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FTW!?! Brand new wheels, they've only been to the end of the High St. and back. Just bleed the brakes and was attaching the rear rotor to the hub. Turned the wheel over and the freehub, cassette and ratchet things all fell off!

How the actual 🤬 am I supposed to fix that...!?!
It’s common for wheels without threaded ends for this to happen, Hope do it too.
Put the ratchet rings & spring back in, push the freehub on and put on the end cap - simples.
In future don’t leave the cassette face down.
Freehubs are meant to come off, how else would you clean/change the ratchet/freehub?
I'd start by, well, putting it back on.
Wouldn’t worry about it.
DT Swiss ratchet freehubs do tend to come off fairly easily. Happened to me when I Dropped/leant one against the wall at an angle.
Just be mindful when it’s off the bike. Make sure it’s not picked up any dirt / grit and pop it back in correctly.
Wot they said.
Yep my DT swiss freehub fell off with cassette attached too a few weeks back, landed on my foot, bloody painful! 😠😠 Stuck it back on no probs.
As above just popt it back together, picture below to make sure the parts face the right way etc

Had some breakfast, took my daughter to stage school, then watched a video on the DT Swiss website. It went back together without any issues. I might have been calmer if there hadn't been so many small niggling problems with this bike build, hopefully we're all sorted for a shake down ride tomorrow.
@ta11pau1 I appreciate that freehub need to come off, but I don't think I'm being that out there by expecting them to stay on, unless your acctualy trying to take them off...
Thanks for the picture @bigyan that would've saved my watching a video...
Ive never had a DT freehub fall off but I have had the cassette fall off many times when using a one-up minidriver. There's no o-ring in the minidriver endcap to 'snap' things into place. Annoying as hell when your star ratchets end up in the grit.
Make sure you feel that positive snap/pop when you push the endcap onto the rear axle.