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Converting triple to double crankset(4 posts)

Converting triple to double cranksetbigwaves
Dec 13, 2003 7:52 AM
Hi there,

I have a trek 5200 that is a triple crankset. (I live in a very hilly area.) I was noticing that FSA has a compact road crank thats has a 34 ring. This would be perfect for my normal rides.

What would i have to change on the bike to convert it back to a double. The bike is currently all ultegra.

Thanks in advance.
re: Converting triple to double cranksetRusty Coggs
Dec 13, 2003 8:22 AM
The shifters work with double or triple. You need matching BB for the crank. Derailers are optional,but for my nickel,I'd replace than with double stuff. Chain might also need shortening a bit.
re: Converting triple to double cranksetlithiapark
Dec 13, 2003 8:48 AM
1) new front derailleur, standard Ultegra double will work, because the inner plate of the triple FD is likely to rub the 34 ring, at least it did for me
2) If you have an octalink BB the FSA can be had to fit that
3) the triple RD will work fine, a standard RD, short cage may work, I'm goint to try it
4) I run a 12/27 cassette with the 50/34 and shortened the chain one link
5) shifters will work

I like this setup, altho some don't like the larger gaps between gears that the 12/27 gives, it gives about the same lowest gear as a 53/40/30 with a 12/25.
re: Converting triple to double cranksetdavidcuttler
Dec 13, 2003 7:45 PM
I think the hot setup is to replace the rear deraillur with an XT and install an 11-34 rear cluster. Up front replace everything with a 107mm bottom bracket with the square drive, and use a Sugino double with a 46-34. I ride in the San Fransisco Bay area and this setup worked great on my fuji team.

Another way is to leave the rear alone and install a Sugino triple up front using a 107 or 110 bottom bracket. I did that on my Novara Strada which I keep at work to ride during lunch time. The triple has a 26-36-48. Unless you are racing, and need the higher gearing for decents, you probably will not miss the larger 52 tooth chain ring.