There was a picture of the first generation ibis tranny that did this. I think I saw it on bikeco’s page. Not sure how it was done though but you might give them a call.

 

You can't "bore out" a carbon headtube. That will definitely compromise the frame. However, there are some very clever carbon repairers that might be able to help/advise you. I would check with them first.

 

Thank you TX, this is what I was hoping to find. I hope it using the same headtube.

Rhialto, I won't touch the carbon itself, that would definitely compromise the structural integrity of the frame. I am considering reaming out 3mm to make the 41mm ID insert large enough for an adapter like Cane Creek EC44 to fit. This should allow me to use the tapered fork.
It's just 3mm that's preventing this from happening and as long as the metal inserts thickness isn't essential for keeping the headtube from cracking, this should be fine.

This is what I am trying to find out. I need to know the wall thickness of the inserts (head tube cups) that are glued into the frame. This information will help me determine whether this is feasible or not.

If anyone can help with this, I will appreciate it.

 

I can confirm that the 1st gen Tranny that BikeCo modded has the exact same headtube specifications as the 1st gen Mojo Carbon, so this has been done before.

Considering the limited nature of quality 140mm forks with straight 1 1/8" steerers, I'm surprised more people haven't done it.

The wall thickness of the bearing cup is 1.85mm with an inner diameter of 41mm. After reaming the existing bearing cup to 43.95mm to allow for a ZS44 spec bottom headtube cup, there will still be 0.375 of original alumnimum bearing cup and glue. If the new headtube cup is glued in, it should retain the structural integrity, even if the original bearing cup adds to the structural integrity of the headtube.

I understand the concern for safety, but I don't understand why people are so opposed to this particular modification. It's not like I'm hacking the frame up.

 

I ended up getting a 1-1/8" fork, though it would be nice to be able to run the pike fork. Now I need to sell it... Anyone want a like new Pike fork with tapered steerer?...