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gbj_tester
frankenbike
Could one machine a thingy that presses into a normal 1 1/8" headtube (34mm) which widens to 44mm for a 1 1/2" adapter headset thing at the bottom? Would it adversely affect the lifetime or operation of the headset somehow?
How long would it have to be? There doesn't seem to be a standard taper. There are some forks like this that it seems you could probably bodge in:
And others like this that would be difficult:
Probably one for @mdcc_tester
Edit: 30s diagram attached
Edit: obviously you've effectively increased the axle-to-crown a little bit. Not overly concerning to me personally.