9 speed chainset - 8 speed cassette

Mettan
Mettan Posts: 2,103
edited January 2008 in Workshop
I've currently got 8-speed 2200 STI shifters and an 8 speed HG40 cassette on my roadie (with a 7/8 speed chain). I'm going to get a 9-speed Tiagra Hollowtech II 4550 50/34 compact chainset soon - question is, will the 9-speed chainset work with the existing 8-speed setup - the chainset seems to require a narrow 9-speed chain - do these narrow 9-speed chains work with 8 speed cassettes? - my particular cassette is the Shimano HG40 8 speed cassette.

Thanks

Comments

  • maddog 2
    maddog 2 Posts: 8,114
    yes the c/set will work

    and yes, a 9spd chain will work with a 8spd cassette
    Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer
  • Mettan
    Mettan Posts: 2,103
    Thanks Maddog - given that the Hollowtech II chainset has an integrated bottom bracket does it require anything else to fit it - some adverts seem to just mention the chainset whilst other adverts mention needing BB "cups" in addition to the chainset?
  • s_r_shaw
    s_r_shaw Posts: 3
    For Hollowtech, you'll need the bb cups, and if you don't have one, a tool to fit them. Hollowtech cranks have a built in axle, so dont work with standard bb's.

    I've been running dura ace 10 sp chainset succesfully with an old ultegra 8sp setup (using 8sp chain).
  • Mettan
    Mettan Posts: 2,103
    Thanks s_r - does anyone know if this is the correct tool to fit the BB cups:

    http://www.wiggle.co.uk/ProductDetail.a ... ket%20Tool

    "Bottom bracket wrench for use with Shimano hollowtech II and Truvativ GXP bottom brackets"

    It mentions being compatible with Hollowtech II - just double-checking before purchase - does the job require any other tools in addition to this?
  • gkerr4
    gkerr4 Posts: 3,408
    thats the bit and no you don't need any other tools - the hollowtech2 stuff is incredibly easy to fit.
  • Mettan
    Mettan Posts: 2,103
    Thanks mate - although it's often mentioned to get the shell faced in advance, is it worth atleast trying to see if the cups screw in "satisfactorily" first ?? - my Road bike's only 3 months old - I'm guessing the shell should be in reasonable shape still.

    Also, to confirm what my existing bottom bracket type is do I just have to unscrew the non-drive-side crank and have a look? - then get the correct tool to remove it?

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