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  1. #1
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    Shimano Acera 8 speed compatible with a 9 speed SLX rear Cassette?

    I have a Diamond back Response, which I bought a Mavic Cross ride wheel set that has a SLX 11-34 9 speed cassette. Current 8 speed cassette (Acera) is a 11-30 which the SLX is 11-30 in 8 of the 9 clogs. I really don't need the extra ring with 4 teeth. I was thinking on just using the 8 gears and ignoring the last ring. I am sure this has come across in the past but its a big forum to read it all
    All I want to do for now is use the shifter and brake levers for the the new disc Mechanical brakes and use the 8 speeds of the rear cassette. As I said the 4 extra teeth I do not need, if I need that I need that Ill need to find another hill to climb lol.

    So? Is it possible to use the Acera derailor with a SLX cassette? If so what possible problems I may have?

  2. #2
    Senior Member demoncyclist's Avatar
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    You will need to put the 8 speed cassette on the new wheel. The spacing between the cogs is different (9 cogs in the same space as 8), so it will not work correctly.
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  3. #3
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    Quote Originally Posted by DB Mike View Post
    ...So? Is it possible to use the Acera derailor with a SLX cassette? If so what possible problems I may have?
    If you don't have the tools to remove the cassettes have the bike shop swap the 8S cassette onto the new wheel.

    Brad

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    Won't work, need to put the 8 speed cassette on your new wheel. As pointed out, spacing is different. I imagine the shop would charge 5-10 dollars or so to swap the cassette.
    "When dealing with stuff like this consider that this is a bicycle, not a spaceship." -- FBinNY

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    Thanks, thats all I needed to know I am sure the tool will be around the same price

  6. #6
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    Quote Originally Posted by DB Mike View Post
    Thanks, thats all I needed to know I am sure the tool will be around the same price
    You need two tools; the correct model lockring tool and a chainwhip. A large adjustable wrench is needed to turn the lockring tool or you can clamp it in a bench vise with the wheel on top.

  7. #7
    Disco Infiltrator Darth Lefty's Avatar
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    The 9-speed cogs are closer spaced, so the shifter pulls less cable per click. You can do it by using the "Hubbub" cable routing on the rear derailleur. (I haven't tried it but I was looking at all this stuff for updating a classic bike with modern shifters.)

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    I ordered a cog remover tool and chainwhip just hope the acera cog set will fit on the SLX set

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    Quote Originally Posted by Darth Lefty View Post
    The 9-speed cogs are closer spaced, so the shifter pulls less cable per click. You can do it by using the "Hubbub" cable routing on the rear derailleur. (I haven't tried it but I was looking at all this stuff for updating a classic bike with modern shifters.)
    It's not the "Hubbub cable routing", it's the "Alternate cable routing" you want. The Hubbub routing decreases derailleur movement compared to cable pull, where the Alternate cable routing increases it.

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    Disco Infiltrator Darth Lefty's Avatar
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    Quote Originally Posted by cycle_maven View Post
    It's not the "Hubbub cable routing", it's the "Alternate cable routing" you want. The Hubbub routing decreases derailleur movement compared to cable pull, where the Alternate cable routing increases it.
    No, I got it right, you want to decrease the movement to make the 8-speed shifter work with 8 gears of the 9-speed cassette. The "alternate" which increases movement is for making old Dura-Ace work with the other systems.

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    Quote Originally Posted by DB Mike View Post
    I ordered a cog remover tool and chainwhip just hope the acera cog set will fit on the SLX set
    It will work, Shimano uses the same lockring throughout it's range, from 7 to 11 speeds.

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    Quote Originally Posted by Darth Lefty View Post
    No, I got it right, you want to decrease the movement to make the 8-speed shifter work with 8 gears of the 9-speed cassette. The "alternate" which increases movement is for making old Dura-Ace work with the other systems.
    Yep, you're right. I didn't read the original post carefully enough. I thought the OP had 9-speed shifters.

    The best option is to swap the 8-speed cassette to the new wheel, after all. I think the Hubbub routing isn't quite the right ratio for converting 8-speed shifters to 8-of-9 cassette.

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    Thanks all, when I looked at the cogs, I noticed it seamed tighter on the 9 speed cog over the 8 speed this is why I asked. Thanks for the info you all gave.

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    Quote Originally Posted by Darth Lefty View Post
    No, I got it right, you want to decrease the movement to make the 8-speed shifter work with 8 gears of the 9-speed cassette. The "alternate" which increases movement is for making old Dura-Ace work with the other systems.
    +1

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    FYI ....I did a test they do work together only difference is in the final high gear it skips a gear and goes into the 9th gear.

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    Quote Originally Posted by DB Mike View Post
    FYI ....I did a test they do work together only difference is in the final high gear it skips a gear and goes into the 9th gear.
    It'll work ...sort of. You can set the derailleur and chain to be aligned perfectly with any one cog on the cassette. Each shift away from that one aligned gear gets further and further out of whack. You'll probably have a few gears that work fairly smoothly and a few that work with a little chatter. Shift past those and it'll get progressively worse.

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    I do plan on changing the cassette to the 8 speed,when I get the right lock ring tool (hopefully any day now). Until than the 9 speed is working ok, yes it not working perfect but gets me where I am going with out major problems. Hopefully in the near future I can upgrade my rear derailer to the 9 speed.

  18. #18
    Senior Member Bill Kapaun's Avatar
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    Quote Originally Posted by DB Mike View Post
    I do plan on changing the cassette to the 8 speed,when I get the right lock ring tool (hopefully any day now). Until than the 9 speed is working ok, yes it not working perfect but gets me where I am going with out major problems. Hopefully in the near future I can upgrade my rear derailer to the 9 speed.
    It's your shifter that's not compatible.

  19. #19
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    Quote Originally Posted by Bill Kapaun View Post
    It's your shifter that's not compatible.
    So your saying its the shifter not the derailer thats the problem? Even if it is I still like to upgrade from Acera.

  20. #20
    Senior Member Bill Kapaun's Avatar
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    IF indexed shifting, the number of "speeds" on the shifter must match the number of "speeds" on the cassette.
    A 9 speed shifter pulls less cable per shift than an 8 than a 7...
    7 speed = 5mm cog spacing.
    8 speed = 4.8mm cog spacing.
    9 speed = 4.34mm cog spacing.

    The RDER doesn't know how many "speeds" it is. It just moves what the cable pull moves it.

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