Yes, there is only one ring. I'm using the other to measure ring gap. It looks like I'm due for new rings. The feeler guage .508mm fits tightly between the ring. Shouldn't rings last for quite awhile? I'm not exactly sure how many miles this set has on them since my speedo hasn't worked for a while. If I were to guess I would say less than 4k. I will look at the part #'s used on the last rebuild. I know the cylinder is the A type. I'm running BelRay synthetic.