Originally Posted by
domlv
Looking to upgrade the drivetrain on my Cannondale Ironman 600 (mix of 105 and Tiagra components) to a complete 105 or Ultegra set. Would this be a direct swap or are there other considerations I should take into account? I'm wanting a lighter and more reliable drivetrain for longer distances. Total noob so any advice is appreciated.
I doubt you will encounter much problems. Also there is no reason, other than wear and ajdustment that your old drivetrain cannot function as good as the 105 or ultegra (save for the possible newest 6700 group - but that will entail changing more than just the drivetrain bits.
Chain, cassette, bottom bracket and crankset are likely to be no problem. Same with the derailleurs.