Im new at this and have a Pista. I noticed when I picked it up from the LBS the chain was what I would call "super tight", in other words moving it up or down at all took force, as if trying to stretch it to lift it up any more than 1/4 inch. How loose should it be? I noticed when the wheel is off the ground and I rotate the wheel the chain gets a bit tighter then looser as I rotate it, so I didnt think it should be real tight like it might be tough on the BB. Now I have it adjusted so if I lift up on the center section of the chain there is about 1/2 - 3/4 inch where its like Im just lifting the chain's own weight and not pulling against it. What's right here anyhow?