Had the chain all measured out, cut it and reassembled....but it still looked too long, even with the wheel pulled all the way back in the dropouts. So....I cut another link....now it's too short. I don't get it. How is tension measured? With the originally cut chain, the tension looked fine if I rotated the rear tire backwards, but as soon as the wheel rolled forward, the top chain would go slack and rest onto the bottom chain. (can't post a pic cause I already cut the chain again). Hope this makes sense......if not I will try and explain better. Thanks in advance.