9 Speed Front Derailleur on 8 Speed Drivetrain?
Can I fit a 9 speed front derailleur to my 8 speed drivetrain? I'm just worried the derailleur cage may be too narrow because 9 speed chains are narrower than 8 speed.
What I really want is a 31.8mm band on 8sp front derailleur. But I can't find them anywhere
What I really want is a 31.8mm band on 8sp front derailleur. But I can't find them anywhere

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I think they are a tad narrower. More of an issue on triples than doubles. You could always run a 9spd chain. That will work okay on a 8spd cassette and free you up to fit a 9spd front mech.Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer0
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Hi, it will work ok but the chain might rub on the cage if running on the outer extremes of the cassette.He is not the messiah, he is a very naughty boy !!0
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I run a 9sp Ultegra front derailleur on my 8sp TT bike.
It does seem to need a fair bit of trimming as I move up and down the block, but then I'm running bar-end shifters, the front not indexed and it's no problem.0 -
http://www.chainreactioncycles.com/Models.aspx?ModelID=13619
Use with a 31.8 band adaptor SM-AD11.0 -
I already get slight chain rub on the inside of my derailleur cage btw. So, who knows, maybe I already have a 9 speed derailleur! (Wouldn't surprise me as the bike initially had brake cable attached to the rear mech etc. :roll:)
Luckily the rubbing's only noticeable in exteme gears though, and I can minimize that with trimming, so it's okay. It's a double, incidentally - 39/53.
I ended up buying an 8-speed Sora mech with a braze on fitting from wiggle. Couldn't find any band ons. Will get that adapter too. Cheers.0