Chain length

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  • Chain length
  • rootes1
    Member

    how long is your chainstay? the length of this will make a difference to chain length..

    bikeneil
    Member

    As long as a piece of string…

    Impossible to say with out having the bike. Put chain on big cog and big chainring without running it through the rear mech and add two links.

    notnormal
    Member

    Hi, very rare I post, but a read an awful lot
    Great forum

    My question being – what chain length would be ideal for this setup :

    38t single front ring
    11-34t cassette
    Sram x0 medium cage rear
    Kmc ti chain

    It’s on my hard tail
    Mainly ride the red route at pines, Cannock ect….
    Like the faster down hill sections, but recently the chain keeps jumping off the front
    Run a hope top guide with a mesh bottom roller

    I’m looking for a definitive answer if poss

    Many thanks
    Tom

    gonzy
    Member

    Put chain on big cog and big chainring without running it through the rear mech and add two links.

    ^^ this long…

    Premier Icon scaredypants
    Subscriber

    chain jumping off a single ring with no front mech or other device to hold it on ? – not down to length IMO

    You prob should consider at least one of:

    chainring with variable width of teeth – or at least a SS chainring
    rear mech with a clutch doodah (maybe yours already has ?)
    retention device (or even just bashring one side and a keeper ring or jumpstop on the inside)

    notnormal
    Member

    Scaredypants chain jumping off a single ring with no front mech or other device to hold it on ? – not down to length IMO

    I run a hope chain device and a mesh bottom roller tensioner as posted in my original post

    Bikeneil – thank you for your response, I’ll try this setup tomorrow and compare how it is now

    Rootes1 – I will measure tomorrow…..thanks

    notnormal
    Member

    The hope chain device runs in conjunction with a hope bashring also

    Premier Icon theotherjonv
    Subscriber

    Can you post up a pic of the setup in the biggest gear at the back (largest cog, not highest gear). Let’s see the angle of your dangle, and we can then guess whether you can lose another pair of links.

    rootes1
    Member

    Rootes1 – I will measure tomorrow…..thanks

    no need was just trying to point out that despite you post other info you missed that is relevent.

    best as above Big- big plis 2 links (and that is is 2 full link so 2″ – before you cut check that the rear mech is ok in at both ends of the cassette and also don’t forget to allow for the quicklink

    notnormal
    Member

    Not the best picture

    Premier Icon theotherjonv
    Subscriber

    If that’s big cog at the back and a single ring front you can lose at least one pair of links (inner and outer) and maybe two pairs. Mine on the big cog has the mech cage fully extended forward

    Premier Icon scaredypants
    Subscriber

    I run a hope chain device and a mesh bottom roller tensioner as posted in my original post

    😳

    Still, if chain/ring is “secured” correctly at top & bottom it shouldn’t be possible to ship the chain from the front – should it ? Is the tension spring(s) OK in the mech ? Do you back-pedal a lot to rearrange your feet for corners ?

    (looks to me like you could get a couple of links out of that, but I don’t use SRAM mechs. What cog at the back do you use when descending ? if it’s a small one, your chain will still have slack in it)

    Definitely one full link if not two full links fewer would be better.

    notnormal
    Member

    Thank you for all the input, I’ve removed 3 links – it’s allot better
    I think I’ve found the route of my problem, my derailleur has become weak, the springs are soft all of a sudden, gonna swap it for anther sram xo if it arrives tomorrow

    Thanks once again
    Tom

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