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There's this kind of thing but it's not compatible with my JetFluid Pro. I'm sure when I had a look, the only way to fit a bigger bike in was to somehow disassemble the clamp and fit a replacement - which doesn't seem to exist. Anyway, it's not drama as I use my Shiv in this for warming up at races only.
https://www.amazon.com/CycleOps-Trainer-Adapter-148X12mm-142X12mm/dp/B00KSCZQZE
How much do you want for your Fluid2? I'll pass on the details to my mate.
How does that work though if the turbo unit isn't wide enough for the 142mm arse end of the bike? I need to have a closer look at my turbo to see if that would work but I'm pretty sure I looked into adapters before I got my KICKR. Mine's a JetFluid though so maybe different clamp?