Well, I just picked up a Bottlerocket frame and as an experiment I'm going to run it singlespeed using a Yess chain tensioner and my Bontrager big earl chankset. I'm not yet sure the BB spindle will be long enough to allow the use of the Transition chainguide so I may end up getting a new crankset anyway. But seeing as I'm running a FS bike SS with a spring loaded tensioner do you think a chainguide system will be necessary? I'm thinking it will be but I'm hoping not.