Bicycle Mechanics - Using a 10-spd Campy derailleur on a 9 spd?
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04-25-07, 01:21 PM
Quick question - is it possible to use a (long cage) 10 speed campy rear derailleur on a 9 speed bike? (Bianchi Veloce triple - want to change from 13-26 to 13-28 but need to swap my current medium cage to a long cage. Looking at some on eBay as I'm on a budget. ;))
Thanks so much! :D
Why? Your medium cage RD should handle a 13-28, or am I missing something?
I use a campy short cage on a 13-26, medium should handle 28 teeth easy unless you have a really wide range triple up front. What is the big and small ring count?
04-25-07, 02:16 PM
The campy site (among others, I think I actually read it on here :)) claimed you need a long cage for anything bigger than a 13-26 with a triple. I have a 30-42-52 on the front.
Oh wait, I think I just answered my original question. ;) http://www.campagnolo.com/qea_search.php?gid=all&cid=1&pid=175&key=comp&rev=1
(See FAQ #1.)
If I didn't have to switch the derailleur to work with the 13-28, that would make me verrrrry happy. :D
The numbers campy, shimano, sram ect. give you are usually a few teeth conservative. Just make sure your chain is long enough and I think you'll be fine.
Assuming that the chain lenfth is correct, if you experience slack chain when in a small ring to small cog combination then you do need a long cage derailleur, or stay out of that combination. Don't ride with a slack chain.
04-25-07, 03:19 PM
Assuming that the chain length is correct, if you experience slack chain when in a small ring to small cog combination then you do need a long cage derailleur, or stay out of that combination. Don't ride with a slack chain.
That's the essential recommendation. There is no reason to ride in small-small or even the small chainring/smallest two or three cogs. The same gear ratio can be has in the middle ring with the larger cogs. The manufacturer's cage length recommendation is based on assuming the rider doesn't know to avoid the combinations that are useless. If you are reasonably knowledgeable, you can easily use your current rear derailleur.
04-26-07, 10:58 AM
Awesome, thanks! My biggest issue is finding myself constantly switching between the 30 and 42 as I'll run out of steam on the 42-26, then shift to the 30 and find myself cross-chaining when the going gets easier. I like to spin, plus I find a real "granny gear" helps me on the hills. :D
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