Whipped mine out and the ringle moby I have in it doesn't have a size, so checked another few and found that the carbon richey one I have in my lapierre full suspension is a perfect fit,
I can’t remember what size mine is - I bought a modern Thomson layback the one with a funky bend to give me a bit more room not that that’s any help to anyone
When I get back I can pull it out and see what’s stamped on it