I've turned my rigid SIR9 into a gravel grinder. I've just set up 24mm internal width rims with Ikon 2.0's front & rear. (tubeless)
Thoughts? They've been fine so far over 50kms. I used to run 2.2 Ikons quite routinely for XC stuff. I figured dropping 200g for the gravel grinder would be a good move.