I have 31mm rims I think, currently on some relatively narrow 2.3s. What are you using in 2.5?
I’ve actually settled on 2.4 Advantages with EXO casing, as they come up big for a 2.4 on decent rims, weight about 800g and are a good combo of quick enough, and grippy enough in anything except proper slop.
Previously meddled with 2.5 Conti Diesels, 2.4 RQs, some big Bonty FR4 things (which are no longer made?), and some massive 2.7 inch rubber from Intense (insane grip but too heavy). I think I’ve got a big Spesh tyre somewhere too that was OK, Purg/Butcher maybe?
Did toy with the idea of getting some nice folding Dirt Wizards as liked them when I tried them on a friends bike, but the cost put me off, certainly would be nice if there were more options but tbh the decent 2.4 options are good enough in my eyes.