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I did one from OTP parts
Iād like to do this with a 15mm hub if possible.. what parts should I be looking for?
MCamb-
what parts should I be looking for?
Ones which don't exist š
There are plenty of 15Ć100 to 9Ć100 converters available because people wanted to put new wheels in common old forks. Your problem is that 9Ć110 is not common, yours is the first one I've come across. Boost hubs were designed to go in through-axle forks, and there were no legacy forks they'd go into even if there was a conversion axle since the disc line is not the same as old 9Ć100 and 20Ć110 hubs. All the 9mm through axles which might be the starting point for an alternative to a skinny 5mm skewer have the same problem as the skewers, they are designed for 100mm OLN hubs and will be too short for you. I have one in my bag of axle spares, and the maximum it could cover is 116mm over the outside of the fork ends.
In principle, the conversion kit I used was a tube, a length of studding and two track nuts. The last of these you can easily buy, but M9Ć1.0 studding is not anybody's idea of a stock item and again M9 front track hub axles are designed for 100mm OLN and won't stretch the extra 10mm.
You can buy M9Ć1.0 screws, so the bare minimum custom solution is a 14.9Ć109.5 rod with M9 female threads in each end, or the same with M9 male extensions each end to accept OTP track nuts.
gbj_tester
The stock hub is Joytech, presumably an OEM custom job specifically for that bike since by 2018 it was already well known to everybody else that QR hubs and disc brakes are a bad combination. Good luck getting a spare for that š
As a dismal kludge while you're waiting for a new bike, or at least fork, you can trim and rethread a rear QR. If I were lumbered with that fork and a 15Ć110 hub I had to fix to it securely, I'd make an axle adapter with nuts or bolts. I did one from OTP parts to put a 20Ć110 hub into the 9Ć100 Pompetamine fork, but your use case is probably going to need custom parts as it's such an improbable starting point.