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Thread: 8spd Cranksets

  1. #1
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    8spd Cranksets

    Are 8speed Cranksets still out there? Im looking for a Shimano Deore XT crankset and they cant be found all they seem to have is 2x10, 3x10 and 3x9. This is also true for other companies as well (RaceFace, Sram, Truvative). Or is there some measurement or code that i am missing.

  2. #2
    Fat-tired Roadie
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    Cranksets from 7-9 speed are cross-compatible.

    I think there's a spacing change with cranksets for 10-speed drivetrains. I don't care to research it further.

    Dyna Sys 10 speed compatability with 9 speed (Shimano systems)
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  3. #3
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    thanks a lot. i got worried for a bit and thought i would have to do a complete overhaul

  4. #4
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    The spacing on 9 speed cranksets is a little narrower than on 7/8 speed cranksets. So it mostly works but there may be some chain rubbing issues in certain gear combinations that you wouldn't have with a 7/8 speed crankset. The best solution in this particular case is to use a 9 speed chain which will otherwise shift fine on an 8 speed cassette.

    Sugino still makes a very high quality cold forged and polished 8 speed crankset, in the older 110/74 five bolt pattern.

    http://www.amazon.com/Sugino-XD600-1.../dp/B001GSSE2Q

  5. #5
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    okay. the width of the 9 speed chain is narrower so than break it to 8 speed length

  6. #6
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    Quote Originally Posted by ZUUL99 View Post
    okay. the width of the 9 speed chain is narrower so than break it to 8 speed length
    The length should be the same for an 8 or 9 speed chain. 9 speed cogs and chainrings are the same width as 8 speed, just spaced closer together. So a 9 speed chain has the same internal width as an 8 speed chain, it is just narrower externally due to thinner side plates and tighter tolerances.

  7. #7
    JmZ
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    Running 8 and 9 speed cranksets on my bikes.

    All are 8 speed setups. The worst I've had to do was (marginally) bend a front mech out a hair to make the shifting perfect.

    Use a 9 speed crank and don't worry.
    JmZ

    From one flat land to another.

    Advocate as if your ride depends on it...

  8. #8
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    I just installed a Shimano LX crankset from Cambria for my aging 3 x 8 drivetrain. They are only $89 with included BB and maybe 1oz. heavier than SLX.


    -F

  9. #9
    Hi.
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    AndrwSwitch and mtnbiker72 both hit it, but they didn't mention front derailleur cage width. My take:

    1. An 8 speed chain is wider than a 9 speed
    2. An 8 speed crankset may have wider chainring spacing than a 9 speed, due to #1.
    3. An 8 speed front derailleur may have wider cage spacing than a 9 speed, due to #1.

    The front derailleur cage issue is not usually a problem. If you do decide to get a 9 speed crankset, just make sure you also pick up a 9 speed chain. Everything else should work fine with a little tweaking.

    My current setup:

    - 8 speed cassette
    - 9 speed chain
    - 8 speed FD
    - 9 speed crankset

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