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Old 12-26-07, 02:29 PM   #1
JackJ
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10sp Front Derailleur w/ 8 (or 9) speed chain?

I'm building up a frame with a Centaur CT 34/50 crank and an 8sp 13-30 cassette using downtube friction shifters. I need a front derailleur, and I'm wondering how well the Centaur FD made for a compact double will work with a wide chain. I'd like to use an 8sp chain since they're so cheap and reliable, but I could go 9 sp. Still, this front derailleur is designed for a 10 speed, so I'm concerned the extra chain width will result in either too much rubbing, or too much trimming.

Any thoughts? ("Search" wasn't working for me today, so forgive me if this has been discussed previously)

Thanks,
Jack

Last edited by JackJ; 12-26-07 at 02:35 PM.
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Old 12-26-07, 08:44 PM   #2
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Here's a thought: Would I be better off using a triple fr. der. when trying to use a wider chain in the application above?
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Old 12-26-07, 09:00 PM   #3
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I've used 10sp. front derailleurs with 9sp. chain and had no problems, especially with friction shifting. I don't know how 9sp. chain will work with an 8sp. cassette and rear derailleur though. This might help

http://sheldonbrown.com/speeds.html

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Old 12-26-07, 09:09 PM   #4
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Aha, here we go. Quoted from Sheldon's page that I linked to above:

Chain As you go to more sprockets on the cassette, you need a narrower chain. However, using a narrower chain with an older system rarely presents any problem. Thus, you can use a "9-speed" chain with a 7-speed or 8-speed system, or a "10-speed" chain with a 9-speed system. Since the chains designated for more gears are usually more expensive and don't last as long, this is not the ideal approach, but it's perfectly workable.
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Old 12-27-07, 08:24 AM   #5
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Good to know, thanks! I think I'll stick with the 9sp chain.
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