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Old 07-13-09, 07:51 AM   #1
z415
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Shimano Acera RD-M340

Can it do 9 speed? The manual recommends 8s, but that is hardly concrete.

Trying to find the cheapest way to fix a bike.

Thanks.
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Old 07-13-09, 01:38 PM   #2
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New Posters - please READ THIS
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Old 07-13-09, 02:44 PM   #3
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I searched the forums - no dice.

I searched the Shimano tech docs - does not give a definitive no for 9s and I know their guidelines, such as max cog size for RDs, are not 100%. Admittedly, I could have missed it.

I was specific about the part and the question.

Subject line was fine IMO, written in a way in which it, hopefully, naturally selects those that would know the answer.

My LBSs had no clue and their suggestions was to try it, even though I noted that my 9s Shimano 2:1 shifters are about 138 miles away.

And for the most part, my usual BF grammar, punctuation, and semantics are good 'nuff.

Oh, I also searched for the product for sale to see if any seller/retailer had definitive information... best I remember, some said "7+ 8 speeds" so *bleh*

P.S. I wondered where you've been - haven't seen you around posting that link for a while - though I have been a bit MIA....

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Old 07-13-09, 03:27 PM   #4
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Your LBS' advice is the same as mine in regard to the specific question.

My post was referring to the fact that you didn't specify the type of bike or other components, and then enlarged the context to "Trying to find the cheapest way to fix a bike". Without that info no one can offer an alternative.
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Old 07-13-09, 03:52 PM   #5
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Your LBS' advice is the same as mine in regard to the specific question.

My post was referring to the fact that you didn't specify the type of bike or other components, and then enlarged the context to "Trying to find the cheapest way to fix a bike". Without that info no one can offer an alternative.
Type of bike or components shouldn't matter, but here goes.

I built up a Nashbar AL ATB frame for a friend with my old components from my Trek 3900, but was a bit lazy and cheap so it was 1x8 instead of 3x8. Shifter failed after spill. Rebuilt as 3x1. Rider needs more gears since she does off road and on road.

I am a long time user of 9s so I have cassettes and chains aplenty, along with a shifter (LX - maybe 2 gen. ago - its 138 miles away in Tampa so I can't give item #) that can do 9s.

Due to the fact that I have so many 9s drivetrain parts, it would be cheaper (or equal) to rebuild as 1x9 than 8s. Other option would be to buy a bolt kit for the extremely bolt-rounded X-7 RD I have and buy a SRAM SX-5 (?) 1:1 shifter to mate. Unfortunately, all my old 8s stuff has been donated to the local bike coop more than a year ago - just getting a 8s rear shifter would have been cheapest.

OR... I can succumb to my upgraditis and upgrade my drivetrain (full 1x9 SRAM X-7) to X-9, X-0, or even that new one (XX?) and trickle it down. Tempting, but I have expenses...
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Old 07-13-09, 06:21 PM   #6
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An 8 speed cassette is the same width as a 9 speed. An 11-34 range is nominally available in both. Indexing is handled by the shifter.

Therefore, of course the M340 will work for 9 speed - at least as well as it works for 8 speed.

The bigger question is how you're managing to find an Acera level RD for sale? Used parts pile? LBS take off?
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Old 07-13-09, 07:03 PM   #7
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An 8 speed cassette is the same width as a 9 speed. An 11-34 range is nominally available in both. Indexing is handled by the shifter.

Therefore, of course the M340 will work for 9 speed - at least as well as it works for 8 speed.

The bigger question is how you're managing to find an Acera level RD for sale? Used parts pile? LBS take off?
Ok, thanks for the confirm. I mentioned that I built up the bike with my spare parts - the Acera was one of the items - that wasn't clear.

Now all I need a new 9s shifter 2:1 and new cables and I'm set.
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Old 07-14-09, 09:52 AM   #8
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What type of shifter?
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Old 07-14-09, 01:14 PM   #9
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Whoops, I meant I need to get it:

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I am a long time user of 9s so I have cassettes and chains aplenty, along with a shifter (LX - maybe 2 gen. ago - its 138 miles away in Tampa so I can't give item #) that can do 9s.
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