Black diamond like 5ft drops or just some chunky rocks? Pedals and droppers don't matter to me. Wheel strength? Proper psi and bigger tires help. So for me, XC is 4", trail is either 5" or 6 " of travel. I run an enduro with 6" of travel on chunky NE stuff. Its usually more of a skill level than a bike limit for tech and chunk, imho.