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  1. #1
    Scooby Snax
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    8 who for 9 what?

    OK, I hope there is a simple answer for this question.

    I still have 8 speed drive train, mostly shimano STX-RC.
    In trying to lighten the load Ive bought new cranks and BB, Race Face Prodigy XC, and SRX.
    I checked with the LBS when I bought them, and they assure me that there is no problem using 9 speed front chainrings with 8 speed chain / rear cassette.

    However, Race Face's website makes some claim of incompatability.

    Ok who's blowin smoke up you know where....?

  2. #2
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    It's CYA. But, if you worry about it use a 9 speed chain.

  3. #3
    Mr. Cellophane RainmanP's Avatar
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    7, 8, and 9 speed chains are all the same inside width 3/32". The outer width narrows. The suggestion to use a 9sp chain is a good one if you experience any difficulty. Spacing of chainrings is less critical than rear cog spacing. For practical purposes there is little difference between "8-speed compatible" and "9-speed compatible". I am using 9sp STI shifters with older 6 or 7 sp cranks on two of my road bikes..
    If it ain't broke, mess with it anyway!

  4. #4
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    Contrary to what pokey said.

    I'd suggest sticking with an 8 - speed chain.

    If you swapped out the cranks (i.e. 3 front chainrings) and kept the 8 speed cassette, you need to stick w/ an 8 speed chain.

    The 9 speed chain is thinner and will not work well with an 8 speed cassette.

    An 8 speed chain (wider) will work with 9 speed chainrings. But will NOT work with a 9 speed cassette.

    I ran Shimano XT 8 speed with Race Face LP Turbine cranks and 9 speed rings w/o a problem.

    BTW what is SRX????? I may be completely off base since I don't know what SRX is, so, if I am sorry Pokey!

    L8R
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
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  5. #5
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    As i rethink it, his 8 speed STX deivetrain may be IG, which shimano says requires an 8 speed IG chain which has a width of 7.1mm which is narrower than the HG width of 7.4mm. Sram says their chains work with IG cassettes ,and the 9 sped is 6.9mm vs shimanos 9 speed width of 6.6mm.what's it all mean.I duno.

  6. #6
    Scooby Snax
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    Sory a2,

    SRX is the type of bottom bracket, the new one... just so there is no confusion.
    But I am using a SRAM chain, 8 sp, pc 68? damn if I dont forget!!

    Thanks, I think that Race face probobly are just covering any angle... It going on tomorrow...

    Next week, I ride like hell!!


  7. #7
    Mr. Cellophane RainmanP's Avatar
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    Originally posted by Scooby Snax

    But I am using a SRAM chain, 8 sp, pc 68? damn if I dont forget!!

    Next week, I ride like hell!!

    I ride like hell every week. But I keep trying to get better.

    FWIW, I called SRAM to ask about the difference between the different chain models when they came out with the PC-99 "racing" model. I don't race, but if it were functionally better in some way I would have been willing to pay a little extra for it. The SRAM tech said there is no functional difference between the different numbered models, just cosmetic and weight differences.
    PC-59 - has alternating black and silver links
    PC-69 - all silver
    PC-89 - does have heavier plate construction for heavy duty off-road use
    PC-99 - has drilled plates for slight weight reduction
    But the rolling/moving parts are basically identical.
    If it ain't broke, mess with it anyway!

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