11 speed road on vintage crankset

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  • 11 speed road on vintage crankset
  • joshvegas
    Member

    It’ll shift up from small to large chainring but when i drop it down again in the smallest cog at the back it dumps the chain onto the spider rather than the small chainring.

    Jump up the cogs at the back will pull it across enough and engage it fully again.

    Any ideas?

    Premier Icon scaredypants
    Subscriber

    do you mean it’s dropping between the 2 chainrings?
    If so, I imagine it’s the thinner chain buggering things up – esp if it’s a really old chainset
    How do the rings fit on? If there are spacers, could you grind/file them a bit to make the rings sit closer to each other?

    Or am I misunderstanding ?

    joshvegas
    Member

    Yeah I’m pretty confident its the chain width.

    No spacers unfortunately they just sit either side of the spider.

    Its a ballache

    Premier Icon scaredypants
    Subscriber

    would you be happy grinding down tabs on the spider?

    … why are you shfting to the smaller ring when you’re in the smalles rear cog?

    Premier Icon tonyg2003
    Subscriber

    Well something like a 8spd or 9spd chainset won’t work with an 11spd chain. You will get the chain dropping between the chain rings as you described. Time for a new chainset.

    joshvegas
    Member

    why are you shfting to the smaller ring when you’re in the smalles rear cog?

    Well its not something one does but it should work or you run the risk of binning it if you make mistake.

    So is an 11 speed chainset more closely spaced to compensate?

    joshvegas
    Member

    Update:

    One dremel one + one dremel router attachement + alot of measuring and one old chainring used as a testbed = one thinner chainring.

    Longevity might be an isdue but it shifts beautifully just now.

    Whatelse can i ghetto mill…

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