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Old 07-30-09, 04:35 PM   #1
hairnet
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compataility question

I'm picking up a friend's Ultegra double 53/39 crank set today and I want to know if I should install it or wait to buy some new components.

Right know I have Tiagra triple front derailleur and 105 9speed rear derailleur. After using the search function I found I can keep my brifter and FD if I adjust the gear limits, but maybe there is more I should know. I also need to know if my RD will work well with the double crankset since it is a long cage derailleur.
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Old 07-30-09, 04:45 PM   #2
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Not sure why you would want to do this. You will be losing climbing ability.
You haven't said what the crankset generation is, 9-speed, 10-speed, etc.
It will probably work.
You will need a new bottom bracket in the correct length for a double. It will need to be compatible with your crankset and your frame.
What you will need to adjust are the front derailleur limit screws.
Follow the front derailleur adjustment instructions found at http://www.parktool.com precisely. Do not leave any steps out.
If you do the work yourself you will need the correct tools.
Is it worth it for a small weight savings?
You will not need a new rear derailleur, the weight savings of a short cage RD are very small.
Is the frame worth spending a lot of money for components? Usually the answer is no.

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Old 07-30-09, 05:03 PM   #3
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the reason I'm even curious about this is because he only wants $20. I hardly use my granny gear anyway

Ok, so seeing that I'll need a new BB I may take the cranks and wait.

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