Bicycle Mechanics - Ultegra rear deraileur compatible with Tiagra cluster?

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Falchoon

07-26-04, 12:38 AM

I've been trawling Ebay and seen a cheap Ultegra rear deraileur and was wondering if it would be compatible with my near new Tiagra cluster? The same guy had a cheap Ultegra cluster but my Tiagra has only done a couple of hundred kms and it seems like a waste to get rid of it whereas the bike shop did manage to service my rear deraileur but said it will need replacing in the not too distant future. I presume my near new chain will be compatible? The parts on Ebay are new and not second hand.

khuon

07-26-04, 12:46 AM

Short answer is maybe. It depends on what kind of derailleur and what teeth gearing you have both front and rear. It's not a matter of level of derailleur as much as specific type and if you're exceeding tooth capacity and such. In general, if you have a triple chainring front crank, you'll need a GS type derailleur which has a longer cage.