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They are 19mm internal and 25mm external.
There is only clearance for a 23mm tyre up front and I want to use it for winter training on mixed surfaces, so the only way of getting more comfort was with wider rims, but I might be pushing it.
However, xm119 rim is wider than archetype and costs one fifth of it, so it's a cheap experiment and it doesn't matter if the rims get a bit scratched up :)
For now they're amazingly comfy and roll great with low pressure
Thanks. I'm looking forward to learn whether 23/24mm tyre combo on 25mm rims is a bad idea for the sidewalls. The comfort is amazing on gravel though :)