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Old 04-01-09, 07:55 AM   #1
chemando
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Will my RD work with a different cassette?

Hi,

I currently have a Shimano 8 speed RSX rear deraullier, I believe the model is RD-A416.

I currently have a 11-23 cassette but want to change it to 11-32, 13-32 or 13-34. Will my current derailleur work with the new cassette?

Thanks.
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Old 04-01-09, 08:07 AM   #2
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It probably won't clear the 32T and almost certainly won't work with a 34T large cog.

Shimano rates their road rear derailleurs to work with a 27T maximum cog size and generally they will work with a 30T and sometimes, but rarely, a 32T. It depends on the derailleur hanger on the bike too. If you want to be sure to clear a 32 or 34T cog, you need an MTB rear derailleur.
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Old 04-01-09, 09:57 AM   #3
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Thanks!!!
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Old 04-02-09, 08:13 AM   #4
chemando
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Any recommendations on a good MTB derailleur to get? I use my bike for commuting, day rides and touring.

I would like a nice derailleur but don't want to spend the money for XTR if its not needed.
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Old 04-02-09, 09:09 AM   #5
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XTR is overkill. Any of the Shimano lower line MTB derailleurs will provide excellent service. I'd consider LX or, at most, XT.
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Old 04-03-09, 10:42 AM   #6
chemando
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Are rear derailleurs rated for different speed cassetes? ie, will a Deore LX rear work with a 8speed cassette without issues?
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Old 04-03-09, 12:37 PM   #7
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Quote:
Originally Posted by chemando View Post
Are rear derailleurs rated for different speed cassetes? ie, will a Deore LX rear work with a 8speed cassette without issues?
Yes. Within a given manufacturer's models, the number of "speeds" is determined by the shifter so any of their rear derailleurs will work with any shifter/cassette combination. The shifters, cassette and chain must match but the rd is suitable for use with any.

Required disclaimer: Shimano Dura Ace pre 9-speed shifters, etc, aren't compatible with older stuff but that isn't a issue for you.
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