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Old 05-21-06, 07:53 AM   #1
netorius77
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FD-M760 Compatibility with 8 Speed

I am looking at replacing the FD on my Giant ATX. I have an 8 speed system and was wondering if I could use the Shimano FD-M760 (XT) as a replacement with my existing worn out Alivio. The Shimano website states the following for the M760: "Rear Compatibility: 9-speed" From this it appears it is probably not compatible with my slightly wider 8 speed chain. Is my assumption correct - does anyone have any experience? Looking forward to any recommendations.
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Old 05-21-06, 12:06 PM   #2
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As a general rule all Shimano index compatible rear derailleurs (obligatory disclaimer: except pre 9-speed Dura Ace) are compatible with any speed shifter. Certainly 7,8 and 9-speed rear derailleurs can be used interchangably on 7,8 and 9-speed cassettes.

Yes, the "9-speed" XT will work fine as a replacement for the "8-speed" Alivio.
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Old 05-21-06, 12:28 PM   #3
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The OP was asking about FRONT deraillers. That said, a 9sp FD will probably only work OK with a 8sp system, although not optimally because the FD side plates are slightly closer together to accomodate the narrower 9sp chain. Best to get a FD designated 8sp if you want absolute best performance. The difference may be hardly noticeable.
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Old 05-21-06, 05:00 PM   #4
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Quote:
Originally Posted by kenhill3
The OP was asking about FRONT deraillers.
Are you sure about that?

Quoting from the OP: "The Shimano website states the following for the M760: "Rear Compatibility: 9-speed"." From that I took it to mean he was concerned about a REAR derailleur
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Old 05-21-06, 05:21 PM   #5
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Quote:
Originally Posted by HillRider
Are you sure about that?

Quoting from the OP: "The Shimano website states the following for the M760: "Rear Compatibility: 9-speed"." From that I took it to mean he was concerned about a REAR derailleur
Yes, I understand your read of the poster. Your take on the compatibility of rear deraillers is indeed correct .
My understanding was that concerning a Rear Derailler, since the model designation used was: FD M760, which to my knowledge means: Front Derailler, Mountain, 760(series).
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Old 05-21-06, 06:19 PM   #6
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Sorry about the confusion guys. I am looking at replacing the Front Derailleur (FD M-760) - the confusion came from the website where it states "compatibility with rear" which states 9 speed only. I did suspect that the chain width would be an issue. I will try and find a compatible one that is reasonably aquirable.

Thanks for the responses and sorry about the confusion!
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Old 05-21-06, 07:36 PM   #7
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Quote:
Originally Posted by kenhill3
My understanding was that concerning a Rear Derailler, since the model designation used was: FD M760, which to my knowledge means: Front Derailler, Mountain, 760(series).
I guess I read just enough to not get all the details. You're absolutely right, FD does mean a front derailleur.
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Old 05-21-06, 10:17 PM   #8
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Ok, I have checked out the Shimano web page and the only 8 spd Front Derailleur (FD) they recommend is the Alivio FD-M410. Surely I can mount a better FD than this without compatibility issues with my 8 spd chain.

I have already upgraded my existing RD to a XT Deore M-750 which works pretty well except when the chain is at the opposite extreme gears (sorry I can't think of the correct technical term) where the chain does rub a bit. My LBS reckons this will go away as it wears in, and I don't often ride in this configuration anyway.

I was hoping to fit a Deore XT or minimum LX but now a little weary as to have both the RD and the FD "slightly problematic" will probably be more frustrating that just installing a new Alivio.

Another thing is I can get a XT FD cheaper on eBay than an Alivio (with Alivio not easy to come by anyway)! My existing FD is a 34.9mm diameter TP (top pull) arrangement.

Has anyone used anything succesfully other than the Alivio?
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Old 05-21-06, 10:44 PM   #9
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Was there something about the Alivio you didn't like? Honestly, for a FD, there won't be any noticeable difference, and if you're going to run eight speed, the Alivio is the one to get these days. Nashbar usually has Alivio stuff, and the FD's are dirt cheap. I've got two Alivio FD's in my household right now, one on my wife's cruiser and the other on my son's mtb, both eight speed with Rapid Fire shifters. Both bikes shift as smooth as can be, and my son's mtb has a Deore RD, Alivio FD, Rapid Fire shifters, and in all honesty it's as smooth as my all-XT nine speed rig. The XT stuff is lighter, but for just the FD, there would be no meaningful difference at all.
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Old 05-22-06, 07:17 AM   #10
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Quote:
Originally Posted by netorius77
I have already upgraded my existing RD to a XT Deore M-750 which works pretty well except when the chain is at the opposite extreme gears (sorry I can't think of the correct technical term) where the chain does rub a bit. My LBS reckons this will go away as it wears in, and I don't often ride in this configuration anyway.
It's called "cross chaining" and should be avoided. It's very hard on the chain and completely unnecessary as you can get the same gear ratio by choosing a more suitable cog/chainring combination. I'm very surprised your LBS didn't tell you to stay away from that configuration. The parts won't "wear in", they'll wear out.
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