly not compatible according to Shimano. I wonder what real world compatibility is like with the new generation front mechs which have abandoned the longer arm??

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