Can I use Rockshox RS1 with Mavic 15X110? can I use a Rock Shox RS-1 suspension with Mavic Crossmax Pro Carbon boost 15X110 wheel?
The RS-1 is supposed to be used with a predictive steering hub, which has special teeth to engage with the fork - a standard boost hub will not have these.

You can see more details in this answer from zenbike:
https://bicycles.stackexchange.com/a/39048/14027