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ISCG 05 chain device?

7448stewart7448stewart Posts: 79
edited September 2014 in MTB buying advice
I have a Lappierre Zesty with a single chainring but want to fit a blackspire DER guide but I dont know what option to get as I dont know what ISCG is? also I want to fit a race face narrow wide chain ring but I dont know what bolt circle to get?

Any help please people cheers.


  • benpinnickbenpinnick Posts: 4,148
    On ISG05 the bottom left hole is lower than the bottom right, on ISG03 the bottom right is the lowest. Bolt circle will be crank dependent, but 95% of cranks are 104 on the outer/middle.

    A Flock of Birds
    + some other bikes.
  • that really helpfull mate cheers, do I just messure the bolt circle to find the right one?
  • benpinnickbenpinnick Posts: 4,148
    Yeah thats the easiest way
    A Flock of Birds
    + some other bikes.
  • Ok, so iv just received my iscg chain guide and from the diagram above doesn't seem to match the real thing, it looks like it should be the other way around. Any help here?
  • cooldadcooldad Posts: 32,599
    Looks fine to me. What does yours look like? BS_guideDER.jpg
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  • yeah sorted now, just me being stupid as usual lol cheers
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