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Old 03-23-11, 12:30 PM   #1
cdell
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compatibility question

I had the following:
Front derailleur: SHIMANO DEORE FD-M510, Top Swing
Front shifter: SHIMANO Alivio SL-M410 Mega 8 Speed STI Rapidfire Pods
Rear Derailleur: SHIMANO DEORE SLX RDM-662SGS BLACK long cage (not rapidrise)
Rear shifter: SHIMANO Alivio SL-M410 Mega 8 Speed STI Rapidfire Pods


My front shifter broke, I bought a deore front shifter (Shimano Deore SL-M590 Left Shift Lever)


The LBS is telling me that they can't get it to shift into all three front chainrings. They're also saying that the front derailleur (the one that came with the bike) isnt' compatible with an 8 speed drivetrain (even though it worked perfectly when I got it).

Are they telling me the truth in any way, or should it be able to work?

More specs on the bike
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Old 03-23-11, 12:40 PM   #2
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I don't know that chainring spacing on 8s is any wider than on 9s so I can't imagine what the dealer is talking about.

What specifically is the problem? I'd ask for a detailed answer, or get second opinion.

BTW- If the shop sold you the shifter, it's up to them to make it work, or sell the correct one. If you bought it elsewhere understand that some mechanics are temperamentally not able to get things they shop didn't sell to work right.
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Old 03-24-11, 12:51 AM   #3
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That combo should work. They could have routed the cable wrong, but they should know the right way?
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Old 03-24-11, 01:48 AM   #4
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You could put any indexed-triple Shimano MTB front shifter, including the one you have, and it would work.

Only ways I can think of how to make it not work: Cable was installed too taught and there's too much tension to allow it to shift onto the inner chainring. Limit screw(s) too tight (though there was no reason to even touch these). Cable installed with shifter in the #2 or #3 position, so not enough tension to shift to outer chainring.

Even if the FD was not compatible with an 8-speed system, it doesn't explain why they can't get it to shift onto all the chainrings.

Honestly, it's an easy job. Maybe take this opportunity to learn how to do it yourself. http://www.parktool.com/blog/repair-...ur-adjustments
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Old 03-24-11, 03:25 AM   #5
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The front derailleur is technically supposed to be used with 9 speed parts according to the Shimano tech docs, but that should be a non-issue if the chainline is correct. Sounds like they are blowing smoke up your you know what. That front shift lever should be fine. It sounds like they might not know what they're doing.
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Old 03-24-11, 03:56 AM   #6
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that should all work just fine
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Old 03-24-11, 04:23 AM   #7
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Using a mech from any Shimano 8 or 9 groupset will work with any Shimano 8 or 9 speed shifter, think you need to find a new bike shop who know what they are doing.
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Old 03-24-11, 11:33 AM   #8
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To clarify, you should match the speed of the FD to the chain (so the FD cage width matches the outer width of the chain), for smoothest shifting. But, if they're all in the same family (indexed Shimano MTB) you would still be able to shift to all rings, no matter which FD you used.
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Old 03-24-11, 11:53 AM   #9
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+1,000,000

All the parts you listed should work together without a problem. It is likely if you picked it up and paid for the parts and some $$ for install (but should be less than the full set-up price as they were not able to do it) you can get it to work with some effort, a set of metric allen keys, and some reading on the interwebs.
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