My aging hybrid 700 35 tire was bulging off the rim and needed changing so I plumped for a thinner one, ordering a continental 28c, from halfords. It arrived with a new tube (decent bundle price) very quickly. I was surprised how skinny it was but the continental packaging said 700 28c so I didn't think too much about it. So I put it on today and it sure was skinny, just like my road bike me thought. Then when I got to pumping I double checked the recommended pressure on the side wall and saw it said 700 23c. That will explain why it is so skinny. Anyway, it rides OK (for a 2 minute test), and seems to sit on the rim OK. My question is will it be OK, out might it pop of the rim with lateral stress? I fancy keeping it but I don't fancy it causing me to go down. Any advice would be most welcome.