Front Mech

dinyull
dinyull Posts: 2,979
edited May 2014 in Workshop
Just about to order a new 105 5700 double front mech to replace a seized Tiagra 4600.

First off, is it compatible? Don't see why not, but have seen on another website someone saying that the 5700 shifter used a diff method of, well, shifting and they aren't compatible.

Secondly, what size do I need? Options are 28.6mm/31.8mm OR 34.9mm. This one is confusing me as I ave just been down and measured the downtube on my bike and it measured about 33mm.

Cheers

Comments

  • chrisgal
    chrisgal Posts: 130
    There will be no compatibility issues. Take the 4600 derailleur off and the correct measurement should be inside the clamp.
  • dinyull
    dinyull Posts: 2,979
    Cheers.