Saw your DM BigEls so though I’d answer your questions on here.
They are the 29er versions but I think you can get 27.5 versions. I’m running 2.4″ front and 2.25″ rear both Ardents, just cos they were fairly cheap and I wanted tan wall! They’re pretty wide so not sure about fitting on a diverge. I had some sks speed rockers on my London Road before this and they were really good running 40mm tyres.
They’ve been good in the wet muddy conditions, both front and back give good coverage. The rear is quite close to the tyre and does rub slightly on rough/rocky ground and chatter a bit but that’s because of the frame design. If you have a seat stay bridge it’ll secure better. I’ve got a plan to stiffen that bit up with an old spoke…..
The bridge that I’ve used on the front would also work well for a bridgeless rear end as well. It’s just cotics wishbone design that makes it difficult to fix. The bridge is also available separately for a tenner if you need a spare or need 2.
I’m really pleased with them though and would recommend.