10 speed, 9 speed, double, EUGH

Meatfox
Meatfox Posts: 155
edited May 2012 in MTB workshop & tech
if i have 10 speed casette, and want to convert to two chainrings up front, how much difference will using a 9 speed chainset actually make?

Comments

  • cooldad
    cooldad Posts: 32,599
    Not a lot
    I don't do smileys.

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  • delete_my_account
    delete_my_account Posts: 192
    10 speed chain on 9 speed chainrings isn't a great idea. !0 speed chains are narrower and so 10 speed chainrings are narrower. Using the 9 speed, wider chainrings with a narrow 10 speed chain could cause a whole lot of chain suck.
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  • cooldad
    cooldad Posts: 32,599
    Internal width of 8,9 and 10 speed chains is the same. Some they will work fine. The external width is different so you need to match with your cassette.
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  • delete_my_account
    delete_my_account Posts: 192
    If this is true, then why do companies spend money on making 9 and 10 speed chainrings? This would in fact make one of the chains work worse.
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  • cooldad
    cooldad Posts: 32,599
    It is true.
    I don't do smileys.

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  • Papa Ado
    Papa Ado Posts: 76
    Truth:
    8 speed internal width is 3/32"
    9,10,11 is 11/128"

    Not a huge deal but if you really care about performance, internal width and pin length does make a difference for pick up and drop on both front and rear. Pick ups on chain rings are a science.
    Pin lengths:
    8: 7.1, 7.3 (HG)
    9: 6.6
    10: 5.9
    11: 5.5
  • nicklouse
    nicklouse Posts: 50,675
    but what you guys forget is the width between the rings.

    but as yet i have not heard if this is changed by the ring thickness or the spider thickness and which maker does what.
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  • The Rookie
    The Rookie Posts: 27,812
    All the same internal width according to most sources
    http://en.wikipedia.org/wiki/Bicycle_chain
    http://www.sheldonbrown.com/gloss_ch.html
    Connex state their 9+ speed chains are 11/128th though.

    Still wouldn't make a 9 or 10 speed chainring any different though unless it's related to ring seperation, but then most people have never had an issue running 9 speed chains on 8 speed cranksets.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • Papa Ado
    Papa Ado Posts: 76
    Papa Ado wrote:
    Truth:
    8 speed internal width is 3/32"
    9,10,11 is 11/128"

    Not a huge deal but if you really care about performance, internal width and pin length does make a difference for pick up and drop on both front and rear. Pick ups on chain rings are a science.
    Pin lengths:
    8: 7.1, 7.3 (HG)
    9: 6.6
    10: 5.9
    11: 5.5

    This is fact for all chains. I work for KMC.

    "Internal width" of a chain does not refer to the actual distance between plates. It refers to the ability of the chain to accommodate certain gear teeth width. The internal spacing between a 9 and 10 speed chain in very noticeable. If you have both, take a look.

    The most important aspect is external spacing of the chain (somewhat shown by pin length) which must "fit" in gear spacing. As stated by cooldad earlier, best match your chain to your cassette.

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