I think I’m pretty settled on a medium, just debating colour choice now! Sure a small would be a lot of run at 4x and pump tracks but I do need to take it on long rides too so a medium it is.

Bike sizes are a funny thing though. Got a mate who’s pretty much the same dimensions as me. Both ride the same size road bikes set up very similarly, yet our MTB setup is very different. I pretty much always go for a size smaller.