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  1. #1
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    Tapered fork in 1st gen Ibis Mojo Carbon Frame (IS41 Headset)

    I have a Tapered fork that will work great with this frame. The Cane Creek adapter only seems to work for ZS44 (ZeroStack 44mm) headset and this frame has an IS41 (Integrated 41mm) headset.

    Questions:

    1. Is there any adapter that will work for this headtube?

    2. If not, would it compromise the integrity of the frame too much to bore the headtube out 3mm to fit the 44mm adapter? I believe it would only need to be bored on the bottom.

    3. Has anyone done this? If so, is there any documentation of it?

    Thank you in advance

  2. #2
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    I would not bore the frame. There is an adapter not sure if you can still find them.
    https://www.bikeradar.com/news/artic...d-tubes-25275/

    https://bikerumor.com/2010/05/20/new...-18-headtubes/
    Looking for a Medium Scott Scale frame, preferably a 2012 in 26.

  3. #3
    since 4/10/2009
    Reputation: Harold's Avatar
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    Quote Originally Posted by bridgestone14 View Post
    I would not bore the frame. There is an adapter not sure if you can still find them.
    https://www.bikeradar.com/news/artic...d-tubes-25275/

    https://bikerumor.com/2010/05/20/new...-18-headtubes/
    You didn't quite get what OP was saying. He was pretty clear about which sorts of headset standards he's dealing with. You missed the ball entirely on that.

    https://www.parktool.com/blog/repair...dset-standards

    Nomenclature of headsets has changed since those articles were written with the SHIS naming convention. Basically, what your links are talking about are EC44 headset cups and they're everywhere. Some manufacturers design their mtb's around their use with a straight 44mm head tube instead of using a tapered head tube and zs cups on both sides. OP has a bike that requires an IS41 headset. IME, these are most common on road bikes nowadays, but I do recall when they started making an appearance on mtb's. I am not aware of any plug-and-play adapter to fit a tapered fork into a frame that requires this kind of headset. OP already knows about EC44 cups and they won't work unless he bores out the frame to fit them. I personally wouldn't touch that option, but would probably talk to a frame builder about it to get a second opinion. I have a feeling that the OD on the head tube of a bike using a zs41 headset is a bit smaller than the OD of the head tube on a bike that uses a zs44 headset, though Park's link doesn't say. I looked at a few framebuilder supply shops, and they don't really specify the OD on most of their headtubes, but they definitely sell different ones for IS headsets or for EC/ZS headsets due to differences in the internal surfaces. Especially since the frame in the OP's question is carbon, I'm going to suspect that it's simply not possible to use a tapered fork.

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