I know there are many threads about this, and much information on google. But can't seem to get this right.

Basically, just a couple of questions.

With the wheels locked, how much play should there be in the pedals/crank? None?

And when people say there should be 1/2 inch of slack, is this 1/2 inch total movement, or just in 1 direction?

I got a new chain and it just doesn't feel right. I know part (or most) is the new chain and that is why it feels different, but it's really concerning me.

Thanks.