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  1. #1
    <3s bikes Re-Cycle's Avatar
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    Having a hard time finding a suitable 1/8" cog to drill for disk mounting

    Recently bought a monocog and I would like to mount a fixed cog to the unused 6 bolt iso disk mount on the rear wheel for a fixed gear option. Boone makes an amazing Ti cog that does exactly this but the time to machine and cost are prohibitive. The instructions on www.63xc.com cite using a shimano DX cog. That and every other cassette cog or driver cog I can find are 3/32". So, where can I find a 1/8" cog suitable for drilling?



  2. #2
    Team Beer Cynikal's Avatar
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    Go to a LBS that sells BMX gear and ask for a cog. Shimano has 1/8 splined cogs for BMX and SS use.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  3. #3
    antisocialite dirtyphotons's Avatar
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    pm kogswell

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    shoot up or shut up. isotopesope's Avatar
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    a splined miche track cog might work as well.

  5. #5
    aspiring dirtbag commuter max-a-mill's Avatar
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    3/32nds will work fine till you find an appropriate one...

    somone who is handy with a drill should really make a whole bunch and start selling them.

    i'd be down for one!
    - the revolution will not be motorized -

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    <3s bikes Re-Cycle's Avatar
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    I think for now I'll use one of the spare cogs that came with the bike. I think the pack had 14,15,17,18. They just seem low quality is why I haven't gone for it yet.

  7. #7
    Senior Member p3ntuprage's Avatar
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    what about one of these?

    not sure where to get it though.

    fsnl
    sparky
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  8. #8
    Yup pyze-guy's Avatar
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    I've done a convertion that way. I used a cog from an old cassette I had and drilled it. The cog was tempered steel so I had to untemper it before I could drill though it by heating it up almost red hot and then dunking it in water. Drilled through no problem after that. Of course I had ruined 2 drill bits by then. The Boone cogs look awesome for this type of convertion. Too bad I stripped some of the threads on the hub trying this before. Should have spent a bit more time paying attention to bolting steel to aluminum. Good luck.
    When sadness fills my days
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  9. #9
    LF for the accentdeprived
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    Quote Originally Posted by Re-Cycle
    So, where can I find a 1/8" cog suitable for drilling?
    How about "anywhere"? Why couldn't you drill out any cog you can lay your hands on? You'll more than likely have to grind off the lip, and you probably can't use a 16T or smaller, cuz the bolt heads will contact the chain (What's the smallest cog anyone has successfully drilled yet?) Of course, if chainline requires a wider cog, it's different. BTW, I'm pretty sure you can get away with putting in a spacer if you need to.
    Quote Originally Posted by dutret
    Do you deny that you are clueless or do you just think that "moron" didn't need to be tacked on there?
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