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Upgrading Tiagra to Ultegra, beyond(4 posts)

Upgrading Tiagra to Ultegra, beyondwulf
Apr 29, 2002 11:25 AM
My girlfriend recently picked up a LeMond for a good price, but it's loaded up with Tiagra components. She's a pretty decent cyclist, and wants to upgrade to Ultegra or Dura Ace, but I'm wondering what parts can I piece-meal together?

For example, can I throw a Ultegra crankset on to the existing bottom bracket, and have the tiagra derailluers still function?

She needs/wants better components, but we can't afford everything at once, so I'd like to find out what parts can be switched out, piece by piece....

Thanks for your help.

- Wulf
Do it!Uncle Tim
Apr 29, 2002 12:30 PM
I've done this very thing and have turned a so-so bike into a very nice bike.

All of the parts should be interchangable. Start by trading out that very heavy (UN-52) bottom bracket. Replace it with and Ultegra BB and matching octalink Ultegra crank. They come in either double or triple spindle lengths so be sure to get the right size.

As long as everything is 9-speed, the shifters and derailleurs will work together. The Tiagra shifters are really pretty good.

The only complication you will run into is if you decide to go from triple to double or vice versa. If you do it right, you would make the effort to get the appropriate front and rear derailleurs to accomodate any switch. But if you are staying with a triple crank, then you don't need to buy new derailleurs. They will work.
Do it!weiwentg
Apr 30, 2002 10:02 AM
all the parts are interchangeable except for the cranks and BB - the Tiagra groupset does not haev a spline. I would just get a whole Ultegra groupset from www.abicibikes.com or www.gvhbikes.com, but if you are doing it piecemeal, I'd change the rear derailleur, cassette and cranks/BB at minimum.
thanks guys (nm)wulf
Apr 30, 2002 3:05 PM