Bicycles Asked by Boro Ortega on November 30, 2020
TLDR: Can I wedge an EC30 into what seems to be EC29 (29.8mm)
I’m in possession of a mid-90’s frame with a:
Its my understanding that this makes it a threadless EC29/25.4, which to my surprise is NOT sold virtually anywhere. EC30/25.4 on the other hand is easy to find
Am wondering -hoping- that the difference between the two is so negligible that manufacturers discontinued EC29 with the idea that people simply buy EC30
thoughts?
-b
It's unclear how it came to be a JIS (EC29) frame with threadless. That combination is odd. There are some different ways it might have been hacked together, or maybe some small number of bikes were made that way. It doesn't matter. Get the frame reamed to ISO/Campy/EC30 (all names for the same thing) and the crown milled if needed, and then you can install an obtainable new 1" threadless headset on it.
Some manufacturers of basic OEM and repair type headsets use the same cup profile for everything. Taking advantage of that is one way you could in theory combine two headsets to make a good hack solution. But it would be way easier to just machine the frame.
Jamming an EC30 headset in should not be done under any circumstances. The frame will be at risk for cracking now or later.
Correct answer by Nathan Knutson on November 30, 2020
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