I just got a new chain because my record ultra narrow chain got bent and I ruined it trying to break it and add some of the extra links I removed when I sized it for my bike. The guy at my local BS told me that you can't do that with the ultra narrow chains. He says that you size it, install it and ride it till it wears out or is damaged in which case it needs to be replaced. My problem is that I just got a new frame and I'm pretty sure that the distance between the crank and rear wheels is shorter. So, can the chain be shortened or do I need to buy another new chain to use on the new bike?