If you're talking about a lock-out on the rear shock don't bother. I never use mine anyway, and it's not something that makes much of a difference. And unless your fork has more than 4" travel a lock-out there isn't really all that necessary either. I can't say anything about the Fuel. I like the Liquid okay, but it's kinda heavy. Another nice cheap FS bike is the Marin Riftzone.