henrik wrote:may have to go with my b17.......
trouble is i'm hiring a carbon bike, would a b17 rails attach to any seat post?
I'm sure that the rails will attach. However, the B17 has relatively short rails and if the geometry of your hire bike is very different than your normal bike, this may give you difficulty. Also, if the hire bike requires a different position for your body (e.g. lower handle bars or smaller seat tube angle), the saddle may not be as comfortable.
That said, a saddle that you are used to, in a new position, is probably better than a saddle that you aren't used to. If your usual bike is similar or can try it on one that is beforehand, it will give you an idea whether it will work for you.
“In some ways, it is easier to be a dissident, for then one is without responsibility.”
― Nelson Mandela, Long Walk to Freedom