• permanently joined together

    It's not too taxing to drill the head off the rivet... Depends how much you want it!

    Making a 9-speed 13-34 would be easy

    Except you would need a 13T designed for a lockring (along with a lockring large enough). Apparently not.

  • It's not too taxing to drill the head off the rivet...

    That's the easy bit. You then have to rivet the 30 back on and rebate the spider to bring the stack down to the desired width.

  • You then have to rivet the 30 back on

    Why? It's just done for convenience - the lower level cassettes are just stacked up sprockets with plastic spacers. If it's on an alloy carrier then yes, it's a totally different ballgame but I don't believe the HG-500 is... (crosses fingers, hopes he's right)

    edit: this youtube video
    shows the reverse side of a cs-hg500-10 11-34

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