Guess who's building an odd MTB? You will have to state whether you're looking for a 26" or 29" one, not that I have.
I used to work on those things but I've never given it any thought to turn a 29" into a 26" one. The fashion completely went the other way - bigger.Thanks, forgot, 26 wanted, I have read that you can a turn 26 lefty to a 29 by adding shims, not sure if it works the other way round. I have a Cannondale frame with I,5 headset so no adapters needed.